TY - JOUR. T1 - Tracking motor unit action potentials in the tibialis anterior during fatigue. AU - Beck, R.B.. AU - OMalley, M.J.. AU - Stegeman, D.F.. AU - Houtman, C.J.. AU - Connolly, S.. AU - Zwarts, M.J.. PY - 2005. Y1 - 2005. N2 - New surface electromyogram (SEMG) techniques offer the potential to advance knowledge of healthy and diseased motor units. Conduction velocity (CV) estimates, obtained from indwelling electrodes, may provide diagnostic information, but the standard method of CV estimation from SEMG may be of only limited value. We developed a motor unit (MU) tracking algorithm to extract motor unit conduction velocity (MUCV) and motor unit action potential (MUAP) amplitude estimates from SEMG. The technique is designed to provide a noninvasive means of accessing fatigue and recruitment behavior of individual MUs. We have applied this MU tracking algorithm to SEMG data recorded during isometric fatiguing contractions of the tibialis anterior (TA) muscle in nine healthy subjects, ...
TY - JOUR. T1 - Motor unit activity during isometric and concentric-eccentric contractions of the human first dorsal interosseus muscle. AU - Howell, J. N.. AU - Fuglevand, A. J.. AU - Walsh, M. L.. AU - Bigland-Ritchie, B.. N1 - Copyright: Copyright 2018 Elsevier B.V., All rights reserved.. PY - 1995. Y1 - 1995. N2 - 1. Motor unit activity was recorded with intramuscular fine wire electrodes during isometric, concentric, and eccentric activity in the human first dorsal interosseus muscle. Twenty-one units from 11 subjects were sampled. 2. During isotonic cycles of shortening and lengthening, 18 of 21 units were recruited during the concentric phase, increased their discharge rates as the concentric movement progressed, then decreased their discharge rate during the eccentric phase, and were derecruited. 3. A different pattern of recruitment was observed in recordings from three units. These units were recruited during the eccentric phase, at a time when other units were decreasing their ...
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Objective: Surface electromyography has been a long-standing source of signals for control of powered prosthetic devices. By contrast, force myography is a more recent alternative to surface electromyography that has the potential to enhance reliability and avoid operational challenges of surface electromyography during use. In this paper, we report on experiments conducted to assess improvements in classification of surface electromyography signals through the addition of collocated force myography consisting of piezo-resistive sensors ...
High-pass filtering (HPF) is a fundamental signal processing method for the attenuation of low-frequency noise contamination, namely baseline noise and movement artefact noise, in human surface electromyography (sEMG) research. Despite this, HPF is largely overlooked in equine sEMG research, with many studies not applying, or failing to describe, the application of HPF. An optimal HPF cut-off frequency maximally attenuates noise while minimally affecting sEMG signal power, but this has not been investigated for equine sEMG signals. The aim of this study was to determine the optimal cut-off frequency for attenuation of low-frequency noise in sEMG signals from the Triceps Brachii and Biceps Femoris of 20 horses during trot and canter. sEMG signals were HPF with cut-off frequencies ranging from 0-80 Hz and were subjected to power spectral analysis and enveloped using RMS to calculate spectral peaks, indicative of motion artefact, and signal loss, respectively. Processed signals consistently ...
TY - JOUR. T1 - Calf muscle activity alteration with foot orthoses insertion during walking measured by fine-wire electromyography. AU - Akuzawa, Hiroshi. AU - Imai, Atsushi. AU - Iizuka, Satoshi. AU - Matsunaga, Naoto. AU - Kaneoka, Koji. PY - 2016/12/1. Y1 - 2016/12/1. N2 - [Purpose] The purpose of the study was to assess the muscle activity change of the tibialis posterior, flexor digitorum longus, and peroneus longus during gait with orthoses. [Subjects and Methods] Sixteen healthy males participated in this study. Activity of each muscle was measured by using fine-wire and surface electromyography. Gait task was performed by the participants barefoot, with footwear and with orthoses. The electromyography data from a stance phase of each gait trial were used for analysis. The stance phase was divided into contact, midstance, and propulsion phases. The data from ten participants were extracted for final analysis, as electromyography measurements were unsuccessful for the other six. [Results] ...
