Electromyogram activity and mean power frequency in exercise-damaged human muscle.
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.
Day
S H
SH
Muscle Research Group, School of Health Sciences, University of Wolverhampton, United Kingdom.
Donnelly
A E
AE
Brown
S J
SJ
Child
R B
RB
D000328:Adult; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D009046:Motor Neurons / Q000502:physiology; D009119:Muscle Contraction / Q000502:physiology*; D018485:Muscle Fibers, Skeletal / Q000473:pathology*; D018482:Muscle, Skeletal / Q000294:innervation / Q000473:pathology / Q000503:physiopathology*; D005082:Physical Exertion / Q000502:physiology*; D014836:Volition / Q000502:physiology