History-dependence of muscle slack length in humans: effects of contraction intensity, stretch amplitude, and time

American Physiological Society
Publication Type:
Journal Article
Journal of Applied Physiology, 2020, 129, (4), pp. 957-966
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The slack length of a relaxed human skeletal muscle is not fixed; it can be modified by contraction and stretch. Contraction of the human vastus lateralis muscle at short lengths reduces the muscle’s slack length. Even very weak contractions are sufficient to induce this effect. The effect persists for at least 5 min but can be reduced or abolished with a large-amplitude passive stretch.
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