Effect of H
treatment on human sperm motility. Damaged sperm suspensions (n = 35) were untreated or treated with H2- or N2-mixed gases for 40 min (a). Another sperm suspensions (n = 12) were treated with H2-mixed gases for the indicated times (b). Data are represented as means ± standard deviation (SD). ***P < 0.001, versus the untreated sperm suspension.