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J Appl Physiol 65: 89-93, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 65, Issue 1 89-93, Copyright © 1988 by American Physiological Society

ARTICLES

Relationship between numbers and frequencies of stimuli in human muscle fatigue

S. J. Garland, S. H. Garner and A. J. McComas
Department of Neurosciences, McMaster University, Hamilton, Ontario, Canada.

The effect of stimulus frequency on the rate of muscle fatigue has been studied on dorsiflexor muscles of the human ankle. It was found that significantly fewer stimuli were required to abolish twitch and tetanic torque when the stimuli were delivered at 15 Hz rather than 30 Hz. At both stimulus frequencies twitch torque disappeared before tetanic torque. The difference in numbers of stimuli required for fatigue was not due to impaired excitation of muscle fibers at either of the two frequencies. At both stimulating frequencies, twitch fatigue appeared to be due to a defect in excitation-contraction coupling and/or the contractile machinery.


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