Force-velocity curves of oxidative and glycolytic parts of rat medial gastrocnemius muscle vary for concentric but not for eccentric activity

J.M. Rijkelijkhuizen, C.J. de Ruiter, P.A.J.B.M. Huijing, A. de Haan

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    The purpose of this study was to compare the force exerted by the rat medial gastrocnemius (GM) muscle with either fast oxidative or fast glycolytic parts active during concentric and eccentric contractions at different velocities. The proximal end of the GM contains mainly fast oxidative fibres and the distal end predominantly fast glycolytic fibres. Different parts of GM were activated by selective stimulation of nerve branches. Fast oxidative or fast glycolytic muscle parts of anaesthetised male Wistar rats were activated maximally. After assessment of concentric force/velocity (F/v) relations (n=11), some of the muscles were subjected to a fatiguing series of isometric contractions (n=5). Fast oxidative muscle parts showed a significantly lower mean (±SD) maximal power output (P
    Original languageEnglish
    Pages (from-to)497-503
    JournalPflügers Archiv European Journal of Physiology
    Volume446
    DOIs
    Publication statusPublished - 2003

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