Oxidative stress in gastrocnemius after 8 weeks of intervention. Concentrations of a) MDA in gastrocnemius; b) SOD activity in gastrocnemius; and c) CAT activity in gastrocnemius. Values in mean ± SD; n = 10 for all groups. SED, sedentary rats; SED-Cr, sedentary supplemented with creatine rats; RT, resistance training rats; RT-Cr, resistance training supplemented with creatine rats. Two way ANOVA, followed by the post hoc test of Student Newman-Keuls. *P < 0.05 vs. SED.