Figure 2: Time courses in changes of various water-property parameters. Note: (A–D) The time course of DH (A), ORP (B), DO (C), and pH (D) values in hydrogen-rich water generated by alternating current-electrolysis of tap water. The pH values were stable between 7.7 and 7.9. Data were expressed as the means for three measurements. DH: Dissolved hydrogen; DO: dissolved oxygen; ORP: Oxidation-reduction potential.