نتایج جستجو برای: voluntary isometric contraction

تعداد نتایج: 95169  

Journal: :پژوهش های آسیب شناسی زیستی 0
fariba ghaderi department of physical thraepy, faculty of rehabilitation, tabriz university of medical sciences, tabriz, iran amir masoud arab assistant professor, department of physical thraepy, university of social welfare and rehabilitation sciences, tehran, iran afsoon nodehi moghadam assistant professor, department of physical thraepy, university of social welfare and rehabilitation sciences, tehran, iran mehdi rahgozar assistant professor, department of biostatistics, university of social welfare and rehabilitation sciences, tehran, iran

objective: due to the frequent use of surface electromyography as a tool for the study of muscle function, to accurately compare electromyographic data from different muscles and different subjects, it is necessary to normalize the integrated data obtained from each muscle. the most common normalization technique is the use of maximum voluntary isometric contraction (mvic) of a predetermined is...

Journal: :journal of medical signals and sensors 0
zohreh jafari mehdi edrisi hamid reza marateb

the purpose of this study was to estimate the torque from high‑density surface electromyography signals of biceps brachii, brachioradialis, and the medial and lateral heads of triceps brachii muscles during moderate‑to‑high isometric elbow flexion‑extension. the elbow torque was estimated in two following steps: first, surface electromyography (emg) amplitudes were estimated using principal com...

2016
Sang-Yeol Lee Marg-Eun Jo

[Purpose] Maximum voluntary isometric contraction can increase the reliability of electromyography data by controlling respiration; however, many studies that use normalization of electromyography data fail to account for this. This study aims to check changes in maximum voluntary isometric contraction based on changes in posture and respiration conditions. [Subjects and Methods] Twenty-two hea...

Journal: :Neuromuscular disorders : NMD 2003
J Visser E Mans M de Visser R M van den Berg-Vos H Franssen J M B V de Jong L H van den Berg J H J Wokke R J de Haan

Context. Maximal voluntary isometric contraction, a method quantitatively assessing muscle strength, has proven to be reliable, accurate and sensitive in amyotrophic lateral sclerosis. Hand-held dynamometry is less expensive and more quickly applicable than maximal voluntary isometric contraction. Objective. To investigate if hand-held dynamometry is as reliable and valid as maximal voluntary i...

2017
ETHAN C. HILL TERRY J. HOUSH CORY M. SMITH KRISTEN C. COCHRANE NATHANIEL D.M. JENKINS RICHARD J. SCHMIDT GLEN O. JOHNSON

The purpose of the present study was to examine the effects of 2 different work-to-rest ratios, but the same mean load, cycle time, and total duration of the exercise bout, on maximal voluntary isometric contraction torque and neuromuscular responses to fatiguing, intermittent, submaximal, isometric, forearm flexion muscle actions. Ten men performed 2 fatiguing protocols with different work-to-...

Journal: :Clinical biomechanics 2010
Randy J Schmitz Hyunsoo Kim Sandra J Shultz

BACKGROUND While the application of compressive joint loads and thigh muscle activity are associated with anterior tibial translation in vitro, less is known during early load acceptance in vivo. We investigated the effects of increasing axial loads on anterior tibial translation and thigh muscle activity in healthy knees during transition from non-weight bearing to early weight bearing. METH...

2013
Atsuki Fukutani Naokazu Miyamoto Hiroaki Kanehisa Toshimasa Yanai Yasuo Kawakami

Not only twitch torque but also the maximal voluntary concentric torque increases after a high-intensity contraction (conditioning contraction). The purpose of this study was to test the hypothesis that the increase in the maximal voluntary concentric torque induced by a conditioning contraction is prominent when tested at fast angular velocities conditions. Twelve healthy male participants per...

کریمی, صابره, سرائی‌پور, سلاله , نوری‌زاده دهکردی, شهره ,

Loudness of verbal commands affect the Voluntary motor response. It seems the more intensity of verbal command, the more muscle contraction force. The purpose of thisstudy was to investigate the hypothesized effect of verbal command loundness onmagnitude of a resulting voluntary isometric contraction of triceps brachi muscle. Thirthy five female subjectsbetween ages of 18-30 performed f...

Introduction: Electrical stimulation has been used for many years in rehabilitation medicine to prevent atrophy or to increase muscle strength, but the use of electrical stimulation for muscle strengthening in research and clinical practice has become increasingly popular in recent years. The quadriceps femoris is the thigh muscle group that suffers the greatest amount of atrophy. This study ai...

2015
Martin Behrens Anett Mau-Moeller Matthias Weippert Josefin Fuhrmann Katharina Wegner Ralf Skripitz Rainer Bader Sven Bruhn

This study investigated effects of caffeine ingestion (8 mg/kg) on maximum voluntary torque (MVT) and voluntary activation of the quadriceps during isometric, concentric and eccentric contractions. Fourteen subjects ingested caffeine and placebo in a randomized, controlled, counterbalanced, double-blind crossover design. Neuromuscular tests were performed before and 1 h after oral caffeine and ...

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