Frog Fast Muscle: II. A Method of Measuring Internal Series Compliance

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Abstract
1. Methods which have been used in the past for estimating internal series compliance are discussed. 2. A new method is described in which measurements of (a) rate of change of tension, and (b) speed of shortening are made in the isometric and isotonic phases respectively of a contraction containing a transition from one type of contraction to the other. If the mechanical power output of the muscle is assumed the same just before and just after the transition, the total series compliance can be obtained. 3. The method is found to agree with Wilkie's quick-release method, provided parallel elastic structures are not carrying significant tension at the transition.