PMID: 8954288Jan 1, 1996Paper

Relationship between myoelectric and mechanical manifestations of fatigue in the quadriceps femoris muscle group

European Journal of Applied Physiology and Occupational Physiology
A F Mannion, P Dolan

Abstract

Fatigue is commonly defined as "the failure to maintain the required force". As such, it may be argued that the use of electromyographic (EMG) power spectral statistics to monitor muscle fatigue is inappropriate, because, during the maintenance of a submaximal force of contraction, EMG changes are readily observable in the absence of any decline in the muscle's mechanical output. However, it is possible that the EMG changes reflect the changing metabolic status of the muscle and hence its inability to generate its normal maximal force. The present study sought to examine whether the decline in EMG median frequency, which occurs during the maintenance of a submaximal force, is correlated with a reduction in the muscle's maximum force-generating capacity. The maximum voluntary contraction (MVC) of the knee extensors in ten young, healthy subjects was determined. On five separate occasions, randomly assigned forces of 20,30,40, 50 and 60% MVC were held to the limit of endurance. At intervals throughout the sustained contractions, subjects were required to rapidly generate an MVC for 1-2 s, then return to the fixed submaxial target force. Surface EMG signals were recorded throughout the contractions from the rectus femoris and vast...Continue Reading

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Dec 4, 2004·European Journal of Applied Physiology·Ilenia BazzucchiFrancesco Felici
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