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Cardiac autonomic function was studied in 23 alcohol dependent men by standard tests of autonomic function and measurement of 24 hour heart rate variability. In all there was peripheral or central nervous system damage or both. Standard tests of autonomic function showed vagal neuropathy in seven. The remainder had normal autonomic function tests. Twenty four hour heart rate variability was measured as the standard deviation of the successive differences between RR intervals from an ambulatory electrocardiogram recording. Twenty four hour heart rate variability was significantly lower in both alcohol dependent groups than in controls, but the results in the two alcohol dependent groups were not significantly different from each other. The results of standard tests of autonomic function did not distinguish between the alcohol dependent men with normal autonomic function and controls. The differences in heart rate variability between this group and the controls may have been the result of the ...
TY - JOUR. T1 - Effect of posture on heart rate variability spectral measures in children and young adults with heart disease. AU - Vuksanovic, Vesna. AU - Gal, Vera. AU - Kalanj, Jasna. AU - Simeunovic, Slavko. PY - 2005/5/25. Y1 - 2005/5/25. N2 - BACKGROUND: Reduction of heart rate variability as a consequence of heart disease and postural change has been well documented. However, the data on the effect of postural change in pediatric patients are incomplete and the effect is not fully understood. The aim of the study was to investigate effect of postural change on heart rate variability in relation to the extent of severity of heart disease.METHODS: The dependence of heart rate variability on posture in 41 children and young adults (8-20 years) with heart disease has been investigated and compared with control. Short-term electrocardiograms (ECGs) were assessed in supine rest and active standing, and spectral measures of heart rate variability were determined.RESULTS: Two types of response to ...
TY - JOUR. T1 - Impaired Autonomic Nervous System in Alcoholics Assessed by Heart Rate Variation. AU - Yokoyama, Akira. AU - Takagi, Toshikazu. AU - Ishii, Hiromasa. AU - Muramatsu, Taro. AU - Akai, Junichiro. AU - Kato, Shinzo. AU - Hori, Shingo. AU - Maruyama, Katsuya. AU - Kono, Hiroaki. AU - Tsuchiya, Masaharu. PY - 1991/10. Y1 - 1991/10. N2 - The suppression of heart rate variation reflects cardiac autonomic nervous dysfunction and is known to be associated with a poor prognosis or sudden death in diabetic patients. We investigated consecutive changes in the heart rate variation in 51 alcoholics using the coefficient of variation of R‐R interval (CVRR). To correct for age effects, a ratio of CVRR to the standard predicted value (CVP) was calculated. On the whole, CVRR/CVP was suppressed on admission and on the 7th day of abstinence and increased on the 30th day. However, alcoholics could be divided into two groups by their CVRR/CVP on the 30th day: one group with transient autonomic ...
1. In patients with chronic heart failure, heart rate variability is reduced with relative preservation of very-low-frequency power (, 0.04 Hz). Heart rate variability has been measured without acceptable information on its stability and the optimal recording periods for enhancing this reproducibility.. 2. To this aim and to establish the optimal length of recording for the evaluation of the very-low-frequency power, we analysed 40, 20, 10 and 5 min ECG recordings obtained on two separate occasions in 16 patients with chronic heart failure. The repeatability coefficient and the variation coefficient were calculated for the heart rate variability parameters, in the time-domain (mean RR, SDRR and pNN50), and in the frequency-domain: very low frequency (, 0.04 Hz), low frequency (0.04-0.15 Hz), high frequency (0.15-0.40 Hz), total power (0-0.5 Hz).. 3. Mean RR remained virtually identical over time (variation coefficient 8%). The reproducibility of time-domain (variation coefficient 25-139%) and of ...
TY - JOUR. T1 - Autonomic Interactions in the Control of Heart Rate in the Monkey. AU - Gottlieb, Sheldon H.. AU - Engel, Bernard T.. PY - 1979/11. Y1 - 1979/11. N2 - Each of 5 monkeys (Macaca mulatta) was operantly conditioned to raise and to lower heart rate consistently and reliably. Following such training the animals were tested using autonomic blocking agents (methyl‐atropine bromide and 1‐propranolol) to characterize the autonomic mechanisms mediating such control. The results were: 1) In the undrugged animal the extent to which it decreases its heart rate over a 2048‐sec period is a linear function of the baseline heart rate; 2) A linear relationship between baseline heart rate and heart rate decrease also is present within the first 128 sec; 3) There is a less consistent relationship between baseline heart rate and change in heart rate when animals must increase heart rate; 4) Vagal blockade significantly attenuates the ability of most animals to increase heart rate, primarily by ...
resting heart rate. To calculate your heart rate reserve, you need to know your age (you should know this!), and your resting heart rate. Suppose your resting heart rate is 60 beats per minute (bpm). Your maximum heart rate is still calculated as 220 - your age ie 184bpm. But your heart rate reserve is now given as the difference between resting and maximum heart rate, or 184 - 60bpm = 124bpm.. If you work at 75% of your heart rate reserve, youll be training at 75% of 124bpm over and above your resting heart rate ie 93bpm above 60bpm, which is 153bpm. At 80% of heart rate reserve, its 80% of 124bpm over and above resting heart rate, which is 99bpm above 60bpm or 159bpm. Your 75-80% training zone therefore is 153bpm - 159bpm.. Although its slightly more complex to apply, the Karvonen formula more accurately reflects the working % of your maximum oxygen uptake than does a simple % of max heart rate calculation, particularly for fitter people. So for example, youre much more likely to be ...
Introduction. BMI and Heart Rate Investigation Question: How does Body Mass Index affect heart rate with respect to exercise? Null Hypothesis: Body Mass Index has no affect on heart rate with respect to exercise Alternate Hypothesis: If the Body Mass Index increases, then there will be a higher increase in heart rate with respect to exercise. Independent Variable: Body Mass Index (BMI) Dependent Variable: Percent increase of heart rate Constants: temperature, time of jumping jacks, BMI chart, time to count heart rate Control: Resting heart rate values Materials: stopwatch, 20 subjects, open space, calculator, Body Mass Index chart, Procedure: 1) Have subject derive their BMI with respect to their height and weight on the provided chart. Record value 2) Take subjects resting heart rate by counting their pulse for 10 seconds, and then multiplying by 6 for the 60 seconds in a minute. Record value 3) Using a stopwatch, have the subject do jumping jacks for exactly one minute 4) After jumping jacks, ...
TY - JOUR. T1 - Methodological comparisons of heart rate variability analysis in patients with type 2 diabetes and angiotensin converting enzyme polymorphism. AU - Marzbanrad, Faezeh. AU - Khandoker, Ahsan H.. AU - Hambly, Brett D.. AU - Ng, Ethan. AU - Tamayo, Michael. AU - Lu, Yaxin. AU - Matthews, Slade. AU - Karmakar, Chandan. AU - Palaniswami, Marimuthu. AU - Jelinek, Herbert F.. AU - McLachlan, Craig. N1 - Imported at 17:05 on 07 Apr 2017 (journal article sample for testing) - DigiTool details were: Journal title (773t) = IEEE Journal of Biomedical and Health Informatics. ISSNs: 2168-2194; PY - 2016/1. Y1 - 2016/1. N2 - Angiotensin converting enzyme (ACE) polymorphism has been shown to be important in hypertension progression and also in diabetes complications, especially associated with heart disease. Heart rate variability (HRV) is an established measure for classification of autonomic function regulating heart rate, based on the interbeat interval time series derived from a raw ECG ...
