Hyperoxia Improves Repeated-Sprint Ability and the Associated Training Load in Athletes.

This study investigated the impact of hyperoxic gas breathing (HYP) on repeated-sprint ability (RSA) and on the associated training load (TL). Thirteen team- and racquet-sport athletes performed 6-s all-out sprints with 24-s recovery until exhaustion (power decrement ≥ 15% for two consecutive sprints) under normoxic (NOR: FO 0.21) and hyperoxic (HYP: FO 0.