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European Journal of Applied Physiology

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01-09-2016 | Original Article

Intensity-dependent EMG response for the biceps brachii during sustained maximal and submaximal isometric contractions

Authors: Joshua C. Carr, Travis W. Beck, Xin Ye, Nathan P. Wages

Published in: European Journal of Applied Physiology | Issue 9/2016

Abstract

Purpose

There have been recent attempts to characterize the mechanisms associated with fatigue-induced task failure. We compared the time to failure and the corresponding changes in the surface electromyogram (EMG) during sustained maximal and submaximal isometric force tasks.

Methods

EMG activity was measured from the biceps brachii of 18 male participants as they sustained either a maximal or submaximal (60 % MVC) isometric contraction of the dominant elbow flexors until force could not be maintained above 55 % MVC.

Results

Intensity-dependent patterns of change were observed for EMG amplitude and mean power frequency (MNF) between the two force tasks. Interestingly, the only significant predictor of failure time was the rate of change in EMG MNF during the submaximal task (r ² = 0.304). In addition, EMG amplitude at submaximal failure was significantly lower (p < 0.05) than the values obtained during MVC.

Conclusions

The patterns of EMG response emphasize the basis of neuromuscular fatigue and task dependency. Additionally, our data suggest that the EMG MNF should be used when monitoring the progression of local muscle fatigue.

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Title: Intensity-dependent EMG response for the biceps brachii during sustained maximal and submaximal isometric contractions
Authors: Joshua C. Carr
Travis W. Beck
Xin Ye
Nathan P. Wages
Publication date: 01-09-2016
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 9/2016
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-016-3435-6

At a glance: The STEP trials

Springer Medicine

Intensity-dependent EMG response for the biceps brachii during sustained maximal and submaximal isometric contractions

Abstract

Purpose

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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