Residual heart rate variability measures can better differentiate patients with acute myocardial infarction from patients with patent coronary artery Jiunn-Song Jiang,1,2 Chew-Teng Kor,3 David Dar Kuo,4 Ching-Hsiung Lin,5,6 Chia-Chu Chang,7,8 Gau-Yang Chen,9,10 Cheng-Deng Kuo5,11 1Department of Internal Medicine, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan; 2Departments of Internal Medicine, Taipei Medical University School of Medicine, Taipei, Taiwan; 3Internal Medicine Research Center, Department of Research, Changhua Christian Hospital, Changhua, Taiwan; 4Architecture, Industrial Design Engineering, & Manufacturing Department, Mount San Antonio College, Walnut, CA, USA; 5Division of Chest Medicine, Department of Internal Medicine, Changhua Christian Hospital, Changhua, Taiwan; 6Department of Respiratory Care, College of Health Sciences, Chang Jung Christian University, Tainan, Taiwan; 7Division of Nephrology, Department of Internal Medicine, Changhua Christian Hospital, Changhua, Taiwan
Methods and Results-We conducted a multicenter retrospective observational study of women with congenital heart disease who had undergone cardiopulmonary exercise testing within 2 years of pregnancy or during the first trimester. Cardiopulmonary exercise testing variables included peak oxygen consumption and measures of chronotropic response: peak heart rate, percentage of maximum age predicted heart rate, heart rate reserve (peak heart rate−resting heart rate), and chronotropic index [(peak heart rate−resting heart rate)/(220−age−resting heart rate)]. We identified 89 pregnancies in 83 women. There were 4 spontaneous abortions and 1 termination. One or more adverse cardiac events occurred in 18%; congestive heart failure in 14%, and sustained arrhythmia in 7%. Peak heart rate (odds ratio [OR] 0.71; 95% confidence interval [CI] [0.53, 0.94]; P=0.02), percentage of maximum age predicted heart rate (OR 0.93; 95% CI [0.88, 0.98]; P=0.01), and chronotropic index (OR 0.65; 95% CI [0.47, ...
Rick Broida/CNET The fancy medical term for whats happening when you get winded walking up stairs is exertional intolerance. A resting heart rate of 110 is high but may not be abnormal for you depending on specific factors. Perceived exertion may not always be similar to your heart rate level, and it depends on the individual. There are several factors that affect your heart rate including your age, sex, weight, concomitant medical conditions, and fitness level. This should cause you to breathe more quickly with a modestly elevated heart rate but not prevent you from conversing easily. The heart rate readings seem accurate when I do aerobics. Tachycardia is a condition where the resting heart rate is faster than normal. Just not walking. Balavan Thomas October 19, 2020 at 3:48pm Hi, its best to continue jogging and walking. Signs and Symptoms Multiply your maximum heart rate reserve (the result from step two) by .85 (85 percent) and add that to your resting heart rate to find the upper limit ...
Your posture has an effect on your heart rate. Whats the Best Way to Boost Your Metabolism. It depends on whether you are standing up or lying down, moving around or sitting still, stressed or relaxed. If youve got any concerns about your overnight heart rate, you should check in with a doctor. When your heart rate is irregular. Max heart rate (MHR) is the highest number of beats per minute that your heart is capable of pumping, but dont expect to reach it! However, recent studies (hereand here) have suggested that an ideal resting heart rate is between 50-70 beats per minute. Heart rate can increase temporarily when you move from a sitting to a standing position; Smoking. A normal heart rate is generally stated to be between 60-100 beats per minute at rest(sitting, relaxing, etc.). First, you need to establish your max heart rate. Why? For example, a well-trained athlete might have a normal resting heart rate closer to 40 beats per minute. Our Steel HR hybrid smartwatch takes heart rate ...
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Question - Pain in the shoulders. Taken ampiclox, Ibex and panadol. Elevated heart rate. Need help. Ask a Doctor about diagnosis, treatment and medication for Thyroid disorder, Ask an Orthopaedic Surgeon
[During the recent wild NFL playoff game between the Saints and Vikings, some Apple Watch wearers saw elevated heart rate alerts.]
A rapid heart rate in cats is a heart rate greater than 220 bpm and is known as tachycardia. A cat with a rapid heart rate may have minimal symptoms, as a rapid heart rate is a symptom in itself and not the definition of a disease. - Wag! (formerly Vetary)
Autonomic nervous system plays an integral role in homeostasis. Autonomic modulation can frequently be altered in patients with cardiac disorders as well as in patients with other critical illnesses or injuries. Assessment of heart rate variability is based on analysis of consecutive normal R-R intervals and may provide quantitative information on the modulation of cardiac vagal and sympathetic nerve input. The hypothesis that depressed heart rate variability may occur over a broad range of illness and injury, and may inversely correlated with disease severity and outcome has been tested in various clinical settings over the last decade. This article reviews recent literature concerning the potential clinical implications and limitations of heart rate variability assessment in general medicine. ...
It is crucial to realize that by virtue of its very definition, the HRV encompasses only oscillatory phenomena between heart beats resulting from the SA node depolarization [4,10]. While, ideally, all components of an R-R series originate from the SA node, the actual R-R series in both healthy and diseased subjects are contaminated by outliers due to artifacts and heart rhythm disturbances such as ectopic beats (ie, heart beats whose origin is outside of the SA node). Thus arises the necessity to ensure that the HRV analysis is performed on a series representing only the actual normal sinus rhythm (NSR) interbeat intervals, commonly referred to as N-N series (as in normal-to-normal).. The detrimental impact of ectopics on HRV measures is pronounced and well-documented [6,11-17]. In a recent study Stapelberg et al [18] examined the sensitivity of 38 time domain, frequency domain and nonlinear HRV measures to the addition of artifacts in real and artificial 24-hour recordings. In accordance with ...
A new study conducted at the University of Tampere in Finland shows that the physiology of the infant has an impact on how strongly the mothers anxiety during pregnancy predicts the infants temperamental negative emotionality, such as crying, fussiness, and fearfulness. According to the study, the association between maternal anxiety during pregnancy and infant negative emotionality at eight months was strong in infants with high heart rate variability. No such association was detected among infants with lower heart rate variability.. Heart rate variability reflects the functioning of the autonomic nervous system, and recent research has linked high heart rate variability to greater susceptibility to various environmental influences. Research has also shown that the stress and anxiety experienced by the mother during pregnancy are associated with higher temperamental negative emotionality in infants.. The main contribution of this study is to point out that not all children are similarly ...
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Comprehensive Heart rate variability analysis (hrv) products provide full HRV analysis, health assessment , short-term HRV analysis, physiological monitoring, autonomic balance regulation analysis, stress management
Doctors give trusted, helpful answers on causes, diagnosis, symptoms, treatment, and more: Dr. Tuzcu on is it healthy to have a very slow heart rate: As the body needs more oxygen delivery, the heart rate increases. Exercise and overall good health make the body more efficient in use of that oxygen and thus less need for pumping fast. Of course slow heart rate can also occur with medications and other conduction system problems. A heart rate is too slow when symptoms occur. Consult your doctor.
HealthDay News) -- People with a slow heart rate dont have an increased risk for heart disease, a new study suggests.. A typical heart rate for an adult at rest is 60 to 100 beats a minute, but in some people its below 50 beats a minute, a condition called bradycardia, the researchers said.. Because the heart may not be pumping enough blood throughout the body, this slow heart rate can lead to light-headedness, shortness of breath, fainting or chest pain. However, it hasnt been clear whether a slow pulse increases the risk of heart disease, according to the study authors.. For a large majority of people with a heart rate in the 40s or 50s who have no symptoms, the prognosis is very good, corresponding author Dr. Ajay Dharod, instructor in internal medicine at Wake Forest Baptist Medical Center in Winston-Salem, N.C., said in a center news release.. Our results should be reassuring for those diagnosed with asymptomatic bradycardia, Dharod added.. In this study, researchers looked at data ...
A weak pulse and very slow heart rate are signs of a medical emergency and require urgent medical attention. In other words, bradycardia simply means a slower than usual heart rate. Follow us on social media. Syncope: which is otherwise known as the near-fainting or the fainting syndrome, Confusion, problems recalling events and eventual memory loss. Its important to get a prompt, accurate diagnosis and appropriate care. Your email address will not be published. This occurs mostly when the impulses that are produced in the atrium arent transmitted into the ventricles. A heart with a normal heart rhythm is shown on the left. They are seen to usually have bradycardia. Notify me of follow-up comments by email. What causes slow heart rate and is there anything I should ask my doctor. When symptomatic, it may cause fatigue, weakness, dizziness, sweating, and at very low rates, fainting. A number of conditions can cause signs and symptoms of bradycardia. A key risk factor for bradycardia is age. ...
