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Infarcted area (scar area /left ventricular (LV) muscle area) among groups. *p<0.05 vs. control; §p<0.05 vs. ET+N; £p<0.05 vs ET. C = control; ET = exercise training; M = morphine; IR = intermittent ischemia-reperfusion; M+N = morphine plus naloxone; ET+M = exercise training plus morphine; ET+N = exercise training plus naloxone.