TY - JOUR. T1 - Trunk muscle fatigue during a back extension task in standing. AU - Allison, Garry. AU - Henry, S.M.. PY - 2001. Y1 - 2001. N2 - There is some evidence that the fatiguing characteristics during isometric back extension tasks may assist in identifying differences between individuals with and without low back pain (LBP). During these tasks, especially in standing, other abdominal trunk muscles are also active. The abdominal trunk muscles acting across multiple segments of the lumbar spine function in isolation or in synergy to create flexion torques. It is suggested that co-activation patterns of the trunk muscles are able to control the axis of rotation of the extension torque and also provide multi-segmental stability of the spine. The purpose of this study was to examine the fatigue responses in 4 asymptomatic individuals to a sustained isometric extension task of the trunk muscles evaluating the shifts in the median frequency of the electromyographic (EMG) signal. This study ...
ORCID: 0000-0002-1552-8647 (2016) Electromyographic evaluation of hindlimb muscle activity patterns in elite and non- elite jumping athletes: a preliminary report on surface electromyography data. In: International Conference on Canine and Equine Locomotion 2016, 17-19 August, London. ...
This paper presents findings from a study of five healthy subjects performing 50% maximum voluntary contraction until complete fatigue of the muscle. An overlapping window technique was used to find the values for mean frequency (MNF), median frequency (MDF) of the power spectrum, root mean square (RMS) and muscle fibre conduction velocity (MFCV). The surface electromyography signal (sEMG) was collected from the vastus lateralis muscle using a three channel Laplacian electrode. The results show the MNF and MDF values showed a consistent trend with each other where they remained at steady values between 20-30% and 75-80% of the signal after which they fell 15-30% of this value. The RMS showed a linear increase in value. The MFCV showed a similar trend to that found in the MNF and MDF values ...
Introduction. Contributors.. 1 BASIC PHYSIOLOGY AND BIOPHYSICS OF EMG SIGNAL GENERATION (T. Moritani, D. Stegeman, R. Merletti).. 1.1 Introduction.. 1.2 Basic Physiology of Motor Control and Muscle Contraction.. 1.3 Basic Electrophysiology of the Muscle Cell Membrane.. References.. 2 NEEDLE AND WIRE DETECTION TECHNIQUES (J. V. Trontelj, J. Jabre, M. Mihelin).. 2.1 Anatomical and Physiological Background of Intramuscular Recording.. 2.2 Recording Characteristics of Needle Electrodes.. 2.3 Conventional Needle EMG.. 2.4 Special Needle Recording Techniques.. 2.5 Physical Characteristics of Needle EMG Signals.. 2.6 Recording Equipment.. References.. 3 DECOMPOSITION OF INTRAMUSCULAR EMG SIGNALS (D. W. Stashuk, D. Farina, K. Søgaard).. 3.1 Introduction.. 3.2 Basic Steps for EMG Signal Decomposition.. 3.3 Evaluation of Performance of EMG Signal Decomposition Algorithms.. 3.4 Applications of Results of the Decomposition of an Intramuscular EMG Signal.. 3.5 Conclusions.. References.. 4 BIOPHYSICS OF THE ...
Objective: This article presents the design and validation of an accurate automatic diagnostic system to classify intramuscular EMG (iEMG) signals into healthy, myopathy, or neuropathy categories to aid the diagnosis of neuromuscular diseases. Method: First, an iEMG signal is decimated to produce a set of disjoint downsampled signals, which are decomposed by the lifting wavelet transform (LWT). The Higuchis fractal dimensions (FDs) of LWT coefficients in the subbands are computed. The FDs of LWT subband coefficients are fused with one-dimensional local binary pattern derived from each downsampled signal. Next, a multilayer perceptron neural network (MLPNN) determines the class labels of downsampled signals. Finally, the sequence of class labels is fed to the Boyer-Moore majority vote (BMMV) algorithm, which assigns a class to every iEMG signal. Result: The MLPNN-BMMV classifier was experimented with 250 iEMG signals belonging to three categories. The performance of the classifier was validated ...