Torrens ACT, ACT Australia 2673 You can check your heart rate any time using the Heart Rate app. Open the app, then wait for Apple Watch to measure your heart rate. You can also view your resting. Kurrajong Hills NSW, NSW Australia 2095 You can also set each heart rate zone and enter your resting heart rate manually. and enter your lactate threshold heart rate. You can perform a guided test to.. East Arm NT, NT Australia 0849 Your heart rate is an important number to know. How do you measure it? What should it be during exercise? WebMD has the answers... Upper Barron QLD, QLD Australia 4082 This manual is for the Forerunner ® 230 and 235 models. The heart rate features described in this section apply to both Forerunner models... Gawler South SA, SA Australia 5044 You can also set each heart rate zone and enter your resting heart rate manually. and enter your lactate threshold heart rate. You can perform a guided test to.. Ranga TAS, TAS Australia 7075 Measuring Heart Rate This means that the ...
We provide easy-to-use software solutions fulfilling highest scientific standards.. Our world famous Kubios HRV software is a scientific tool for heart rate variability (HRV) analysis. The software is suitable for clinical and public health researchers, professionals working on human or animal wellbeing, or sports enthusiasts; for anybody who want to perform detailed analyses on heart rate variability, e.g. to examine autonomic nervous system function.. ...
Women who have a high resting heart rate may be more at risk of suffering from a heart attack, according to new research.. Findings published online in the British Medical Journal reveal middle-aged female subjects with a resting heart rate of 76 beats per minute or more had a 26 percent greater chance of suffering a heart attack than those with a rate of 62 beats per minute or lower.. Lead author Dr. Judith Hsia told HealthDay News that heart rate is not as strong an indicator as high LDL cholesterol level, but is part of the overall picture of coronary health.. Previous research had found that men with higher resting heart rates were at greater risk of a heart attack, but until now studies on women had not produced statistically significant results.. Commenting on the results, Dr. Suzanne Steinbaum of Lenox Hill Hospital told the news provider that exercise is essential for lowering heart rate and improving health.. When you exercise, you increase the tone of the autonomic nervous system, ...
PURPOSE: Heart rate monitoring is widely used to measure physical activity in children, but it may be dependent on the definition of resting heart rate used and the protocol used to measure or derive resting heart rate (RHR). The aim of this study was to determine the effect of RHR definition on activity levels assessed by PAHR-25 (% time at ,25% of RHR), PAHR-50 (% time at ,50% of RHR), and activity heart rate (AHR; mean HR minus RHR). METHODS: Minute-to-minute heart rates were measured over 3 d in 20 healthy preschool children aged 3-4 yr. Resting heart rate was measured for 5 min after a 10-min rest and was also derived from the following different but commonly used protocols: 1) mean of lowest heart rate plus all heart rates within three beats; 2) mean of lowest 5; 3) lowest 10; 4) lowest 50. This gave five different definitions of RHR. Differences in RHR and in the derived indices of activity among definitions were tested for agreement using a Bland-Altman analysis, and by rank order ...
According to the American Heart Association, the average resting heart rate for adult men is between 60 and 80 beats per minute. The average heart rate varies for each person based on factors...
Biocom Technologies is a leader in design, development and manufacturing of software and sensors for assessing and improving health, fitness and professional performance. The market potential for our products spans the entire health, educational and fitness industry.. Biocom Technologies was formed by a team of biomedical researchers with expertise in the design and development of new software and sensor technologies for physiological data recording and heart rate variability analysis. The company is focused on developing new proprietary technologies and products for biomedical research, education and consumer health markets. Our core skills are in the development of new cutting edge software and hardware concepts.. Our primary focus is to ally with strategic partners and investors interested in new opportunities provided by booming consumer health and educational markets.. ...
Daily Exercise Can Increase The Slow Heart Rate/Yes, Bradycardia is defined as a resting heart rate below 60 beats per minute (b.p.m.). A slow heart rate
To illustrate the relationship between resting heart rate and baseline characteristics, we divided patients into groups by tertiles of heart rate. Tertiles were chosen according to the resting heart rate distribution at baseline. Each of these heart rate bands was centered round a multiple of 10, because we observed a substantial digit preference for investigator-reported heart rate. Differences in baseline characteristics across tertiles of baseline heart rate were assessed with a test for trend by means of variance weighted least square regression for continuous variables and with a nonparametric test for trend (18) for categorical variables in the overall CHARM population as well as in subgroups defined according to LVEF (i.e., reduced vs. preserved) and heart rhythm (presence or absence of AF). Kaplan-Meier survival analysis stratified according to tertiles of baseline heart rate for death from any cause and for the composite of cardiovascular death or hospital stay for worsening HF were ...
He knew that Qin Lang Quick had already hit his Soul Chasing Weight Loss Ziwu Nail just Quick Weight Loss Low Heart Rate now, Low and he should have almost lost his ability to move Heart Rate One palm is enough to send Qin Lang back to the west. In this article were looking at their popular fat burner supplement, but also in the Powher range, youll find a preworkout, a sleep supplement, and a nootropic You can stack any and all of them together depending on your lifestyle needs The Powher Fat Burner for Women is, unsurprisingly, tailored to female physiology. As for Quick the ransom sent by the empire, Weight it has been included Loss in Quick Weight Loss Low Heart Rate the treasury after being verified Quick Weight Loss Low Heart Rate by the Low treasurer, and the 100,000 Heart Shadow Army installed Lamer The transport ship Rate he brought with him left Mocdan with the empire general. The hospital where Ye Zhongjun lived, Quick the number of the ward, and even Weight the number of Quick Weight ...
Heart-rate training is hardly a new concept to endurance athletes. The usefulness of heart-rate data, however, has been questionable.. In the past, runners have ended their runs and stared at maximum and average heart rate values following a training session, not knowing exactly what to do with this information. Fortunately, the paradigm of heart-rate training has shifted in recent years, making it easier to understand what effort levels you should be running at for a given workout. Rather than focusing on one to two specific heart-rate values, zone training clumps values into five broader ranges, described below.. RELATED: Should I finish my workout?. Although metabolic testing isnt required to follow heart-rate based training, it is the most accurate way to determine your training zones as well as where you need the most work. If you cant spring for testing, you can estimate your values by finding out your max heart rate and using the following percentages determine your own training ...
{ consumer: Helps you calculate your target heart rate based on your age, resting heart rate, and activity level. Covers using your target heart rate to know how hard to exercise to gain the most aerobic benefit from your workout., clinical: Helps you calculate your target heart rate based on your age, resting heart rate, and activity level. Covers using your target heart rate to know how hard to exercise to gain the most aerobic benefit from your workout. } Solano County, California
The profound reduction in heart rate variability (HRV) that occurs during exercise is thought to be, at least in part, the result of sympathetic nervous system activation. Moxonidine is a centrally acting anti-sympathetic drug, which suppresses sympathetic nervous system outflow by stimulation of central imidazoline receptors located in the rostral ventro-lateral medulla. This study was designed to investigate the combined effects of central sympathetic inhibition with moxonidine and steady-state dynamic exercise on HRV. Ten normal males participated in a double-blind cross-over study, taking either placebo or 0·4 mg of moxonidine. The subjects were studied at rest and during steady-state exercise. HRV was measured considering both time and frequency domain parameters. As a non-linear measure, the Poincaré scatter-plot was measured and analysed quantitatively. Ventilation and gas exchange were also measured during exercise. In addition, plasma catecholamines were measured at rest and during ...
