Published in:
01-09-2010 | Review Article
Muscle fatigue: from observations in humans to underlying mechanisms studied in intact single muscle fibres
Authors:
Nicolas Place, Takashi Yamada, Joseph D. Bruton, Håkan Westerblad
Published in:
European Journal of Applied Physiology
|
Issue 1/2010
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Abstract
Prolonged dynamic exercise and sustained isometric contractions induce muscle fatigue, as manifested by decreased performance and a reduction in the maximum voluntary contraction force. Studies with non-invasive measurements in exercising humans show that mechanisms located beyond the sarcolemma are important in the fatigue process. In this review, we describe probable cellular mechanisms underlying fatigue-induced changes in excitation–contraction (E–C) coupling occurring in human muscle fibres during strenuous exercise. We use fatigue-induced changes observed in intact single muscle fibres, where force and cellular Ca2+ handling can be directly measured, to explain changes in E–C coupling observed in human muscle during exercise.