Figure 1
Hydrogen concentration (HC) in the blood before, during and after hydrogen (H 2 ) inhalation. HC (micromol/L) in the arterial(red) and venous (blue) blood before (5 min. before), during (0-30min.) and after (30 min to 60 min) H2 gas inhalation. Case1 (square marks) inhaled 4% H2 gas and case 2 (triangle marks) and case 3 (round marks) inhaled 3% H2 gas. The HC at the plateau level reached the equivalent values reported in the successful animal experiments. Presence of a hump in the descending venous blood concentration curve may indicate the source of extra H2, coming out of slow blood flow/slow release compartments such as muscle and skin.