Key result
Endurance swimming for 12 weeks increased the percentage of permuted chain fibers expressing a novel myosin isoform from 0% to 19.2% in rat muscle spindles.
Population
Rat soleus (SOL) and extensor digitorum longus (EDL) muscles
Comparison
Endurance swimming vs Untrained state (baseline/control)
Design
Preclinical
Follow-up
Up to 12 weeks of training and 10 weeks post-training
Authors
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No immediate clinical implications in humans; leaves open the functional consequences of endurance-induced myosin plasticity in spindles.
Absolute Event Rate: 19.2% vs 0%
Endurance swimming induces the expression of a novel myosin isoform in nuclear chain fibers of rat muscle spindles.
Yoshimura et al. (1992) studied this question. Endurance swimming vs. Baseline/untrained state was evaluated on Percentage of permuted chain fibers (by myosin ATPase staining). Endurance swimming for 12 weeks increased the percentage of permuted chain fibers expressing a novel myosin isoform from 0% to 19.2% in rat muscle spindles.
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