Key result
Maximum mechanical power output of lizard fast-twitch fibres increased from 20 W kg-1 at 15°C to 154 W kg-1 at 42°C, suggesting contractile events do not limit hindlimb cycle frequency at high temperatures.
Population
Fast-twitch fibres from the iliofibularis of the lizard Dipsosaurus dorsalis
Design
Preclinical
Authors
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Temperature-dependent power gains in lizard muscle extend ectotherm physiology; leaves open relevance to mammalian cardiac performance.
In Dipsosaurus dorsalis, maximum muscle power output increases with temperature, but at higher temperatures, contractile events no longer limit hindlimb cycle frequency during burst running.
Swoap et al. (1993) studied this question. Temperature variation (15°C to 42°C) was evaluated on Mechanical power output and optimal cycling frequency. Maximum mechanical power output of lizard fast-twitch fibres increased from 20 W kg-1 at 15°C to 154 W kg-1 at 42°C, suggesting contractile events do not limit hindlimb cycle frequency at high temperatures.
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