Figure 4: The relative changes in blood muscle damage biomarkers from baseline values of eight healthy males. Note: (A–C) Serum CK activity, serum LDH activity, and number of white blood cell. Values are expressed as mean ± standard error, and were analyzed by paired t-test. CK: Creatine kinase; HG: molecular hydrogen-rich gas mixture; LDH: lactate dehydrogenase; n.s.: not significant; Placebo: normal gas.