A multiparametric heart rate variability analysis was performed to prove if combined heart rate variability (HRV) measures of different domains improve the result of risk stratification in patients after myocardial infarction. In this study, standard time domain, frequency domain and non-linear dynamics measures of HRV assessment were applied to 572 survivors of acute myocardial infarction. Three parameter sets each consisting of 4 parameters were applied and compared with the standard measurement of global heart rate variability HRVi. Discriminant analysis technique and t-test were performed to separate the high risk groups from the survivors. The predictive value of this approach was evaluated with receiver operator (ROC) and positive predictive accuracy (PPA) curves. Results--The discriminant analysis shows a separation of patients suffered by all cause mortality in 80% (best single parameter 74%) and sudden arrhythmic death in 86% (73%). All parameters of set 1 show a high significant difference (p
Introduction: Patients (pts) with ischemic cardiomyopathy (ICM) may have impaired heart rate variability (HRV) which is associated with worse prognosis. We tested the hypothesis that cardiac mesenchymal stem cell (MSC) implantation is associated with improvement in HRV in patients with severe LV dysfunction and abnormal HRV at baseline. Methods: The POSEIDON Trial evaluated transendocardial MSC implantation in pts with ICM. We examined 24-48 hour ambulatory monitoring data from 25 pts at baseline, immediately post MSC implant, and intermittently up to 13 months following implantation. HRV was assessed using 3 parameters: (1) standard deviation of NN intervals (SDNN), (2) the square root of the mean squared differences of successive NN intervals (RMSSD), and (3) standard deviation of the average normal NN intervals (SDANN). HRV indices were correlated to changes in ejection fraction (EF), end systolic volumes (ESV), end diastolic volumes (EDV), and sphericity index (SI) using t-test.. Results: ...
Background: Epidemiological studies have suggested an association between external estimates of exposure to metals in air particles and altered heart rate variability (HRV). However, studies on the association between internal assessments of metals exposure and HRV are limited. Objectives: The purpose of this study was to examine the potential association between urinary metals and HRV among residents of an urban community in Wuhan, China. Methods: We performed a cross-sectional analysis of 23 urinary metals and 5-min HRV indices (SDNN, standard deviation of normal-to-normal intervals; r-MSSD, root mean square of successive differences in adjacent normal-to-normal intervals; LF, low frequency; HF, high frequency; TP, total power) using baseline data on 2,004 adult residents of Wuhan. Results: After adjusting for other metals, creatinine, and other covariates, natural log-transformed urine titanium concentration was positively associated with all HRV indices (all p , 0.05). Moreover, we estimated ...
Dear Doctors: My heart rate was 99 when I went for my physical recently, and my doctor said thats too high. I explained its usually about 80, but medical appointments make me nervous. Still, it got me to thinking: Whats a normal resting heart rate? How do I get it to be lower?. Dear Reader: Heart rate refers to how many times your heart beats each minute. Add in the word resting, and youre talking about a heart rate measured when someone is calm and relaxed. Along with blood pressure, an individuals resting heart rate is often considered to be a window on their general health. And, just so you know, its not that unusual for someones heart rate, along with their blood pressure, to become elevated in the sometimes-stressful setting of a medical office.. According to the American Heart Association, a resting heart rate that ranges from 60 to 100 beats per minute is normal for an adult. Factors such as age, gender, height, weight, physical fitness, lifestyle and general health each play a ...
TY - JOUR. T1 - Parasympathetic effects on heart rate recovery after exercise. AU - Kannankeril, Prince J.. AU - Le, Francis K.. AU - Kadish, Alan H.. AU - Goldberger, Jeffrey J.. PY - 2004/9. Y1 - 2004/9. N2 - Background: Exercise and its recovery period are associated with increased risk of death relative to sedentary periods. They are also accompanied by dynamic changes in autonomic tone. Little information is available regarding parasympathetic effects during high-intensity exercise and recovery. Methods: Ten normal subjects (five women; age 33 ± 2 years) underwent exercise testing on a bicycle ergometer. On day 1, subjects exercised to maximum tolerated workload using a graded protocol with 5 minutes at maximal workload (peak heart rate achieved 174.7 ± 5.4 bpm). On day 2, subjects performed the identical exercise protocol as on day 1; 1 minute into the maximum exercise stage, atropine (0.04 mg/kg) was administered. Heart rate was recorded every minute during exercise, and an ...
A growing body of literature has documented that job stress is associated with the development of cardiovascular disease. Nevertheless, the pathophysiological mechanism of this association remains unclear. The purpose of this study is to elucidate the relationship between job stress, heart rate variability, and metabolic syndrome. The study design was cross-sectional, and a total of 169 industrial workers were recruited. A structured-questionnaire was used to assess the general characteristics and job characteristics (work demand, decision latitude). Heart rate variability (HRV) was recorded using SA-2000 (medi-core), and was assessed by time-domain and by frequency-domain analyses. Time domain analysis was performed using SDNN (Standard Deviation of normal to normal interval), and spectral analysis using low-frequency (LF), high-frequency (HF), and total frequency power. Metabolic syndrome was defined on the basis of risk factors being clustered when three or more of the following cardiovascular risk
133bpm X 85% (High Intensity THR)= 113 bpm. 113bpm+54bpm =167 bpm. My Target Heart Rate Zone is 140bpm-167bpm. Target Heart Rate Zone. The Target Heart Rate zone is the desired range to reach during aerobic exercise and sets the stage for the heart and lungs to receive maximum benefit from exercise efforts. It is used during exercise to measure effort and to gauge the intensity of the workout. According to my Target Heart Rate Zone calculated above, an average heart rate of 135 bpm would be near the low end of the range and therefore be considered low intensity,. My average heart rate during that period of time, 135 bpm was approximately equivalent to a brisk walk. While I didnt feel as though I ran a 6 minute mile, I was slightly winded at the end of the 10 minutes. The 135 bpm that I averaged is close to the low end of my target range and is substantially more than my resting heart rate of 54 bpm. For the last 3 minutes of the practice, however, my heart rate continued to climb and ...
The Forerunner® device has a wrist-based heart rate monitor and is also compatible with ANT‍+® chest heart rate monitors. You can view wrist-based heart rate data on the heart rate widget. When both wrist-based heart rate and ANT‍+ heart rate data are available, your device uses the ANT‍+ heart rate data. ...
Keywords: Caffeine; heart rate variability; healthy volunteers. Introduction. The caffeine is one of the most widely used pharmacologically active substances. It has many different physiological effects on the cardiovascular function. Also the cardiac autonomic control could be altered by caffeine consumption. However, findings regarding the effect of caffeine consumption on cardiac autonomic nervous system (ANS) activity are controversial. The aim of the present study was to assess the effects of caffeine on cardiac ANS in young healthy subjects. Methods and Materials. In sixteen healthy volunteers (7 women), age 24-35, the electrocardiogram (ECG) was recorded continuously at rest before as well as 30 min and 60 min after caffeine ingestion (200 mg of caffeine in 50 ml of water). Before each the beginning of ECG registration the arterial blood pressure was measured. As assessment of cardiac ANS activity the power spectral analysis (autoregressive spectra) and the Poincaré plot analysis of the ...
Heart rate variability (HRV), the beat-to-beat variation in either heart rate or the duration of the R-R interval - the heart period, has become a popular clinical and investigational tool. The temporal fluctuations in heart rate exhibit a marked synchrony with respiration (increasing during inspiration and decreasing during expiration - the so called respiratory sinus arrhythmia, RSA) and are widely believed to reflect changes in cardiac autonomic regulation. Although the exact contributions of the parasympathetic and the sympathetic divisions of the autonomic nervous system to this variability are controversial and remain the subject of active investigation and debate, a number of time and frequency domain techniques have been developed to provide insight into cardiac autonomic regulation in both health and disease. It is the purpose of this essay to provide an historical overview of the evolution in the concept of heart rate variability. Briefly, pulse rate was first measured by ancient Greek
BACKGROUND--Although heart rate variability has already been studied in survivors of sudden cardiac death secondary to coronary artery disease, an assessment of heart rate variability in survivors of sudden cardiac death not associated with coronary artery disease has not been made. METHODS--10 patients with aborted sudden cardiac death not associated with coronary artery disease (seven patients with primary ventricular fibrillation and three with unclassified mild cardiomyopathy) underwent two channel 24 hour Holter monitoring in a drug free state. All subjects were in sinus rhythm and had normal atrioventricular conduction and normal cardiac function. Spectral heart rate variability was analysed on a Holter analysis system and was expressed as total (0.01-1.00 Hz), low (0.04-0.15 Hz) and high (0.15-0.40 Hz) frequency components for each hour. Heart rate variability index was calculated for the 24 hour periods. 10 age and sex matched healthy subjects were taken as a control group. RESULTS--The ...