DESCRIPTION (provided by applicant): The objective of this proposal is to develop noninvasive surface electromyogram (EMG) examination methods to overcome disadvantages of routine invasive needle EMG for examination of spinal muscular atrophy (SMA) and other pediatric neuromuscular diseases. There are two planned aims for the proposed study. The first aim is to develop and test noninvasive surface EMG decomposition methods using flexible surface electrode arrays, thus laying the foundation for their broad clinical applications, particularly for pediatric population. This includes validating and refining the developed methods using both computational and experimental approaches. The second aim is to perform a surface EMG examination of the pathological changes in SMA patients, mainly at the motor unit level, using the newly developed noninvasive methods. The approach utilized in the proposed project lie in recent advances in both surface EMG recording and signal processing methods. Our research ...
The amount of documented increase in motor unit (MU) synchronization with fatigue and its possible relation with force tremor varies largely, possibly due to inhomogeneous muscle activation and methodological discrepancies and limitations. The aim of this study was to apply a novel surface electromyographical (EMG) descriptor for MU synchronization based on large MU populations to examine changes in MU synchronization with fatigue at different sites of a muscle and its relation to tremor. Twenty-four subjects performed an isometric elbow flexion at 25% of maximal voluntary contraction until exhaustion. Monopolar EMG signals were recorded using a grid of 130 electrodes above the biceps brachii. Changes in MU synchronization were estimated based on the sub-band skewness of EMG signals and tremor by the coefficient of variation in force. The synchronization descriptor was dependent on recording site and increased with fatigue together with tremor. There was a general association between these two ...
The effects of posture on trunk muscle strength under isometric and isokinetic conditions in 21 healthy male volunteers and the associated electromyographic activity for eight trunk muscles were investigated. The men performed 12 trunk extension exertions in standing and kneeling postures. Isometric tests were performed at 22.5, 45, and 67.5 degrees of trunk flexion. Isokinetic tests were performed at three velocities: 30, 60, and 90 degrees per second. Electromyographic data were collected from eight trunk muscles to assess muscle recruitment under each condition. A priori orthogonal contrasts were specified for analysis of both torque and electromyographic data. The findings suggest that the kneeling posture was associated with a 15% decrease in peak torque output when contrasted with standing. However, no concomitant change was noted in trunk muscle activity. Trunk hyperflexion and increasing rotational velocity were associated with reduced torque in both postures. Trunk muscle activity was ...
Citation: Saito, A., & Akima, H. (2015). Neuromuscular Activation of the Vastus Intermedius Muscle during Isometric Hip Flexion. PloS one, 10(10), e0141146. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4619471/ Neuromuscular Activation of the Vastus Intermedius Muscle during Isometric Hip Flexion Summary Saito, and Akima (2015) conducted research on the activation of the vastus intermedius versus the rectus femoris during…
The macro electromyography method was developed in the 1980s. Since then, technical modifications have been made, and a number of conditions have been explored. This study is a methodological introduction and an update of findings in some nerve-muscle disorders. The spike component of a motor unit potential (MUP) recorded by a concentric or monopolar needle electromyography (EMG) electrode is generated primarily by fibers within 1-2 mm of the needle recording area. Given that a MUPs typical anatomical reach is 5-15 mm in diameter, it follows that conventional EMG is unable to record activity from the entire motor unit. Such information could promote understanding of muscle in health and disease. Macro EMG, with its large recording area, appears to provide this information by recording the activity from most of the fibers in a given motor unit. The value of combining macro EMG with single-fiber EMG and conventional EMG recordings is discussed.. ...
TY - JOUR. T1 - The effects of age on antagonist muscle activation during maximum voluntary efforts of the knee extensors and flexors. AU - Unnithan, V.. AU - Kellis, E.. PY - 1997/5. Y1 - 1997/5. N2 - The purpose of this study was to test the hypothesis that children demonstrate greater antagonist activity levels compared to adults. Nine girls(age 12.7 ± 0.7 years) and nine (age 22.7 ± 2.3) females performed maximum eccentric and concentric efforts of knee extensors and flexors on a Biodex dynamometer at 30°·s-1. The electromyographic (EMG) activity of vastus lateralis and hamstrings was also recorded. The EMG was full-wave rectified and integrated (IEMG) over 10 ms intervals. The antagonist IEMG was normalized as a percentage of the IEMG activity of the same muscle group when acting as agonist, at the same angular velocity, angular position and muscle action. The mean and standard deviation of the normalized IEMG of the hamstrings in 23 years old was 16.8 ± 7.1% and 19.56 ±8.4% under ...
