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Journal of Experimental Biology, Vol 157, Issue 1 381-389, Copyright © 1991 by Company of Biologists

JOURNAL ARTICLES

Power output and the frequency of oscillatory work in mammalian diaphragm muscle: the effects of animal size

JD Altringham and IS Young
Department of Pure and Applied Biology, The University, Leeds.

Bundles of muscle fibres were isolated from the diaphragm of mouse, rat and rabbit. Mean oscillatory power output was determined during phasic stimulation and imposed sinusoidal length changes. Maximum power output was measured over a range of cycle frequencies. The cycle frequency for maximum power output (fopt) decreased with increasing body mass and was described by the equation, fopt = 4.42M-0.16, where M is body mass. A very similar relationship has been reported between body mass and the frequency of the trot-gallop transition in terrestrial, quadrupedal mammals [Heglund et al. (1974), Science 186, 1112-1113), and the significance of this similarity is discussed.


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© The Company of Biologists Ltd 1991