We tried to investigate whether the power output during intermittent sprint cycling in hypoxia would increase by hyperoxic gas breathing during recovery phases. Six healthy subjects performed the intermittent sprint cycling (15 sec maximal cycling with 60 sec recovery) until exhaustion, in normoxia (N), hypoxia (H;14.2%O₂), and hypoxia with hyperoxic gas (32%O₂) breathing during recovery phases (HH). During exercise, we measured the changes in power output and heart rate. The numbers of repetition was higher in HH than H (p<0.05). The mean power output at each bout was higher in HH than H (ANOVA; p<0.05), but it was not significantly different between HH and N. We could conclude that the treatment of hyperoxic gas during recovery phase would enhance the exercise performance in sprint intermittent exercise in hypoxia.

DESCENTE SPORTS SCIENCE Vol.30/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE