Effect of H
treatment on human sperm motility in each suspension. Seventeen sperm suspensions with a sperm viability rate > 20% were used. Sperm motility was determined before and after treatment with H2- or N2-mixed gases for 30 min. Sperm motility in 12 suspensions (dark blue) improved only with H2-mixed gas, in 4 suspensions (light blue) improved with both H2- and N2-mixed gases and in one suspension (pink) was not activated by both mixed gases. P-values were determined using paired t-test.