Seventeen professional Australian Rules Football players participated in outdoor football-specific skills ( 32 1C , 11.5 h ) and indoor strength ( 23 1C , 9.3 h ) sessions and slept ( 12 nights ) and cycled indoors ( 4.3 h ) in either normal air ( NORM , n = 8 ) or normobaric hypoxia ( 14 1 h/day , FiO2 15.2-14 .3 % , corresponding to a simulated altitude of 2500-3000 m , hypoxic ( HYP ) , n = 9 ) .