Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"Maximal Voluntary Contraction"”.
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The reliability of an isometric test based on constant perception of effort
… control neuromuscular output during an isometric contraction. 21 varsity athletes completed a maximal voluntary contraction and a 2 min constant force contraction at both the start and end of the study. Between pre and post testing all participants completed a 2 min constant perceived exertion …
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Biomechanics Of Slips In Alternative Footwear
… a counterbalanced selection and were tested for maximal voluntary contraction for lower extremity muscles and were exposed to a series of walking trails that included a normal dry surface non slip gait trial (ns); unexpected slip (us), alert slip (as) and expected slip (es). A 3 x 4 [3 (ff, cc, …
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Transcranial Direct Current Stimulation of the Dorsolateral Prefrontal Cortex Does Not Improve Handgrip Time-to-Failure or Alter Central or Peripheral Hemodynamics
… older. Twenty-five participants completed five maximal voluntary contractions, followed by 20-minutes of a-tDCS or SHAM conditions. Next, participants completed a handgrip time-to-failure task by maximally squeezing an electronic handgrip dynamometer until they could no longer maintain 50% of …
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The Assessment of Autonomic Function in Young Adults with an Elevated Risk of Metabolic Syndrome
… during 8 minutes of rhythmic handgrip at 25% maximal voluntary contraction (MVC), where HR, beat-by-by BP, and tissue oxygen saturation index (TSI) were recorded continuously. The change in mean arterial pressure vs the change in TSI were plotted to produce a slope quantifying the magnitude of …
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The Role of Dopamine on Central Neuromuscular Activation during Passive Hyperthermia
… passed. Neuromuscular responses, as indicated by maximal voluntary contraction (MVC) force, and voluntary activation (VA) percentage were assessed prior to drug ingestion, 1 hour after MPH wash-in, throughout the heating protocol and at cessation of heating. A primary non-significant finding of …
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The surface electromyography-force relationship during isometric dorsiflexion in males and females
… males and 50 females) performed three isometric contractions at 20, 40, 60, 80, and 100% of maximal voluntary contraction (MVC) in an apparatus designed to isolate the action of the dorsiflexors. The surface EMG signal was amplified (lOOOx), band-pass filtered (10-500Hz), and sampled at 2048 Hz. …
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An Electromyographical Analysis of Shoulder and Trunk Muscles During Chest Press on Stable and Unstable Platforms
… that this discrepancy is caused by a co-contraction mechanism at the glenohumeral joint, favoring joint stability over force production. The purpose of this study was to examine the effect of instability on agonist, antagonist, and core musculature during the supine chest press. …
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Effect of Electrode Size, Shape, and Placement on Electrical Current and Subject Comfort During Electrical Stimulation
… of each extremity. After determining the maximal voluntary contraction (MVC) of the muscle and careful determination of the motor point, ES, with a biphasic square wave of 300 ms duration and a frequency of 30 Hz, was used to bring the muscle to 10% MVC. Subject tolerance to ES was …
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The Effect of Positioning on Pelvic Floor Muscle Activity as Evaluated with Surface Electromyography in Normals
… biofeedback. Practitioners compare resting tone, maximal contraction, and muscle endurance measures before and after pelvic floor exercise instruction to determine intervention and demonstrate progress. There is little research that supports the use of biofeedback in positions other than supine. …
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The effects of prostaglandin inhibition on the sympathetic and pressor responses to muscular contraction and postcontraction muscle ischemia
… responses to isometric handgrip (HG) at 40% of maximal voluntary contraction (MVC) to exhaustion and postcontraction muscle ischemia (PC). To accomplish this heart rate (HR), arterial pressure (n=10) and plasma norepinephrine (NE) levels (n=8) were measured in 10 healthy male subjects during HG …
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The effect of velocity of contraction on the repeated bout effect
… at the same compared to a different velocity of contraction as well as at a fast or slow velocity. Thirty-one right handed participants were randomly assigned to perform an initial unilateral bout of either fast (180°/s) or slow (30°/s) maximal isokinetic ECC elbow flexion. Three weeks later 16 …
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Factors associated with stiff knee gait in cerebral palsy
… hip flexors and hip extensors was recorded via maximal voluntary contraction using a dynamometer. Passive and stretch-mediated stiffness of the knee extensors was also recorded using a dynamometer with two set stretch speeds. The main findings highlight that several factors are correlated with …
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Toward the Optimal Waveform for Electrical Stimulation
… bouts of electrically stimulated isometric contractions equal to 10% of the maximal voluntary contraction (MVC) of their right quadriceps muscle to study subjective comfort and physiological responses to different waveforms, including Russian, interferential, sine, and square. Frequency …
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The effects of amlodipine on exercise performance in mild to moderate essential hypertensives
… was to determine the effects of amlodipine on maximal (MAX), prolonged submaximal (PSX) and on skeletal muscle function (SMF) in patients with mild hypertension. In a double-blind randomised crossover trial, ten physically active hypertensive patients performed i) graded exercise to exhaustion …
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Critical analysis of techniques for normalising electromyographic data : from laboratory to clinical research
… method of normalisation. The isometric maximal voluntary contraction (MVC) has been used as a standardmethod of normalisation for both static and dynamic exercises. However, researchers have recently improved the methods of normalisation by developing alternative techniques for the …
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The effect of acute low-load resistance exercise with the addition of blood flow occlusion on muscle function in children and adults
… the effect of low-load exercise with BFO on maximal voluntary contraction (MVC) and electromyographical (EMG) activity in children and adults. Methods: 16 men (24.4±2.5y) and 14 boys (10.7±2.0y) performed two experimental conditions: (1) occlusion and (2) control. During the occlusion …
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Effects of isometric elbow flexion on electromyographic spike analysis
… years), generated three 5-second isometric step contractions at each force level of 40, 60, 80, and 100 percent of maximal voluntary contraction (MVC). The presentation of the contractions was balanced across subjects. The right arm of the subject was positioned in the sagittal plane, with the …
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Hemodynamic Responses to Isometric Contractions of the Finger Flexor and Leg Extensor Muscle Groups in Men 18-30 and 50-70 Years of Age
… extension tests at 15, 30, 45 and 60% of their maximal voluntary contraction (MVC) capacities. Heart rate and stroke volume were recorded continuously for the twenty-five second pre-exercise rest period and for the forty-five second contraction period. Systolic and diastolic blood pressures were …
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The Role of Vitamin D in Skeletal Muscle Function and Regeneration
… in significant improvements in the recovery of maximal voluntary contraction force following a bout of eccentric exercise. Implementing an in vitro model of muscle regeneration also identified potential cellular mechanisms for these observations: Muscle derived cells treated with a total amount …
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Neuromuscular factors contributing to reductions in muscle force after repeated, high-intensity muscular efforts
… production during repeated, forceful muscle contractions, including those that occur in the occupational, clinical and athletic settings. Fatigue during such efforts is likely to result from disturbances to multiple processes in the nervous system and muscle. However, previous research …
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