A new method for measuring internal series compliance in frog fast muscle was developed and validated against Wilkie's quick-release method.
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Validates compliance measurement in frog muscle; leaves open extension to mammalian cardiac models.
Methods which have been used in the past for estimating internal series compliance are discussed. 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. The method is found to agree with Wilkie’s quick-release method, provided parallel elastic structures are not carrying significant tension at the transition.
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C. J. Pennycuick (1964) studied this question.
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