Serum 8-OHdG level at BEx and Day2. Abbreviations: 8-OHdG, 8-hydroxydeoxyguanosine; BEx, before exercise; Day2, 2nd day after exercise. Data are shown as means ± S.E. *P < 0.05 above the column with bar shows the significant difference analyzed by one-way ANOVA. ††P < 0.01 on the column without bar shows the significant difference compared to the respective values in the BEx by paired Student’s t-test.