Volume change and pressure development in muscle during contraction

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Abstract
Volume changes recorded in isometric and isotonic twitches of gastrocnemius muscle are similar to those recorded in sartorius muscle. The major differences are the greater difficulty in approaching isometric recording conditions in the gastrocnemius muscle and the possibility that a portion of the volume change could be due to the compression resulting from internal pressure development. The volume change was a function of the length of the muscle and of the amount of tension developed at a given length. Since these factors influence (and axe influenced by) the state of the contractile component, at least a portion of the recorded volume changes are a function of the state of the contractile component. There is not sufficient agreement at present concerning the molecular changes accompanying a single twitch of striated muscle to ascribe the volume changes to particular molecular events.

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