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The purpose of this study was to investigate the effect of exercise trainings, 12weeks Endurance and Muscle resistance training and Endurance training based on the changes of MDA and CAT, GPX concentrations which were known to be markers of antioxidant defense system. To accomplish this purpose, nine teen high school students was selected and chosen as the subjects and also were divided into 3 groups muscle resistance training group(MRT), endurance training(ET) group and control groups(CG). MRT and ET groups conducted their respective exercise trainings in 3 times a week for 3 months at 70~80% of 1RM and HRmax, respectively. The results were as follows :1. In MRT and ET group, MDA concentration in all-out stage was found to have a significant increased. 2. In MRT and ET groups, CAT concentration was found to have a significant difference in resting and all-out stages, respectively. before and after training.3. In MRT groups, GPX concentration was found to have a significant difference in all-out stages, and then ET group was also found to have a significant difference in resting and all-out stage. respectively. before and after training.As a result, it was found that and Muscle resistance training and endurance training increased not only MDA but antioxidant enzyme concentrations.