We tested the hypothesis that a single allele deletion of neuronal nitric oxide synthase (nNOS) would impair the neural control of heart rate following physical training, and that this phenotype could be restored following targeted gene transfer of nNOS. Voluntary wheel-running (+EX) in heterozygous nNOS knockout mice (nNOS(+/-), +EX; n= 52; peak performance 9.1 +/- 1.8 km day(-1)) was undertaken and compared to wild-type mice (n= 38; 9.5 +/- 0.8 km day(-1)). In anaesthetized wild-type mice, exercise increased phenylephrine-induced bradycardia by 67% (measured as heart rate change, in beats per minute, divided by the change in arterial blood pressure, in mmHg) or pulse interval response to phenylephrine by 52% (measured as interbeat interval change, in milliseconds, divided by the change in blood pressure). Heart rate changes or interbeat interval changes in response to right vagal nerve stimulation were also enhanced by exercise in wild-type atria (P | 0.05), whereas both in vivo and in vitro responses
We tested the hypothesis that a single allele deletion of neuronal nitric oxide synthase (nNOS) would impair the neural control of heart rate following physical training, and that this phenotype could be restored following targeted gene transfer of nNOS. Voluntary wheel-running (+EX) in heterozygous nNOS knockout mice (nNOS(+/-), +EX; n= 52; peak performance 9.1 +/- 1.8 km day(-1)) was undertaken and compared to wild-type mice (n= 38; 9.5 +/- 0.8 km day(-1)). In anaesthetized wild-type mice, exercise increased phenylephrine-induced bradycardia by 67% (measured as heart rate change, in beats per minute, divided by the change in arterial blood pressure, in mmHg) or pulse interval response to phenylephrine by 52% (measured as interbeat interval change, in milliseconds, divided by the change in blood pressure). Heart rate changes or interbeat interval changes in response to right vagal nerve stimulation were also enhanced by exercise in wild-type atria (P | 0.05), whereas both in vivo and in vitro responses
TY - JOUR. T1 - Effect of β-blockade on the premature ventricular beats/heart rate relation and heart rate variability in patients with coronary heart disease and severe ventricular arrhythmias. AU - Acanfora, Domenico. AU - Pinna, Gian Domenico. AU - Gheorghiade, Mihai. AU - Trojano, Luigi. AU - Furgi, Giuseppe. AU - Maestri, Roberto. AU - Picone, Costantino. AU - Iannuzzi, Gian Luca. AU - Marciano, Fortunato. AU - Rengo, Franco. PY - 2000/8. Y1 - 2000/8. N2 - We examined the effects of β-blockers on the associations between heart rate and number of premature ventricular beats (PVBs) and on heart rate variability and myocardial ischemia in patients with coronary heart disease. After 2 weeks of run-in placebo treatment, 18 patients with coronary artery disease were randomized to a 7-day treatment with either propranolol (40 mg) three times a day or placebo. During run-in and after 7 days of treatment, patients underwent 24-hour Holter monitoring and exercise tests. We analyzed the 24-hour ...
Baseline heart rate variability (HRV) is linked to prospective cardiovascular health. We tested intensity and duration of weekly physical activity as predictors of heart rate variability in young adults. Time and frequency domain indices of HRV were calculated based on 5-min resting electrocardiograms collected from 82 undergraduate students. Hours per week of both moderate and vigorous activity were estimated using the International Physical Activity Questionnaire. In regression analyses, hours of vigorous physical activity, but not moderate activity, significantly predicted greater time domain and frequency domain indices of heart rate variability. Adjusted for weekly frequency, greater daily duration of vigorous activity failed to predict HRV indices. Future studies should test direct measurements of vigorous activity patterns as predictors of autonomic function in young adulthood.
and for each person 9. Upload results from heart rate monitors onto computer 10. Read graphs to figure out if heart rates went up For our project we decided to see if playing video games could affect a persons heart rate. We figured that playing certain video games would affect your heart rate more than others. We hypothesized that if we tested the games Mario Kart, Wii Sports Resort, and Call of Duty to see how much they would affect a persons heart rate, Call of Duty would affect a persons heart rate the most, Wii Sports Resort would cause the second highest percentage of heart rate increase, and Mario Kart would not produce much of an increase. Background Research: Video game consoles are in more than 80% of childrens bedrooms Calm games tended to not cause much of an increase in heart rate Active games (such as wii fit) tended to cause a 20% increase in heart rate Violent games tended to cause a 40% increase in heart rate Studies have shown that playing certain video games can have ...
TY - JOUR. T1 - Validity of standard deviation and maximum. T2 - Minimum ratio in quantifying cardiac autonomic function following acute unilateral brachial artery occlusion. AU - Sheila, R. P.. AU - Sheelajoice, P.. AU - Subbalakshmi, N. K.. AU - Hemalatha, H.. AU - Kishan, K.. PY - 2011/1/1. Y1 - 2011/1/1. N2 - Objective The clinical utility of analysis of heart rate variability is currently under research. We evaluated the validity of time domain measures of heart rate variability parameters in appraising the impact of acute unilateral brachial artery occlusion on cardiac autonomic control in healthy subjects. Methods In 11 healthy female volunteers aged between 20-25 years, R-R intervals and blood pressure were recorded for 30 s under resting condition and during occlusion of left brachial artery. Heart rate variability was quantified by time domain method. Mean differences in values of measured parameters were compared between resting and during brachial artery occlusion employing paired ...
STUDY OBJECTIVES: The study goal was to investigate autonomic activity with heart rate variability analysis during different sleep stages in males and females.. DESIGN: The study utilized a 2 Groups (males, females) x 4 States (waking, stage 2 sleep, stage 4 sleep, rapid-eye movement sleep) mixed design with one repeated, within-subjects factor (i.e., state).. SETTING: The study was carried out in the sleep laboratory of the Thomas N. Lynn Institute for Healthcare Research.. PARTICIPANTS: Twenty-four healthy adults (fourteen females and ten males).. INTERVENTIONS: NA.. MEASUREMENTS AND RESULTS: All participants underwent polysomnographic monitoring and electrocardiogram recordings during pre-sleep waking and one night of sleep. Fifteen-minute segments of beat-to-beat heart rate intervals during waking, stage 2 sleep, stage 4 sleep, and REM sleep were subjected to spectral analysis. Compared to NREM sleep, REM sleep was associated with decreased high frequency (HF) band power, and significantly ...
TY - JOUR. T1 - Assessment of cardiac autonomic function by post exercise heart rate recovery in diabetics. AU - Takkar, Nidhi. AU - Takkar, Jai Prakash. AU - Padmakumar, R.. AU - Patil, Navin A.. AU - Rao, Karthik N.. AU - Bhattacharje, Dipanjan. PY - 2017/12/1. Y1 - 2017/12/1. N2 - Background and Aims: Autonomic dysfunction in type 2 diabetes mellitus (DM) patients may translate into an increased cardiovascular morbidity and mortality. Autonomic system regulates heart rate recovery (HRR), an important predictor of cardiovascular mortality, which can be assessed using the exercise electrocardiogram (ECG). Hence, utilizing HRR, this study assessed the autonomic function of the cardiovascular system after one minute of exercise stress test in both, patients with and without type 2 DM. Materials and Methods: A prospective case control study involving 50 patients with type 2 DM and 50 without type 2 DM, matched for age and sex, was carried out. Each subject underwent an exercise stress test by ...
