Journal
MUSCLE & NERVE
Volume 51, Issue 2, Pages 259-267Publisher
WILEY
DOI: 10.1002/mus.24305
Keywords
compensation; H-reflex; interpolated twitch; neuromuscular electrical stimulation; spinal reflex; triceps surae
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Introduction: We investigated synergistic muscle activity after fatigue of a single muscle in different joint positions. Methods: Two experimental groups (n=12 each) performed maximal voluntary contractions (MVCs) before and after fatiguing the gastrocnemius lateralis (GL), using neuromuscular electrical stimulation (NMES). Neuromuscular tests, including muscle activity during MVC, H-reflex, and twitch interpolation, were performed. One group completed the experiment in a knee-extended position with the second group in a knee-flexed position. Results: In the knee-flexed position, the muscle activity increased in non-stimulated synergistic muscles. In contrast, in the knee-extended position, muscle activity of the synergistic muscles remained unaltered. The MVC force remained unaltered in the flexed position and decreased in the extended position. Conclusions: Synergistic muscles compensate for the fatigued muscle in the flexed position but not in the extended position. Compensation mechanisms seem to depend on joint position. Muscle Nerve51: 259-267, 2015
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