Neuromuscular fatigue differs following unilateral vs bilateral sustained submaximal contractions.

Details

Serval ID
serval:BIB_7865BAFCFBC1
Type
Article: article from journal or magazin.
Collection
Publications
Title
Neuromuscular fatigue differs following unilateral vs bilateral sustained submaximal contractions.
Journal
Scandinavian Journal of Medicine and Science in Sports
Author(s)
Matkowski B., Place N., Martin A., Lepers R.
ISSN
1600-0838 (Electronic)
ISSN-L
0905-7188
Publication state
Published
Issued date
2011
Volume
21
Number
2
Pages
268-276
Language
english
Notes
Comment inPeripheral fatigue alone does not explain the decision to terminate sustained muscular contractions with two limbs. [Scand J Med Sci Sports. 2010]
Abstract
The purpose of the present study was to compare the mechanisms of fatigue induced by a unilateral vs a bilateral submaximal isometric knee extension. Ten physically active men completed two experimental sessions, randomly presented. They were asked to maintain an isometric knee extension force corresponding to 20% of the maximal voluntary contraction (MVC) until task failure with one leg (unilateral) vs two legs (bilateral). MVCs were performed before and after the sustained contraction. Transcutaneous electrical stimuli were used to examine central (voluntary activation) and peripheral (peak doublet force at rest) fatigue on the exercised leg. Time to task failure was significantly shorter (P<0.05) for the bilateral (245 ± 76 s) compared with the unilateral task (295 ± 85 s). Unilateral MVC force and maximal voluntary activation losses were significantly greater (P<0.05) after the unilateral task than after the bilateral task. Peak doublet force was significantly reduced (P<0.01) after the unilateral task, but not after the bilateral task. The present results demonstrated that time to task failure of a submaximal fatiguing contraction may depend on the number of limbs involved in the task. The greater time to task failure with one leg may have induced greater contractile alterations and a larger MVC loss following the unilateral task.
Keywords
Adult, Analysis of Variance, Electric Stimulation, Electromyography, Femoral Nerve/physiology, Humans, Isometric Contraction/physiology, Knee/physiology, Male, Muscle Fatigue/physiology, Muscle, Skeletal/physiology, Physical Endurance/physiology, Time Factors, Young Adult
Pubmed
Web of science
Create date
19/09/2013 9:39
Last modification date
03/03/2018 18:29
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