Key result
During the first postnatal month, rabbit psoas muscle fibers transition from slow to fast shortening velocities, with a strong positive correlation between shortening speed and tension-generating ability at postnatal day 7.
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Rabbit skeletal muscle data warrant caution before clinical extrapolation; leaves open analogous transitions in human cardiac development.
Reiser et al. (1985) studied Fast-twitch muscle development. Maturation (developmental age) was evaluated on Maximum velocity of shortening, tension-generating ability, and myosin heavy chain composition. During the first postnatal month, rabbit psoas muscle fibers transition from slow to fast shortening velocities, with a strong positive correlation between shortening speed and tension-generating ability at postnatal day 7.
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