Power Output and the Frequency of Oscillatory Work in Mammalian Diaphragm Muscle: the Effects of Animal Size | Zendy

John D. Altringham | Zendy; Iain S. Young | Zendy

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Power Output and the Frequency of Oscillatory Work in Mammalian Diaphragm Muscle: the Effects of Animal Size

Author(s) -

John D. Altringham,

Iain S. Young

Publication year - 1991

Publication title -

journal of experimental biology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.367

H-Index - 185

eISSN - 1477-9145

pISSN - 0022-0949

DOI - 10.1242/jeb.157.1.381

Subject(s) - diaphragm (acoustics) , work (physics) , power (physics) , quadrupedalism , stimulation , diaphragm muscle , muscle mass , anatomy , biology , mathematics , mechanics , physics , thermodynamics , acoustics , endocrinology , respiratory system , loudspeaker

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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