Postmortem change of rabbit myofibrillar ATPase activity was investigated at varying concentrations of free calcium ions. At concentrations of free calcium ions higher than 10 −7 M the ATPase activity increased with increasing postmortem time, while at concentrations of free calcium ions lower than 10 −7 M no significant change of the ATPase activity was found during postmortem storage of muscle. A slight shift of the myofibrillar pCa‐dependent ATPase activity curve toward lower calcium ion concentration occurred during postmortem storage: the affinity of myofibrils for calcium ions increased during postmortem storage.
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Ikeuchi et al. (1978) studied this question.
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