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Fatigue and EMG of repeated fast voluntary contractions in man.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Laboratory for Biomechanics and Motor Control.ORCID iD: 0000-0002-3612-449X
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Laboratory for Biomechanics and Motor Control.
1977 (English)In: Acta Physiologica Scandinavica, ISSN 0001-6772, E-ISSN 1365-201X, Vol. 101, no 2, 194-8 p.Article in journal (Refereed) Published
Abstract [en]

A fatigue test consisting of repeated fast maximal contractions of the left quadriceps muscle in an isokinetic apparatus was performed by 12 healthy male subjects (19-25 yrs). EMG signals recorded from the surface of the left vastus lateralis muscle, from which also biopsies were obtained for muscle fibre classification. Only minor changes were observed in the EMG variables despite a decrease in muscle strength performance, in terms of peak torque, work and power to about 50% of initial values after 100 contractions. The concomitantly obtained positive correlation between the increase in EMG/torque ratio and the individual percentage of fast twitch (FT) muscle fibres indicated that local factors in the muscle, primarily in FT fibres, were causing the development of fatigue during repeated dynamic contractions with high power outputs.

Place, publisher, year, edition, pages
1977. Vol. 101, no 2, 194-8 p.
Identifiers
URN: urn:nbn:se:gih:diva-835PubMedID: 920213OAI: oai:DiVA.org:gih-835DiVA: diva2:174800
Available from: 2009-02-25 Created: 2009-02-24 Last updated: 2016-11-17Bibliographically approved

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