Key result
Neural stimulation increased phosphate content of the P-light chain in fast-twitch white muscle in a frequency-dependent manner, with lesser effects in fast-twitch red and slow-twitch muscles.
Population
Rat gastrocnemius (fast-twitch white, fast-twitch red) and soleus (slow-twitch) skeletal muscles in situ
Comparison
Neural stimulation (0.5 to 100 Hz) vs Different muscle fiber types and varying…
Design
Preclinical
Authors
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Supports frequency-dependent P-light chain phosphorylation in rat fast-twitch muscle; leaves open its role in human performance.
The physiological consequences of P-light chain phosphorylation, including isometric twitch tension potentiation, are most prominent in fast-twitch white skeletal muscle due to higher kinase and lower phosphatase activities.
Moore et al. (1984) studied this question. Neural stimulation vs. Different muscle types (fast-twitch white, fast-twitch red, slow-twitch) was evaluated on Phosphate incorporation into the phosphorylatable light chain of myosin. Neural stimulation increased phosphate content of the P-light chain in fast-twitch white muscle in a frequency-dependent manner, with lesser effects in fast-twitch red and slow-twitch muscles.
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