Abstract
Only a few studies in recent years have investigated the effects of electrical stimulation on fatigue factors1–3; others have noted possible manifestations of fatigue without specifically assessing them statistically.4,5 One of the difficulties in making valid conclusions from the results of, and in making comparisons among, these studies has been the failure to hold all but one electrical stimulation or training variable constant in order to assess the effects of intergroup differences in rest interval, relative magnitude of initial contractions (ie, percentage of maximal voluntary isometric contraction [%MVIC]) in a series of contractions, or contraction duration on force decrement of a number of successive contractions. The purpose of the study by Binder-Macleod and Guerin (Phys Ther. 1990;70:619–625) was to assess the effect of different electrical stimulation frequencies on the rate of fatigue.
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