After that, they might experience vomiting, diarrhea, and an elevated heart rate for another couple of days. in the east, people used kratom to help kick their addiction to opium, and western scientists have been researching these effects for years. other signs of a kratom rate overdose may be similar to opioid overdoses, such as sedation, passing out, dissociation from reality, confusion, and a slow heart rate. if someone shows these signs of overdose, regardless of what drug is causing the overdose,. red vein kratom is generally useful at regulating brain activity, heart rate and other aspects of bodily functions. that s why it s able to relax the muscles and produce a sedating effect. it s perfect for anyone that struggles with sleep due to insomnia, parasomnia and other sleeping disorders. but taking too much kratom can cause some unintended health problems, including agitation, seizures, rapid heart rate and high blood pressure, spiller said. in extreme cases, kratom overdose can put a ...
Association between resting heart rate and N-terminal pro-brain natriuretic peptide in a community-based population study in Beijing Ruihua Cao, Yongyi Bai, Ruyi Xu, Ping Ye Department of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, People’s Republic of China Background: N-terminal pro-brain natriuretic peptide (NT-proBNP) is associated with an increased risk of cardiac insufficiency, which possibly leads to heart failure. However, the relationship between resting heart rate and NT-proBNP is unclear.Objective: This study focuses on this relativity between resting heart rate and plasma NT-proBNP levels in a surveyed community-based population.Methods: We evaluated the relativity between resting heart rate and plasma levels of NT-proBNP in 1,567 participants (mean age 61.0 years, range 21–96 years) from a community-based population in Beijing, People’s Republic of China.Results: In patients with high resting heart rate (≥75 beats/min), NT-proBNP was higher than in
The objective was to determine the characteristics of heart rate variability and ventricular arrhythmias prior to the onset of ventricular tachycardia (VT) in patients with an implantable cardioverter defibrillator (ICD). Sixty-eight beat-to-beat time series from 13 patients with an ICD were analyzed to quantify heart rate variability and ventricular arrhythmias. The episodes of VT were classified in one of two groups depending on whether the sinus rate in the 1 min preceding the VT was greater or less than 90 beats per minute. In a subset of patients, increased heart rate and reduced heart rate variability was often observed up to 20 min prior to the VT. There was a non-significant trend to higher incidence of premature ventricular complexes (PVCs) before VT compared to control recordings. The patterns of the ventricular arrhythmias were highly heterogeneous among different patients and even within the same patient. Analysis of the changes of heart rate and heart rate variability may have predictive
Fingerprint Dive into the research topics of Effects of cardiac rehabilitation and beta-blocker therapy on heart rate variability after first acute myocardial infarction. Together they form a unique fingerprint. ...
Abstract: One of the most promising non-invasive markers of the activity of the autonomic nervous system is Heart Rate Variability (HRV). HRV analysis toolkits often provide spectral analysis techniques using the Fourier transform, which assumes that the heart rate series is stationary. To overcome this issue, the Short Time Fourier Transform is often used (STFT). However, the wavelet transform is thought to be a more suitable tool for analyzing non-stationary signals than the STFT. Given the lack of support for wavelet-based analysis in HRV toolkits, such analysis must be implemented by the researcher. This has made this technique underutilized. This paper presents a new algorithm to perform HRV power spectrum analysis based on the Maximal Overlap Discrete Wavelet Packet Transform (MODWPT). The algorithm calculates the power in any spectral band with a given tolerance for the bands boundaries. The MODWPT decomposition tree is pruned to avoid calculating unnecessary wavelet coefficients, ...
Percutaneous coronary intervention (PCI) is a common treatment method for patients with coronary artery disease (CAD), but its effect on synchronously measured heart rate variability (HRV) and pulse transit time variability (PTTV) have not been well established. This study aimed to verify whether PCI for CAD patients affects both HRV and PTTV parameters. Sixteen CAD patients were enrolled. Two five-minute ECG and finger photoplethysmography (PPG) signals were recorded, one within 24 h before PCI and another within 24 h after PCI. The changes of RR and pulse transit time (PTT) intervals due to the PCI procedure were first compared. Then, HRV and PTTV were evaluated by a standard short-term time-domain variability index of standard deviation of time series (SDTS) and our previously developed entropy-based index of fuzzy measure entropy (FuzzyMEn). To test the effect of different time series length on HRV and PTTV results, we segmented the RR and PTT time series using four time windows of 200, 100, 50 and
TY - JOUR. T1 - Effect of position on the residual heart rate variability in patients after orthotopic heart transplantation. AU - Lin, Yi Ying. AU - Lu, Wan An. AU - Hsieh, Yuan Chen. AU - Chang, Hsiao Huang. AU - Shih, Chun Che. AU - Jeng, Mei Jy. AU - Kuo, Cheng Deng. PY - 2017/2/1. Y1 - 2017/2/1. N2 - Background This study investigated the effects of position on heart rate variability (HRV) in patients some years after orthotopic heart transplantation (OHT) surgery. Methods Spectral HRV analysis was performed on 15 patients after OHT and 16 patients with coronary artery disease (CAD). HRV measures were compared between OHT and CAD patients in four randomly ordered positions [supine, right lateral decubitus (RLD), left lateral decubitus (LLD), and upright]. Multivariable linear regression analysis was used to identify the factors associated with cardiac function and HRV of OHT patients in supine position, and the factors associated with the outcome (OHT or CAD) of the patients. Results The ...
The importance of counterregulatory mechanisms triggered by arterial vasodilation for the antihypertensive response to the calcium entry blocking agent nifedipine was investigated in 13 men with mild to moderate essential hypertension. Blood pressure and systemic vascular resistance were significantly reduced 30 minutes after sublingual administration of 10 mg of nifedipine while heart rate, cardiac index and plasma norepinephrine concentrations increased (all p , 0.01). Also, changes in mean blood pressure correlated inversely with arterial baroreflex sensitivity (r = -0.74, p , 0.01), suggesting that arterial baroreflex mechanisms by means of sympathetic activation tend to limit the acute antihypertensive response. Blood pressure, but not systemic vascular resistance, decreased further (p , 0.01) after 6 weeks of therapy with nifedipine 20 mg three times daily, while average heart rate, cardiac index and plasma norepinephrine concentrations had returned toward pretreatment values.. Thus, a ...
ECG recordings, especially during an exercise stress test, are exposed to artifacts. The source of artifacts can be due to technical problems, biological events and errors in the automatic detection. As a result missed beats, extra beats and ectopic beats can occur. In this study analysis of missed beats is performed using time-frequency analysis. Some of the patients data had missed beats. Fourier spectral analysis was first applied to the missed beats during the resting state. The impact of missed beats using Fourier spectral analysis is significant, especially, when the missed beats are in a row. The Fourier spectral analysis does not appropriately represent heart rate variability (HRV) during and after exercise because it assumes a signal to be stationary. In addition, Fourier analysis provides information of the heart rate only in the frequency domain. Therefore, there was a need to apply time-frequency analysis to examine the effect of missed beats. For the purpose of analysis, beats were
Measurements of the distance a labeled particle of blood travels back up the descending aorta during a single diastole have been carried out at two different heart rates in each of three patients with aortic insufficiency. From these measurements, the ratios of back flow per unit time at the slow heart rate to backflow at the faster heart rate were found to be 1.61, 1.71, and 1.75. From an analysis of the hemodynamic factors involved, it seems likely that backflow is overestimated at the slow heart rates by this technique due to the development of laminar flow late in diastole.. ...
TY - JOUR. T1 - Intracoronary epinephrine attenuates baroreflex control of heart rate in the conscious dog. AU - Holmberg, M. J.. AU - Gorman, A. J.. AU - Cornish, K. G.. AU - Zucker, I. H.. PY - 1984. Y1 - 1984. N2 - In the present study, the reflex effects of low-dose (12.5-50 ng·kg-1·min-1) intracoronary epinephrine infusion on the arterial baroreflex control of heart rate were studied. Mean arterial blood pressure-heart rate curves were constructed by changing mean arterial blood pressure with graded occlusions of the descending aorta and inferior vena cava. Intracoronary epinephrine increased left ventricular dP/dt(max) by an average of 309 ± 67.0 mmHg/s but did not alter resting mean arterial blood pressure or heart rate. Peak sensitivity, the maximum absolute slope along the mean arterial blood pressure-heart rate curve, and heart rate range were 32.7 ± 3.2 and 26.7 ± 2.5% less during intracoronary epinephrine compared with control, respectively. Intracoronary epinephrine did not ...