TY - JOUR. T1 - Hierarchical domain adaptation for SEMG signal classification across multiple subjects.. AU - Chattopadhyay, Rita. AU - Krishnan, Narayanan C.. AU - Panchanathan, Sethuraman. PY - 2011. Y1 - 2011. N2 - Large variations in Surface Electromyogram (SEMG) signal across different subjects make the process of automated signal classification as a generalized tool, challenging. In this paper, we propose a domain adaptation methodology that addresses this challenge. In particular we propose a hierarchical sample selection methodology, that selects samples from multiple training subjects, based on their similarity with the target subject at different levels of granularity. We have validated our framework on SEMG data collected from 8 people during a fatiguing exercise. Comprehensive experiments conducted in the paper demonstrate that the proposed method improves the subject independent classification accuracy by 21% to 23% over the cases without domain adaptation methods and by 14% to 20% ...
years) were recruited. On two separate occasions, subjects visited a garden plot to perform digging, raking, troweling, weeding, and hoeing; all tasks were performed three times with 20 s intervals for each trial. To measure muscle activation during the five gardening tasks, surface EMG was used. Bipolar surface EMG electrodes were attached to eight upper limb muscles (bilateral anterior deltoid, biceps brachialis, brachioradialis, and flexor carpi ulnaris) or eight lower limb muscles (bilateral vastus lateralis, vastus medialis, biceps femoris, and gastrocnemius) on both sides of the body, for a total of 16 muscles. During the five tasks, photographs were taken of movement phases using a digital video camera. The right flexor carpi ulnaris and brachioradialis showed higher activation than the other upper and lower limb muscles measured during the tasks. All 16 upper and lower limb muscles were actively used only during digging. According to movement analysis of each activity, digging was ...
The purpose of this study was to examine the effects of 5 d of creatine (Cr) loading on the electromyographic fatigue threshold (EMG FT) in college-age men. Sixteen men (age 22.4 ± 2.6 yr, height 177.4 ± 6.8 cm, weight 79.5 ± 10.6 kg; M ± SD) participated in this double-blind study and were randomly placed into either placebo (Pl; 10 g of flavored fructose powder per packet; n = 8) or Cr (5 g dicreatine citrate plus 10 g of flavored fructose powder per packet; n = 8) loading groups. Each participant ingested 1 packet 4 times/d, totaling 20 g/d for 5 days (loading). Before and after loading, each participant performed a discontinuous cycle-ergometer test to determine his EMG FT, using bipolar surface electrodes placed on the vastus lateralis of the right thigh. Four 60-s work bouts (ranging from 200 to 400 W) were completed. Adequate rest was given between bouts to allow for the participants heart rate (HR) to drop within 10 beats of their resting HR. The EMG amplitude was averaged over 5-s ...
Electromyography or EMG is a diagnostic test used to evaluate the electrical activity in your nerves as they transmit messages to your muscles when the muscles are contracting and when theyre at rest. The purpose of an EMG is to assess the health of your muscles and the nerves that control them. During an Electromyography , a thin needle with an electrode is inserted through your skin into a muscle. The electrode records the electrical activity in your nerve and muscle and transmits it to a receiver that displays the electromyography results on a printout or on a computer screen. The electrical activity recorded during an electromyography may also be broadcast over a speaker for your physician to hear.. An EMG can help diagnose disorders that affect muscle and nerve function, such as muscular dystrophies, and nerve disorders, such as neuropathies.. The activity of your muscles and the nerves that control them produce electrical signals. A healthy, relaxed muscle is electrically silent. When you ...
Electromyography (EMG) is a diagnostic procedure to assess the health of muscles and the nerve cells that control them (motor neurons). The nerves transmit electrical signals that cause muscles to contract. An EMG translates these signals into graphs, sounds or numerical values that a specialist interprets. EMG results can reveal nerve dysfunction, muscle dysfunction or problems with nerve-to-muscle signal transmission. At Technomed we understand the importance of a crystal clear signal, ease of use and patient comfort in EMG. Our EMG Needles are designed to give the optimal balance between needle sharpness and control of movement inside the muscle. For EMGs Technomed has Monopolar and Concentric Needle Electrode and Adhesive Surface Electrodes. A related treatment of EMG is EMG with injection of medication, for example botulinum toxin. This treatment is done in case of unwanted muscle contraction or overstimulated nerves. The nerves are unable to transmit the signal to the muscle (trough the brain).
