• Baroreflex sensitivity (BRS) was estimated by the sequence method. (frontiersin.org)
  • for the GDS group, Impairment in Baroreflex Sensitivity in Recent-Onset Type 2 Diabetes Without Progression Over 5 Years. (diabetesjournals.org)
  • Impaired baroreflex sensitivity (BRS) predicts cardiovascular mortality and is prevalent in long-term diabetes. (diabetesjournals.org)
  • Sex Differences in the Relationship Between Baroreflex Effectiveness Index and Spontaneous Cardiac Baroreflex Sensitivity" by Ziba Taherzadeh, Nicole A. Garza et al. (wku.edu)
  • It is unclear whether BEI provides independent or complementary information compared to traditional spontaneous cardiac baroreflex sensitivity (BRS) measures. (wku.edu)
  • Arterial pressure (AP) was directly recorded and baroreflex sensitivity was evaluated by heart rate responses to AP changes. (fapesp.br)
  • We tested the hypothesis that PTSD patients have augmented sympathetic nervous system (SNS) and hemodynamic reactivity during mental stress, and impaired arterial baroreflex sensitivity (BRS). (neurosciencenews.com)
  • The reduction in MAP was correlated with increased parasympathetic activity and baroreflex sensitivity and decreased sympathetic activity, mainly during quiet sleep. (nature.com)
  • Furthermore we can evaluate the baroreflex sensitivity of an artery by the use of arterial tone. (longdom.org)
  • METHODS: LV end-systolic and end-diastolic dimensions (echocardiography), arterial baroreflex sensitivity (slope of ΔRR/Δsystolic BP during phenylephrine or nitroglycerin bolus), and neurohumoral profiles (plasma norepinephrine, renin activity, and arginine vasopressin) were measured serially in conscious dogs (n=24) with progressive LV dysfunction due to rapid ventricular pacing. (bvsalud.org)
  • RESULTS: Cardiopulmonary baroreflex sensitivity (slope of %ΔRNA/ΔPCWP) for mild LVD (-17.8%/mmHg) was the same as controls (-17.7%/mmHg). (bvsalud.org)
  • Arterial baroreflex sensitivity was preserved at all stages of LVD. (bvsalud.org)
  • This is caused by effects of fentanyl on arterial baroreflex sensitivity. (anesthesiaexam.com)
  • A study published in 2005 in Hypertension found that slow breathing improves arterial baroreflex sensitivity and is potentially beneficial in managing high blood pressure. (emedihealth.com)
  • baroreflex sensitivity in ms/mm Hg (BRS) and baroreflex sensitivity in Hz/mm Hg (BRSf), were determined by spectral analysis, in 20 normotensive volunteers age of 27+/-6 years (mean+/-S.D.) who served as their own control. (who.int)
  • This paper briefly reviews the historical evolution of ideas about how baroreflexes operate and continue to regulate arterial blood pressure during exercise. (elsevierpure.com)
  • Additionally, we found that males, but not females (regardless of age) demonstrated a relationship between the central and peripheral baroreflex arcs, indicating that females do not rely on this compensatory neuro-cardiovascular relationship to regulate arterial blood pressure at rest. (uwo.ca)
  • Baroreflex dysfunction and deranged cardiovascular variability are also common findings in cardiovascular disease. (elsevierpure.com)
  • A blunted baroreflex gain and impaired heart rate variability are predictive of poor outcome in patients with heart failure and myocardial infarction and may represent an early index of autonomic activation in left ventricular dysfunction. (elsevierpure.com)
  • The DOTC (bradycardic and tachycardic responses) and DOTA (tachycardic responses) groups showed attenuation in baroreflex dysfunction observed in DOS and DOTR, as well as an improvement in AP variance. (fapesp.br)
  • Abstract for "Baroreflex dysfunction and augmented sympathetic nerve responses during mental stress in veterans with posttraumatic stress disorder (PTSD)" by Jeanie Park, Paul J. Marvar, Peizhou Liao, Melanie L. Kankam, Seth D. Norrholm, Ryan M. Downey, S. Ashley McCullough, Ngoc-Anh Le, and Barbara O. Rothbaum in Journal of Physiology . (neurosciencenews.com)
  • Third, are there any pathophysiological conditions in which manipulation of baroreflexes or baroreflex 'dysfunction' might alter exercise responses? (elsevierpure.com)
  • We determined whether vagal cardiopulmonary baroreflex control of renal sympathetic nerve activity is abnormal in dogs with left ventricular (LV) dysfunction in the absence of clinical HF, and the relationship of abnormalities in baroreflexes to the development of the neurohumoral excitatory state. (bvsalud.org)
  • Since EPR dysfunction has been associated with arterial hypertension and heart failure, [ 1 , 2 , 5 - 8 ] precise knowledge about its interactions is vital also for developing new targeted therapies in these conditions. (ijpp.com)
  • The mechanisms mediating these relationships are not well understood and may in part be the result of cardiac structural changes and/or altered central neural processing of baroreflex signals. (elsevierpure.com)
  • Due to the baroreflex, this inhibits sympathetic vasomotor and cardiac stimulation and increases parasympathetic stimulation of the heart causing vasodilation and a lowered heart rate. (wikipedia.org)
  • A compromised baroreflex system increases the likelihood of serious outcomes, including cardiac arrest. (medicalnewstoday.com)