The high-frequency spectral component of heart rate variability and SD1 analyzed from Poincaré plots have been previously shown to reflect the cardiac vagal outflow (29-31). Both high-frequency oscillations of heart rate and short-term heart rate oscillations (SD1) measured from return plots are almost absent after vagal blockade (30,31). The latter index (SD1) was used in this study in addition to spectral analysis because it is less sensitive to trends in heart rate itself when compared with analysis of the high-frequency power spectral component (26). The increase of heart rate itself, regardless of its origin, may also result in a reduction of these heart rate variability indexes. However, in the present study, the increase of heart rate and the decrease of high-frequency power and SD1 were not related to an increase of epinephrine or norepinephrine, suggesting that adrenomedullary sympathoexcitation was not the primary cause of altered heart rate variability, but that these changes were ...
Recent interest in autonomic nervous system dysfunction and its effect on mortality from cardiac events has led to power spectrum ECG measurements. There seems to be a significant relationship between decreased heart rate variability and mortality in ECGs recorded from patients following myocardial infarction. Further autonomic nervous system activity in patients can be evaluated by spectral frequency analysis of the ECG. This analysis is divided into ultra low, very low, low, and high frequencies. Such analysis demonstrates a marked decrease in variability in all four frequency categories in postmyocardial infarct patients. It is postulated that high-frequency power and heart rate variability are modulated by the parasympathetic nervous system, whereas low-frequency power is modulated by both the sympathetic and parasympathetic systems. This effect appears to last for at least 12 months following infarction. The recovery of normal heart rate variability and the declining rate of mortality ...
TY - JOUR. T1 - Heart rate variability in preterm infants and maternal smoking during pregnancy. AU - Thiriez, Gérard. AU - Bouhaddi, Malika. AU - Mourot, Laurent. AU - Nobili, François. AU - Fortrat, Jacques Olivier. AU - Menget, Alain. AU - Franco, Patricia. AU - Regnard, Jacques. PY - 2009/6/1. Y1 - 2009/6/1. N2 - Objective: Tobacco smoke exposure increases the risk of premature birth and of dying of sudden infant death syndrome (SIDS). Prematurity significantly increases the risk of dying of SIDS, but mechanisms underlying this epidemiological finding are unclear. The cumulated effect of both prematurity and prenatal exposure to nicotine on autonomic heart rate control has not been studied. Methods: Using coarse-graining spectral analysis, we compared heart rate variability (HRV) indices of preterm newborns at 33-34 weeks post-conceptional age from smoking (n = 19) and non-smoking (n = 21) mothers. Assessment of tobacco exposure relied on maternal reports and newborns cotinine analysis. We ...
In western countries, sudden cardiac death (SCD) represents the most common form of cardiovascular death. SCD is often caused by ventricular arrhythmias in patients with a known history of ischemic heart disease but it may also occurs in healthy persons.. In the last years has been extensively studied the protective role of long-chain n-3 polyunsaturated fatty acids (n-3 LCPUFA) against SCD both in healthy persons and in patients affected by coronary artery disease.. The hypothesis that these evidences could be ascribed to an antiarrhythmic effect of n-3 LCPUFA, has been corroborated by the observation of a direct relationship between the dietary intake of these nutrients and a better cardiac autonomic control.. This pathway, in particular, has been confirmed by the analysis of changes in heart rate variability.. Most studies in this field used n-3 LCPUFA derived from fish oil, composed by a combination of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). At our knowledge there are few ...
Latest research into exercise physiology has shown that being able to exercise at 80% of your maximum heart rate will provide the most benefits as far as reducing cardiovascular disease, serious disease risk, lessing stress responses in your body and general well being.. We do not really mind what type of exercise you do, as long as your heart rate gets up close to the guidelines below and utilising interval training - where you go hard, then rest ie. exercising in bursts.. To determine maximum heart rate (HR):. 220 - your age.. Exercise plan:. 60 seconds at 65% of max HR, return to resting, x 6 times. Increase to 70%, then 80% as your fitness increases.. Any other questions? Pop in for an appointment for clarification.. Back to Blog ...
In 21 healthy full-term neonates, 122 10-min recordings of ECG and CO2 respirograms were made during the first 5 days of life. Records were analyzed with a digital computer, using stochastic point process analysis techniques to characterize variations in heart and respiration rates. Mean heart rate was 114/min, and mean respiration rate 46/min. For heart rate, the root mean square (RMS) difference from mean (overall variation) was 40 msec, and interval-to-interval variation (RMS of successive differences) was 25 msec; the corresponding values for respiration rate were 598 msec and 770 msec, respectively. Periodic heart rate variation (periodicities in the range 1-2 sec or 10-29 sec) was found in 8 records from 7 infants. Random heart rate variation was usually Markoffian type, inter-interval dependence extending over at least 5 successive intervals. No significant periodic variation or interdependence of intervals was detected in respiration rate, which thus appears to have certain Gaussian ...
Elevated resting heart rate is associated with greater risk of cardiovascular disease and mortality. In a 2-stage meta-analysis of genome-wide association studies in up to 181,171 individuals, we identified 14 new loci associated with heart rate and confirmed associations with all 7 previously established loci. Experimental downregulation of gene expression in Drosophila melanogaster and Danio rerio identified 20 genes at 11 loci that are relevant for heart rate regulation and highlight a role for genes involved in signal transmission, embryonic cardiac development and the pathophysiology of dilated cardiomyopathy, congenital heart failure and/or sudden cardiac death. In addition, genetic susceptibility to increased heart rate is associated with altered cardiac conduction and reduced risk of sick sinus syndrome, and both heart rate-increasing and heart rate-decreasing variants associate with risk of atrial fibrillation. Our findings provide fresh insights into the mechanisms regulating heart rate and
AIM: The aim of this study was to investigate heart rate variability (HRV) in a clinical sample of female adolescents with anxiety disorders (AD) and/or major depressive disorder (MDD) compared with healthy controls and to assess the effect of selective serotonin reuptake inhibitors (SSRI) on HRV.. METHODS: Heart rate variability was measured in adolescent female psychiatric patients with AD and/or MDD (n = 69), mean age 16.8 years (range: 14.5-18.4), from 13 out-patient clinics and in healthy controls (n = 65), mean age 16.5 years (range: 15.9-17.7). HRV was registered in the sitting position during 4 min with no interventions.. RESULTS: Logarithmically transformed high frequency HRV (HF), low frequency HRV (LF) and standard deviation of inter beat intervals (SDNN) were lower in the clinical sample compared with the controls (Cohens d for HF = 0.57, LF = 0.55, SDNN = 0.60). This was not explained by body mass index, blood pressure or physical activity. Medication with SSRI explained 15.5% of ...
BACKGROUND: Epilepsy patients may have an impaired autonomic cardiac control, which has been associated with an increased incidence of sudden unexpected death among people with epilepsy (SUDEP). The risk of SUDEP is particularly high among epilepsy surgery candidates with refractory epilepsy. This risk seems to be reduced after successful surgery but whether this is an effect of surgery or reflects pre-existing differences between good and poor responders is under debate.. METHODS: We used spectral analysis to analyze prospectively heart rate variability (HRV) preoperatively in 21 consecutive patients with temporal lobe epilepsy who were planned for epilepsy surgery. The presurgical HRV based on ambulatory 24 hours EKG recordings was analyzed in relation to seizure control at 1 year after surgery.. RESULTS: Patients had significantly lower SD of RR-intervals, total power, very low frequency power and low frequency power than matched healthy controls. Patients with good outcome of surgery (Engel ...
The purpose of this study was to evaluate differences in heart rate recovery (HRr) in trained and untrained adults, while assessing the role of...
