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Contractile response of cardiomyocytes from controls, AC, EX, and EXAC rats. A: individual recordings of traces of twitch peak force development [amplitude systolic motion (ASM)] and calcium transients (Ca2+T) using fura-2 in cardiomyocytes at a stimulation rate of 0.5 Hz. B: ASM-Ca2+T relations in the cardiomyocytes of the treated groups. The 2 heat-exposed groups show rightward shift of the curves.
