Abstract
AbstractA method of estimating muscle fatigue simply and quantitatively is desirable in rehabilitation and exercise training. This paper discusses a method that estimates the muscle fatigue quantitatively by using the evoked EMG. More precisely, the method is as follows. The superimposed M wave which is evoked by an electrical stimulation during the specified voluntary sustained contraction is measured at several muscle contraction levels. The relation between the instantaneous frequency (IF) at the feature point of the M wave and the mean power frequency (MPF), which is derived from the background muscle activity, is examined by using the MPF‐IF scatter diagram. The following results are obtained. When the muscle contraction level is low, there is no significant positive correlation or the correlation coefficient is negative between the MPF and IF. But when the muscle contraction level is high, there are cases in which a high positive correlation is observed, and cases in which no significant correlation is observed. It is suggested that muscle fatigue can be estimated quantitatively from the MPF‐IF scatter diagram and the coefficient of correlation between the MPF and IF. © 2002 Wiley Periodicals, Inc. Syst Comp Jpn, 33(6): 53–61, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.1132
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