Purpose: This study was designed to assess muscle coordination during a specific all-out sprint cycling task (Sprint). The aim was to estimate the EMG activity level of each muscle group by referring to the submaximal cycling condition (Sub150 W) and to test the hypothesis that a maximal activity is reached for all of the muscles during Sprint. Methods: Fifteen well-trained cyclists were tested during submaximal and sprint cycling exercises and a series of maximal voluntary contractions (MVCs) in isometric and isokinetic modes (MVC at the three lower limb joints). Crank torque and surface EMG signals for 11 lower limb muscles were continuously measured. Results:Results showed that Sprint induced a very large increase of EMG activity level for the hip flexors (multiplied by 7-9 from 150 W to Sprint) and the knee flexors and hip extensors (multiplied by 5-7), whereas plantar flexors and knee extensors demonstrated a lower increase (multiplied by 2-3). During Sprint, EMG activity level failed to reach a
METHODS: Fifty-three adults (30 men, 23 women; 25 + 4.7 y; 74.9 + 13.3 kg; 172.7 + 9.1 cm) volunteered to participate in this study. The electromyography (EMG) activity of the upper and lower regions of the rectus abdominus (URA and LRA, respectively), the external oblique (RO), and paraspinal (PS) muscle was measured during three abdominal exercises performed by each participant on the AI and MT using surface EMG. Surface electrodes were placed on the right and left sides of the trunk for each muscle group. Each participant performed one set of five repetitions for the following three exercies: 1) traditional crunch, 2) split leg scissors, and 3) bilateral heel drops from a table top position. Adequate rest time was allowed between sets to avoid fatigue and the testing order for both exercises and the exercise condition (AI vs MT) was randomized. Paired t-Tests were used to detect differences in relative mean EMG activity between the AI and MT for each exercise, and Bonferroni adjustments were ...
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Two back-EMF-based position observers are compared for motion-sensorless synchronous reluctance motor drives. The reduced-order observer is of the second order, and the adaptive full-order observer is of the fourth order. The proposed design rules guarantee the stability of the adaptive full-order observer, if the parameter estimates are accurate. The observers are experimentally evaluated using a 6.7-kW synchronous reluctance motor drive in low-speed operation and under parameter errors. The gain selection of the second-order observer is easier, but the adaptive full-order observer is more robust against parameter variations and spatial harmonics ...
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OBJECTIVE: to study the influence of 10 min of cyclic twisting motion on abdominal and back muscle activities. BACKGROUND: repetitive (cyclic) occupational activity was identified by many epidemiological reports to be a risk factor for the development of work-related musculoskeletal disorders. Biomechanical and physiological confirmation, however, is lacking. METHODS: trunk muscle electromyography
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This study aimed to examine a wide profile of acute biochemical and neuromuscular responses to strength (STR) and hypertrophy (HYP) resistance exercise (RE). Seven trained men completed an STR workout (4 × 6 repetitions, 85% 1 repetition maximum [1RM], 5-minute rest periods), an HYP workout (4 × 10 repetitions, 70% 1RM, 90-second rest periods), and a control condition (CON) in a randomized crossover design. Peak force (PF), rate of force development (RFD), and muscle activity were quantified before and after exercise during an isometric squat protocol. Blood samples were taken 20, 10, and 0 minutes before and 0, 10, and 60 minutes after exercise to measure the concentration of blood lactate (BL), pH, and a number of electrolytes that were corrected for plasma volume changes. No differences were observed between the workouts for changes in PF, RFD, or muscle activity. Repeated contrasts revealed a greater (p ≤ 0.05) increase in BL concentration and reduction in pH after the HYP protocol than ...
An experiment was designed using muscle electromyography to determine if an optimum cylindrical handle size exists. The experiment had two phases. One phase was concerned with an experimental task of gripping a cylindrical handle and performing a simple task routine to evaluate the optimum handle size. The other phase was concerned with a fatigue test utilizing the same cylindrical handles. The experimental variables wore: hand size, weight resistance, and cylindrical handle diameter. Findings indicate that generally the 20 in. diameter handle showed lowest EMG activity. The 1-5 in. diameter handle was found to be the optimum handle size based on the ratio between force applied and the EMG activity measured. The 1.5 in. diameter handle was found to provide the maximum number of completed task cycles before the onset of fatigue.. ...
