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

✍ Scribed by Stephen H. Day; Alan E. Donnelly; Stephen J. Brown; Robert B. Child

• Book ID: 101250668
• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 107 KB
• Volume: 21
• Category: Article
• ISSN: 0148-639X
• DOI: 10.1002/(sici)1097-4598(199807)21:7<961::aid-mus20>3.0.co;2-s

✦ Synopsis

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.