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The Journal of Neurophysiology Vol. 82 No. 6 December 1999, pp. 3590-3593
Copyright ©1999 by the American Physiological Society
RAPID COMMUNICATION
Department of Kinesiology and Applied Physiology, University of Colorado, Boulder, Colorado 80309-0354
Semmler, John G.,
Devin V. Kutzscher, and
Roger M. Enoka.
Gender Differences in the Fatigability of Human Skeletal Muscle. J. Neurophysiol. 82: 3590-3593, 1999. After participating in a 4-wk intervention that reduced normal
usage of the elbow flexor muscles, all six women, but only one of six
men, experienced a marked increase in the endurance time during a
low-force fatiguing contraction. The increase in endurance time was
associated with an altered pattern of muscle activation that did not
involve the commonly observed progressive increase in muscle activity.
Rather, the muscle activity comprised intermittent motor unit activity.
In those individuals who exhibited this behavior, the novel pattern of
muscle activity was only present immediately after 4 wk of limb
immobilization and not before the intervention or after 4 wk of
recovery. These findings suggest possible differences between women and
men in the adaptations of the neuromuscular system.
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