Abstract
Recently Fenn (1) (2) has investigated the quantitative relation between the energy liberated and the work performed by the isolated sartorius muscle of the frog. He has advanced a qualitative statement of the effect of shortening and lengthening of the muscle on its heat-production, viz., shortening during contraction or lengthening during relaxation produces more heat than the contraction allowed to proceed isometrically, while lengthening during contraction or shortening during relaxation gives out less heat. The present paper deals with a further investigation of this relation. Apparatus and methods. A pair of sartorius muscles of the frog was mounted in the combined thermopile and muscle chamber made by Fenn (1). The method of heat measurement and calibration was essentially the same as that of Hartree and Hill (3); some modification, however, was necessary.
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Schedule a callMore From: Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character
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