  • Neural baroreflex insufficiencies often lead to heart rhythm problems and cardiac arrest. (medicalnewstoday.com)
  • First, sports based physical activity strengthens the neural baroreflex, thus reducing the chances of cardiac issues - as health experts have long been suggesting. (medicalnewstoday.com)
  • Baroreflex effectiveness index (BEI) is a relatively new measure used to assess cardiac baroreflex function. (wku.edu)
  • The sustainer phenotype, with smallest upright decrease in cardiac output and highest sympathovagal balance, was independently associated with increased large arterial stiffness. (biomedcentral.com)
  • Porter JP, Phillips A, Rich J, Wright D. Effect of chronic stress on the cardiac baroreflex in the post-weanling rat. (wustl.edu)
  • Study One examined the impact of aging on the central and peripheral arcs of the sympathetic baroreflex under resting conditions. (uwo.ca)
  • This study revealed that middle-aged-to-older adults demonstrated heightened sympathetic baroreflex control of MSNA and AP discharge (i.e., greater central arc), but attenuated sympathetic transduction into blood pressure (i.e., attenuated peripheral arc). (uwo.ca)
  • CONCLUSIONS: Vagal cardiopulmonary baroreflex control of renal sympathetic nerve activity is blunted early in the development of LVD. (bvsalud.org)
  • Positive expiratory pressure improves arterial and cerebral oxygenation in acute normobaric and hypobaric hypoxia. (unil.ch)
  • Project Summary Ann M. Schreihofer Obesity impairs short-term regulation of mean arterial pressure (MAP) by autonomic reflexes, contributing to the destabilization of MAP. (unthsc.edu)
  • They also develop sympathetically-driven hypertension with diminished baroreflex control of sympathetic nerve activity (SNA) and heart rate (HR) compared to lean Zucker rats. (unthsc.edu)
  • Amelioration of hypertension or impaired glycemic control in adult male OZR each partially restores baroreflex control of HR, although the fates of NTS function and other sympatho- inhibitory reflexes are not known. (unthsc.edu)
  • Female OZR develop metabolic syndrome, but impaired baroreflexes emerge later, well beyond the development of hypertension. (unthsc.edu)
  • Within individual neurogenic baroreflex cycles, the amount of muscle sympathetic nerve activity (MSNA), the diastolic pressure stimulus and response amplitudes, diastolic pressure to MSNA burst stimulus and response times, as well as the stimulus and response slopes between diastolic pressure and MSNA were computed. (hal.science)
  • Recording of the temporal relationship of repeating oscillatory pattern between arterial blood pressure (BP) and muscle sympathetic nerve activity (MSNA) obtained from a healthy human during simulated hemorrhage of an estimated 25% blood loss induced by 70 mmHg LBNP. (comprehensivephysiology.com)
  • Conversely, although blockade of neuropeptide Y Y1 receptors in the paraventricular nucleus increased LSNA, mean arterial pressure, and heart rate, these responses were prevented by intracerebroventricular or arcuate nucleus injections of leptin, suggesting that, at least in part, leptin also increases sympathetic nerve activity by suppression of tonic neuropeptide Y inhibitory inputs from the arcuate nucleus. (elsevierpure.com)
  • Responses of heart rate (broken line) and mean arterial pressure (solid line) during graded LBNP in a single subject demonstrating the onset of severe hypotension and bradycardia with hemodynamic decompensation. (comprehensivephysiology.com)
  • Study Two investigated the interactive effects of age and sex on sympathetic vascular transduction (i.e., the transmission of MSNA into peripheral vasoconstriction) as well as the central and peripheral arcs of the baroreflex at rest. (uwo.ca)
  • In this context, ideas related to baroreflex resetting during exercise are emphasized, and the potential improvement in exercise tolerance in cardiovascular disease that might be achieved by electrical stimulation of the carotid sinus nerve is highlighted. (elsevierpure.com)
  • Consequently, brain injuries or ischemia may induce baroreflex impairment and deranged cardiovascular variability. (elsevierpure.com)
  • The arterial baroreflex is one of the main mechanisms by which short term blood pressure is controlled. (syncopedia.org)
  • The arterial baroreflex contributes importantly to the short-term regulation of blood pressure and cardiovascular variability. (elsevierpure.com)
  • Baroreflex‐mediated changes in heart rate and vascular resistance in response to variations in blood pressure are critical to maintain homeostasis. (hal.science)
  • Coherence, gain, and frequency of highest coherence between systolic/diastolic arterial pressure (SAP/DAP) and RR‐interval time series were also computed. (hal.science)
  • the baroreflex mechanoreceptors in the carotid and aorta blood vessels control the body's rapid response to - and accommodation of - changes in blood pressure . (medicalnewstoday.com)
  • In other hand, it promoted a hypotensive activity by significant reduction in arterial blood pressure without change heart rate, confirming the therapeutic use as antihypertensive for this plant. (researchgate.net)