Diabetes Risk Increases with High Heart Rate: Daily diabetes tips for diabetics. All the diabetes information for type 1 diabetics and type 2 diabetics.
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Samsung took a big step into the health and fitness market with its Galaxy S5. One of the devices main selling points is its built-in heart rate sensor. This new feature allows users to check their heart rate using the preinstalled S Health app, but the truth is, nothing special is happening here. According to Samsungs official Galaxy S5 page, its the first smartphone with a built-in heart rate sensor, but technically almost any device with a camera and flash is capable of providing this functionality. The same sensor is found on Samsungs new Gear smart watch lineup and certainly makes more sense ona wearable device, but unfortunately its nothing more than a gimmick on the Galaxy S5.. The heart rate sensor found on the back is no different than what many third party apps have offered for quite some time. Runtastics Heart Rate Monitor app is a perfect example. This app uses the LED flash and camera on almost any smartphone to read your heart rate, and it works surprisingly well.. As shown ...
TY - JOUR. T1 - Heart Rate Variability During Hemodialysis and Following Renal Transplantation. AU - Yang, Y. W.. AU - Wu, C. H.. AU - Tsai, M. K.. AU - Kuo, T. B.J.. AU - Yang, C. C.H.. AU - Lee, P. H.. PY - 2010/6. Y1 - 2010/6. N2 - Previous studies have shown awareness of uremic dysfunction in end-stage renal disease (ESRD) patients. Dysautonomia in ESRD patients may be reversible after renal transplantation. We used a power spectral analysis (PSA) of heart rate variability (HRV) to assess alterations of autonomic activity in 14 controls and 14 nondiabetic hemodialysis ESRD patients who had undergone renal transplantation. Compared with matched control subjects, the power frequency determinations of low frequency (LF; 3.42 ln(ms2) vs 6.38 ln(ms2); P , .05 high frequency (HF; 2.29 ln(ms2) vs 5.27 ln(ms2); P , .05)), and total power (TP; 5.39 ln(ms2) vs 7.53 ln(ms2); P , .05) were significantly suppressed in ESRD patients undergoing hemodialysis. ESRD patients showed significantly improved HRV ...
Currently, heart rate variability (HRV) is among the useful tools used to assess modulatory effects of the autonomic nervous system on the heart...
The purpose of this study is to investigate the relationship between evening exercise (EE) and late-night exercise (LNE) towards heart rate recovery (HRR) and sleep quality among male young adult in UiTM Pahang. There were 30 male young adult that actively playing futsal who participated in the study, age ranging from 18 to 23 years old. The subject were equally divided into two groups; evening exerciser (n=15), late-night exerciser (n=15). The dependent variable in the study was Three Minutes Step Test and answering the Pittsburgh Sleep Quality Index (PSQI) questionnaire. Based on Independent T-test analysis and Pearsons Correlation, there is significant different (p,0.05) was showed between heart rate after two minutes testing and sleep quality among evening and late-night group of exercises [M = 84.40, SD = 6.197], [M = 77.60, SD = 6.599]. Also, there is significant different between heart rate after testing and heart rate after two minutes testing among evening and late-night exercises [HR ...
Aims A very limited number of prospective studies have reported conflicting data on the relation between heart rate and diabetes risk. Our aim therefore was to determine in a large, national, population-based cohort if heart rate predicts the development of diabetes. Methods The Australian Diabetes Obesity and Lifestyle study followed up 6537 people over 5years. Baseline measurements included questionnaires, anthropometrics and blood and urine collection. Heart rate was recorded in beats per min (Dinamap). An oral glucose tolerance test was performed at baseline and follow-up, and diabetes was defined using World Health Organization criteria. Results A total of 5817 participants were eligible for analysis, 221 of whom developed diabetes. Compared with participants with a heart rate ,60bmin1, those with a heart rate 80bmin1 were more likely to develop diabetes (odds ratio1.89, 95%CI 1.073.35) over 5years, independent of traditional risk factors. This relationship was highly significant, ...
1. The purpose of this investigation was to determine non-invasively the changes in autonomic cardiovascular control observed in normal subjects submitted to acute cardiopulmonary blood volume expansion by 100° head-down tilt. The effect of head-down tilt on finger blood pressure and heart rate fluctuations was studied by means of power spectral analysis in 12 healthy men.. 2. Amplitude spectra of heart rate and blood pressure rhythmicity were estimated at the low-frequency (60-140 mHz, 10-s rhythm) and high-frequency (area under the curve at mean respiration rate ± 50 mHz) component. Transfer gain and phase were calculated between systolic blood pressure and heart rate. Forearm vascular resistance was estimated to validate the head-down procedure.. 3. Forearm vascular resistance decreased significantly from 19.82 (16.34-26.46) mmHg ml−1 min 100 ml to 18.05 (13.69-22.88) mmHg ml−1 min 100 ml (P , 0.01) during head-down tilt (values are medians and 25 and 75 percentiles). The overall ...
Modern heart rate monitors usually comprise two elements: a chest strap transmitter [needs update] and a wrist receiver (which usually is a smartwatch). In early plastic straps, water or liquid was required to get good performance. Later units have used conductive smart fabric with built-in microprocessors that analyze the EKG signal to determine heart rate. More recent devices use optics to measure heart rate using Infrared light.[2] This is achieved by production of infrared light by an internal bulb, as Infrared light is absorbed by the blood, a sensor measures the amount that the infrared light is darkened by. If it is significantly darker, due the pulse causing a temporary increase in the amount of blood that is travelling through the measured area, that is counted as a heart pulse.[2]. Strapless heart rate monitors (often referred to as wearables) now allow the user to just touch two sensors on a smartwatch display for a few seconds to view heart rate data. These are popular for comfort ...
The ability of the human organism to withstand physical strain is one of the most important characteristics of health. We can easily distinguish a person who is able to run 10 miles from an individual that cant even walk 100 yards without a break. The difference between them is in their physical fitness. But what is physical fitness? According to physiology it is first of all the ability of the cardio vascular system to provide the function of the organism in the state of heightened strain. Therefore, in assessing the state of the cardio vascular system we are also assessing the state of physical fitness. In recent times, for this purpose, the method of analyzing heart rate variability during the orthostatic challenge test became widely used.. Heart Rate Variability It is well‐known that orthostatic challenge test is one of the most informative methods used to detect subtle changes in cardiovascular function and specifically its regulatory mechanisms. When bodys position is changed from ...
The use of hand tools in industry is one of the many risky issues for musculoskeletal disorders. Working postures during handling tools assumed may be reiterated several times a day, every day for several years and can be predicted to affect the musculature of the workers. Using physiological demands to assess coordinated posture and anthropometry in manual handling tools has not received much attention in literature. Therefore, the aim of this research is to study the effects of combined postures of trunk and shoulder besides the individuals anthropometry on heart rate in vertical drilling task. Ten male students participated in this experiment and ANOVA (Analysis of variance) was used to analyse the data. The results showed that shoulder flexion and trunk inclining forward have a significant effect on heart rate (P , 0.01). Also, the anthropometric in terms of individuals weight and max grip strength has a negative correlation with heart rate (R2 = 0.46 and 0.13 respectively).. ...
Choir singing is known to promote wellbeing. One reason for this may be that singing demands a slower than normal respiration, which may in turn affect heart activity. Coupling of heart rate variability (HRV) to respiration is called Respiratory sinus arrhythmia (RSA). This coupling has a subjective as well as a biologically soothing effect, and it is beneficial for cardiovascular function. RSA is seen to be more marked during slow-paced breathing and at lower respiration rates (0.1 Hz and below). In this study, we investigate how singing, which is a form of guided breathing, affects HRV and RSA. The study comprises a group of healthy 18 year olds of mixed gender. The subjects are asked to; (1) hum a single tone and breathe whenever they need to; (2) sing a hymn with free, unguided breathing; and (3) sing a slow mantra and breathe solely between phrases. Heart rate (HR) is measured continuously during the study. The study design makes it possible to compare above three levels of song structure. In a