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Fatiguability and fibre composition of human skeletal muscle.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Laboratory for Biomechanics and Motor Control.
1976 (English)In: Acta Physiologica Scandinavica, ISSN 0001-6772, E-ISSN 1365-201X, Vol. 98, no 3, 318-22 p.Article in journal (Refereed) Published
Abstract [en]

The fatiguability of the quadriceps muscle was investigated in 10 male subjects (25-40 yrs), with inter-individual differences in fibre composition of their vastus lateralis muscles (range 25-65% fast twitch, FT, muscle fibres). Fatiguability was assessed as the decline in maximal force (in % of initial values) with 50 repeated isokinetic knee-extensions at fast angular velocity (3.14 rad/s). Each contraction lasted 0.5 s and the rest periods were about 0.7 s. Every subject was tested on two occasions and the standard deviation for a single determination of fatiguability was 1.4%. The decline in force after 50 contractions was on the average about 45%. The individual values varied, however, and a linear correlation was present between fatiguability and % FT fibres (r = 0.86, p less than 0.01). It was concluded that development of fatigue in human skeletal muscle performing repeated fast dynamic contractions with maximal effort was most marked in muscles with a high proportion FT fibres. This finding was in conformity with earlier results from animal skeletal muscle preparations.

Place, publisher, year, edition, pages
1976. Vol. 98, no 3, 318-22 p.
Identifiers
URN: urn:nbn:se:gih:diva-587PubMedID: 136865OAI: oai:DiVA.org:gih-587DiVA: diva2:173727
Available from: 2009-02-17 Created: 2009-02-16 Last updated: 2011-05-03Bibliographically approved

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