  • Heart rate (ECG) and beat-to-beat arterial blood pressure (finger photoplethysmography) were continuously recorded during a five-minute resting baseline. (wku.edu)
  • BEI was quantified as the ratio of the number of baroreflex-driven ramps relative to all systolic blood pressure ramps. (wku.edu)
  • Here we address the question as to whether the low frequency variability (approximately 0.1 Hz) of the heart period may depend on a baroreflex-mediated response to blood pressure oscillations, induced by the alpha-sympathetic drive on the peripheral resistance. (researchgate.net)
  • 2. Heart period (ECG), finger arterial pressure (Finapres) and respiratory airflow were recorded in eight healthy volunteers in the supine position with metronome respiration at 0.25 Hz. (researchgate.net)
  • 5. We conclude that in supine rest conditions, the oscillation of RR at low frequency is almost entirely accounted for by a baroreflex mechanism, since it is not produced in the absence of a 0.1 Hz pressure oscillation. (researchgate.net)
  • 6. The results provide physiological support for the use of non-invasive estimates of the closed-loop baroreflex gain from cross-spectral analysis of blood pressure and heart period variability in the 0.1 Hz range. (researchgate.net)
  • Electroencephalogram, electromyogram, electrocardiogram, and mean arterial pressure (MAP) were recorded simultaneously for 24 h once a week over 11 weeks. (nature.com)
  • Intracerebroventricular injection of leptin slowly increased lumbar sympathetic nerve activity (LSNA), heart rate, mean arterial pressure, and baroreflex control of LSNA and heart rate. (elsevierpure.com)
  • Injection of the melanocortin 3/4 receptor agonist melanotan-II into the paraventricular nucleus increased LSNA, mean arterial pressure, and heart rate only after blockade of neuropeptide Y Y1 receptors. (elsevierpure.com)
  • We applied simultaneous spectral analysis of electroencephalographic (EEG) and systemic arterial pressure signals in Sprague-Dawley rats to monitor the status of consciousness and cardiovascular functions during intravenous anesthesia with propofol and to assess their correlations with plasma propofol concentration. (tmu.edu.tw)
  • Power spectral analysis of systemic arterial pressure signals indicated that this was accompanied by a progressive depression of spectral parameters that signify peripheral vascular resistance and baroreceptor reflex response. (tmu.edu.tw)
  • First, do baroreflexes contribute to arterial blood pressure regulation during exercise? (elsevierpure.com)
  • Second, if baroreflexes contribute to blood pressure regulation during exercise, how do they do it? (elsevierpure.com)
  • Comparisons of mean arterial blood pressures in rats (closed circles, solid lines) and humans (open circles, broken lines) during progressive lower body negative pressure (A) and controlled hemorrhage (B). (comprehensivephysiology.com)
  • UNLABELLED: The aim of this study is to analyse the acute effect of water-pipe smoking on heart rate, blood pressure and the baroreflex control of heart rate. (who.int)
  • We aimed to develop time domain analysis methods to complement existing cross‐spectral techniques in the investigation of the vascular resistance baroreflex response to orthostatic stress. (hal.science)
  • Illustration of changes in features of an integrated arterial waveform when progressing from a normal blood volume to a state of central hypovolemia such as hemorrhage. (comprehensivephysiology.com)
  • Lanfranchi, PA & Somers, VK 2002, ' Arterial baroreflex function and cardiovascular variability: Interactions and implications ', American Journal of Physiology - Regulatory Integrative and Comparative Physiology , vol. 283, no. 4 52-4, pp. (elsevierpure.com)
  • A number of factors (including reflex, humoral, behavioral, and environmental) may influence gain and effectiveness of the baroreflex, as well as cardiovascular variability. (elsevierpure.com)
  • This latter condition occurs independent of impaired baroreflexes and also increases MAP variability. (unthsc.edu)
  • The authors found no particular connection between leisure activity or total activity and either mechanical or neural baroreflex. (medicalnewstoday.com)
  • In this review, we briefly summarize experiments focused on the issue of interactions between mechano-, metabo, chemo-, and baroreflex during exercise. (ijpp.com)
  • Results clarified the role of different branches of the baroreflex loop, and suggested functional adaptation of neuronal pathways to orthostatic stress. (hal.science)
  • Therefore, it appears that the interactive nature between the central and peripheral baroreflex arcs are preserved with human aging, and that greater baroreflex control of sympathetic discharge may be compensatory for attenuated sympathetic transduction amongst older adults. (uwo.ca)
  • Over the past 60 years, due to the advancement of hemo- the Work Group and tasked it with planning, developing, dialysis (HD) technology and the introduction of medical reviewing, and disseminating appropriate HD treatment insurance, dialysis treatment has become widespread, en- guidelines in accordance with international standards. (bvsalud.org)
  • Baroreflex buffering is reduced with age in healthy men. (colorado.edu)