Key result
The steady speed of shortening for calcium-activated fast-twitch fibers was approximately two times greater than that for slow-twitch fibers (0.5 vs 0.2 Lo/sec), reflecting inherent differences in cross-bridge properties.
Absolute Event Rate: 0.5% vs 0.2%
The difference in shortening characteristics between slow and fast mammalian skeletal muscle fibers is due to inherent differences in their cross-bridge properties rather than internal milieu.
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Highlights intrinsic cross-bridge differences in skeletal fibers; leaves open translation to cardiac mechanics or human disease.
J. Gulati (1976) studied Normal skeletal muscle physiology. Fast-twitch (EDL) fibers vs. Slow-twitch (soleus) fibers was evaluated on Maximum velocity of shortening (Vmax) at 10°C. The steady speed of shortening for calcium-activated fast-twitch fibers was approximately two times greater than that for slow-twitch fibers (0.5 vs 0.2 Lo/sec), reflecting inherent differences in cross-bridge properties.
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