Neuromuscular fatigue differs with biofeedback type when performing a submaximal contraction.

Details

Serval ID
serval:BIB_38B8F9FBB1FC
Type
Article: article from journal or magazin.
Collection
Publications
Title
Neuromuscular fatigue differs with biofeedback type when performing a submaximal contraction.
Journal
Journal of Electromyography and Kinesiology
Author(s)
Place N., Martin A., Ballay Y., Lepers R.
ISSN
1050-6411 (Print)
ISSN-L
1050-6411
Publication state
Published
Issued date
2007
Volume
17
Number
3
Pages
253-263
Language
english
Abstract
The aim of the study was to examine alterations in contractile and neural processes in response to an isometric fatiguing contraction performed with EMG feedback (constant-EMG task) when exerting 40% of maximal voluntary contraction (MVC) torque with the knee extensor muscles. A task with a torque feedback (constant-torque task) set at a similar intensity served as a reference task. Thirteen men (26+/-5 yr) attended two experimental sessions that were randomized across days. Endurance time was greater for the constant-EMG task compared with the constant-torque task (230+/-156 s vs. 101+/-32s, P<0.01). Average EMG activity for the knee extensor muscles increased from 33.5+/-4.5% to 54.7+/-21.7% MVC EMG during the constant-torque task (P<0.001), whereas the torque exerted during the constant-EMG task decreased from 42.8+/-3.0% to 17.9+/-5.6% MVC torque (P<0.001). Comparable reductions in knee extensors MVC (-15.7+/-8.7% for the constant-torque task vs. -17.5+/-9.8% for the constant-EMG task, P>0.05) and voluntary activation level were observed at exhaustion. In contrast, excitation-contraction coupling process, assessed with an electrically evoked twitch and doublet, was altered significantly more at the end of the constant-EMG task despite the absence of M-wave changes for both tasks. Present results suggest that prolonged contractions using EMG biofeedback should be used cautiously in rehabilitation programs.
Keywords
Adult, Electromyography, Feedback, Humans, Isometric Contraction/physiology, Knee/physiology, Male, Muscle Fatigue/physiology, Physical Endurance/physiology, Time Factors, Torque
Pubmed
Web of science
Create date
19/09/2013 8:50
Last modification date
20/08/2019 13:28
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