Figure 5: Effects of the 2-week continuous intake of hydrogen-rich water on changes in blood levels during an incremental cycling exercise test in healthy humans (Experiment 2). Note: Pre and Post mean before and after 2 weeks of continuous intake of hydrogen-rich water (HW, left) and placebo water (PW, right). The blood samples were collected before (at rest), during (150 W), and immediately after the end of the exercise (Ex). 1 UCARR corresponds to 0.08 mg/dL H2O2. Values are expressed as the mean ± SE (n = 10 in each group), and were analyzed by a two-way repeated measures analysis of variance followed by Bonferroni's test for multiple comparisons. #P < 0.05, ##P < 0.01, vs. rest. BAP: Biological antioxidant potential, which is an index of antioxidant activity; d-ROMs: diacron reactive oxygen metabolites, which is an index of oxidative stress level.