The different intracellular action potentials of fast and slow muscle fibres = Différences entre les potentiels d'action intracellulaires de fibres musculaires rapides et lentes

W. Wallinga, Frans L.H. Gielen, Peter Wirtz, Paul de Jong, Johannes F. Broenink

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    Abstract

    The time course of the intracellular action potential was studied quantitatively, because it is an important factor in the generation of electromyographic signals. In in vivo preparations of the m. EDL and m. soleus of the rat single motor units were stimulated and intracellular action potentials were recorded in muscle fibres belonging to those motor units. In this arrangement it was possible to relate the intracellular action potential to the fibre type. The intracellular action potentials of fast twitch glycolytic (FTG) EDL and of slow soleus fibres were described, using 8 characteristics. All characteristics but one differed significantly between the two fibre populations. Comparing characteristics of intracellular action potentials of FTG fibres with slow fibres, it is concluded that: the resting membrane potential is more negative; the amplitude of the action potential is larger; the maximum rates of depolarization and repolarization are higher; and the shape of the repolarization phase is more variable.
    Original languageUndefined
    Pages (from-to)539-547
    JournalElectroencephalography and clinical neurophysiology
    Volume60
    Issue number6
    DOIs
    Publication statusPublished - 1985

    Keywords

    • IR-69494

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