Changes in surface electromyography signals and kinetics associated with progression of fatigue at two speeds during wheelchair propulsion.: The purpose of this
Gait disturbance in individuals with spinal cord lesion is attributed to the interruption of descending pathways to the spinal locomotor center, whereas neural circuits below and above the lesion maintain their functional capability. An artificial neural connection (ANC), which bridges supraspinal centers and locomotor networks in the lumbar spinal cord beyond the lesion site, may restore the functional impairment. To achieve an ANC that sends descending voluntary commands to the lumbar locomotor center and bypasses the thoracic spinal cord, upper limb muscle activity was converted to magnetic stimuli delivered noninvasively over the lumbar vertebra. Healthy participants were able to initiate and terminate walking-like behavior and to control the step cycle through an ANC controlled by volitional upper limb muscle activity. The walking-like behavior stopped just after the ANC was disconnected from the participants even when the participant continued to swing arms. Furthermore, additional ...
Background: Fear of frailty is a main concern for seniors. Surface electromyography(sEMG) controlled assistive devices for the upper extremities could potentially be usedto augment seniors force while training their muscles and reduce their fear of frailty.In fact, these devices could both improve self confidence and facilitate independentleaving in domestic environments. The successful implementation of sEMG controlleddevices for the elderly strongly relies on the capability of properly determining seniorsactions from their sEMG signals. In this research we investigated the viability ofclassifying hand postures in seniors from sEMG signals of their forearm muscles.Methods: Nineteen volunteers, including seniors (70 years old in average) andyoung people (27 years old in average), participated in this study and sEMG signalsfrom four of their forearm muscles (i.e. Extensor Digitorum, Palmaris Longus, FlexorCarpi Ulnaris and Extensor Carpi Radialis) were recorded. The feature vectors werebuilt by ...
The mechanical properties of muscle are shown to have a significant influence on the duration of the silent period in the soleus EMG. In contrast to this, the mechanical events have no influence on the duration of the reciprocal inhibition of the anterior tibial muscle. However, a second, delayed cessation of the EMG activity in the anterior tibial muscle is due to mechanical events.. ...
Electromyography (EMG) is a medical test performed to evaluate and record the electrical activity (electromyogram) produced by skeletal muscles using an instrument called electromyograph. EMG test is often performed together with another test called nerve conduction study, that measures the conducting function of nerves. The electrical source is the resting membrane potential (RMP) which is about -90 mV for skeletal muscles. Measured EMG potentials range between less than 50 μV and up to 20 to 30 mV depending upon the muscle under observation.. ...
Investigation and management of muscle and nerve disorders.. Siow Neurology, Headache and Pain centres have onsite EMG equipment. This treatment is used for evaluating and recording the electrical activity produced by skeletal muscles. EMG is performed with an Electromyograph, to produce a record called an electromyogram. An injection into various muscles will pick up the electrical activity given out by muscles and tell us if there is nerve or muscle disease from this.. EMG is most often used when patients have symptoms of weakness, and examination shows impaired muscle strength. It can help to tell the difference between muscle weakness caused by injury of a nerve attached to a muscle and weakness due to neurological disorders.. There is little or no preparation for EMG. Body lotions are to be avoided prior to the use of EMG as this may reduce the reading. Blood Thinners are also to be avoided as again this may distort the electromyogram reading.. ...
electromyography definition: a technique for assessing and tracking the activation signal of muscle tissue; analysis of neuromuscular disorders with the use of an electromyograph; an approach for assessing…
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TY - GEN. T1 - User-independent hand motion classification with electromyography. AU - Gibson, Alison E.. AU - Ison, Mark R.. AU - Artemiadis, Panagiotis. PY - 2013. Y1 - 2013. N2 - Electromyographic (EMG) processing is an important research area with direct applications to prosthetics, exoskeletons and human-machine interaction. Current state of the art decoding methods require intensive training on a single user before it can be utilized, and have been unable to achieve both userindependence and real-time performance. This paper presents a real-time EMG classification method which generalizes across users without requiring an additional training phase. An EMGembedded sleeve quickly positions and records from EMG surface electrodes on six forearm muscles. An optimized decision tree classifies signals from these sensors into five distinct movements for any given user using EMG energy synergies between muscles. This method was tested on 10 healthy subjects using leave-one-out validation, ...
