Figure 4: Effects of the 2-week continuous intake of hydrogen-rich water on the peak load and peak oxygen uptake 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) or placebo water (PW). Δ means each difference in peak load and peak oxygen uptake (VO2peak) from before to after 2-week intake of experimental water. An analysis of the simple main effect was performed in VO2peak since the interaction was significant. Values are expressed as the mean ± SE (n = 10 in each group), and were analyzed by either a two-way repeated measures analysis of variance followed by analysis of the simple main effect (A and C), or an unpaired t-test (B and D). *P < 0.01, vs. Pre.