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Electromyogram activity and mean power frequency in exercise‐damaged human muscle
Author(s) -
Day Stephen H.,
Donnelly Alan E.,
Brown Stephen J.,
Child Robert B.
Publication year - 1998
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/(sici)1097-4598(199807)21:7<961::aid-mus20>3.0.co;2-s
Subject(s) - isometric exercise , eccentric , electromyography , physical medicine and rehabilitation , medicine , eccentric exercise , physical therapy , anatomy , muscle damage , physics , quantum mechanics
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. © 1998 John Wiley & Sons, Inc. Muscle Nerve 21:961–963, 1998.