The values (means ± SD) of the different metabolic and perceptual responses of the athletes (n = 10) during the 3x3-min DP intervals in association with the different oxygen contents during the intervals and recovery periods.

a indicates significant difference to baselineb indicates significant difference to HoHo at the same time pointc indicates significant difference to HoHOX at the same time pointd indicates significant difference to NoNo at the same time pointNoNo: normoxia with normoxic recovery; NoHOX: normoxia with hyperoxic recovery; HoHo: hypoxia with hypoxic recovery; HoHOX: hypoxia with hyperoxic recovery.