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Abstract The properties have been examined of the undamped elastic component which lies in series with the contractile component of muscle. At higher tensions the elasticity is normal; the form of the load-extension curve as a whole must be largely due to the statistical distribution of tendon length in different fibres. The mechanical (elastic) energy of a contracting muscle is expressed graphically as a function of its tension. Even under completely isometric conditions this elastic energy is a significant fraction of the heat production in a twitch.
Archibald Vivian Hill (Mon,) studied this question.