SUMMARY–Calcium uptake and Ca2+‐activated ATPase activity have been investigated in relation to pH, in pork muscle Longissimus dorsi, sampled 35 min postmortem. Both the rate of calcium uptake and the enzyme activity were negatively, and significantly, correlated with pH1, except when the latter value dropped below 5.9. At pH1<5.9, impairment of reticular function and of enzyme activity became apparent. As pH1is a guide to the rate of postmortem glycolysis, the significance of the findings is discussed with respect to accelerated glycolysis and the development of the PSE condition in p
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