This paper (Part II of two) presents an experimental demonstration of the performance achieved by implementing the mathematically derived optimal myoproces
Electromyography: Electromyography or EMG is a diagnostic test that understands the physiological of muscles thereby assessing their health.
Principal Investigator:NAKAHIRA MAYA, Project Period (FY):2017-04-01 - 2020-03-31, Research Category:Grant-in-Aid for Young Scientists (B), Research Field:Rehabilitation science/Welfare engineering
SEMG is the study of muscle status (activity) using surface electrodes. Fremont Dentist Preet Sahota believes this tool can be valuable in diagnosing...
Electromyographic (EMG) activities of gluteus maximus (GL), vastus later-alis (VL), vastus medialis (VM), tibialis anterior (TA), and gastrocnemius (GA) were measured telemetrically from four world-class athletes during the entire ski jumping performance. Integrated electromyographic activities (IEMG) were calculated from the different phases of jump. TA and GA showed alternate activation during the curve, suggesting that maintenance of the inrun position is a process requiring continuous active control. VL and VM were observed to contribute mostly to the entire takeoff phase whereas GL became strongly active within the last 4 meters of the takeoff. GA was slightly but continuously active during the inrun and showed only a small increase during takeoff. The quick lifting of the skis, as evidenced by the activation of TA, does not seem to allow effective use of GA at the end of the takeoff. Strong continuous activity of the knee extensors and TA dominated the midflight phase whereas the ...
TY - JOUR. T1 - Combinations of muscle synergies in the construction of a natural motor behavior. AU - DAvella, Andrea. AU - Saltiel, Philippe. AU - Bizzi, Emilio. PY - 2003/3/1. Y1 - 2003/3/1. N2 - A central issue in motor control is how the central nervous system generates the muscle activity patterns necessary to achieve a variety of behavioral goals. The many degrees of freedom of the musculoskeletal apparatus provide great flexibility but make the control problem extremely complex. Muscle synergies - coherent activations, in space or time, of a group of muscles - have been proposed as building blocks that could simplify the construction of motor behaviors. To evaluate this hypothesis, we developed a new method to extract invariant spatiotemporal components from the simultaneous recordings of the activity of many muscles. We used this technique to analyze the muscle patterns of intact and unrestrained frogs during kicking, a natural defensive behavior. Here we show that combinations of ...
Synchrony of coupled oscillations of ipsilateral hand and foot may be achieved by controlling the interlimb phase difference through a crossed kinaesthetic feedback between the two limbs, or by an independent linkage of each limb cycle to a common clock signal. These alternative models may be experimentally challenged by comparing the behaviour of the two limbs when they oscillate following an external time giver, either alone or coupled together. Ten subjects oscillated their right hand and foot both alone and coupled (iso- or antidirectionally), paced by a metronome. Wrist and ankle angular position and Electromyograms (EMG) from the respective flexor and extensor muscles were recorded. Three phase delays were measured: i) the clk-mov delay, between the clock (metronome beat) and the oscillation peak; ii) the neur (neural) delay, between the clock and the motoneurone excitatory input, as inferred from the EMG onset; and iii) the mech (mechanical) delay between the EMG onset and the corresponding point
Just look up the definitions of agonist and agonist muscle. Doing the research for yourself will engrave this knowledge into your brain. Enjoy your studies ...
An electromyogram test, EMG, electromyography is a test that is used to record the electrical activity of muscles. Contact City Xray & Scan Clinic for EMG test booking.
While both the Barbell Press and the Dumbell Press activate the same group of muscles, Dumbell Press requires more stabilization.. This means you wont be able to do as much total weight, but Dumbells have their advantages.. A 2013 study from the Journal Of Strength And Conditioning Research sought to determine whether shoulder pressing with dumbells or barbells activated more muscle.. Its worth mentioning that the researchers in this study used electromyogram activity (EMG) as the metric for measuring total muscle engagement.. [alert color=blue] EMG really measures the electrical activity produced in muscles when they contract. This method is fairly accurate for measuring total muscle engagement, but its not dead on.. Some variation should be expected…. [/alert] The researchers concluded that, while muscle recruitment was similar between these two exercises, the Dumbbell Press was shown to activate the muscles in the shoulder more than the Barbell Press. This doesnt mean dumbbells are ...