عنوان مقاله [English]
Background and Aim: Green tea extract has been suggested as an effective antioxidant to reduce the oxidative stress following resistance exercise. The purpose of this study was to investigate theacute effect of green tea extract supplementation onthe oxidative and antioxidant indices after resistance exercise at moderate and high intensities in trained men. Materials and Methods: Eleven male resistance-trained wrestlers participated in a double-blind randomized placebo-controlled crossover design, including four 1-week treatment periods with placebo and green tea extract (900 mg daily). The participants performed two medium-intensity resistance and two high-intensity resistance, which were separated with 2-weak washout periods. The high-intensity exercise sessions included six exercises with six sets and four repetitions with ninety percent of 1RM, and the medium-intensity exercise sessions included six exercises with three sets and 10 repetitions with seventy percentof 1RM.Blood sampling conducted before and after the resistance training sessions for the measurement of oxidative and antioxidant indices. Regarding the non-normal distribution of data, the Kruskal-wallis test was used to statistical analyzes and the significance level was considered lower than 0.05%. Results: : No significant effect was observed between using green tea supplementation or placebo for the levels of Malondialdehyde, total antioxidant capacity or superoxide dismutase, neither with high nor with medium intensity exercise sessions. Conclusion: Green tea supplementation for one weak has no significant effect on oxidative and antioxidant indices after medium or high intensity resistance exercise sessions in male wrestlers.
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