Shortening-induced inactivation of contraction may be a factor determining the length-tension relation at short muscle lengths.
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Shortening may disrupt activation in cardiac fibers; leaves open its role in human length-tension relations.
The myofibrils in an isolated muscle fiber remain straight during the early part of a lightly loaded contraction initiated by membrane depolarization, but, as shortening continues, myofibrils in the core of the fiber become wavy, which suggests that their activation has been interrupted by shortening of the fiber. This may be a factor determining the length-tension relation at short muscle lengths.
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Taylor et al. (1970) studied this question.
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