Electromyogram activity and mean power frequency in exercise-damaged human muscle.

Day, Stephen H., Donnelly, Alan E., Brown, Stephen J. and Child, Robert B. (1998) Electromyogram activity and mean power frequency in exercise-damaged human muscle. Muscle & nerve, 21 (7). pp. 961-963. ISSN 0148-639X

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Abstract

Eight volunteers performed two bouts of 50 voluntary maximal eccentric contractions of the knee extensors of one leg 3 weeks apart. During maximal voluntary isometric contractions performed at intervals after each bout, electromyogram (EMG) mean power frequency declined after bout one (P < 0.01 Duncan's test), whereas integrated EMG did not change after either bout. These results suggest that unaccustomed eccentric contractions produce a temporary reduction in mean muscle activation frequency during subsequent maximal isometric contractions.