Seventeen professional Australian Rules Football players participated in outdoor football-specific skills ( @ @C , @ h ) and indoor strength ( @ @C , @ h ) sessions and slept ( @ nights ) and cycled indoors ( @ h ) in either normal air ( NORM , n = @ ) or normobaric hypoxia ( @ @ h/day , FiO@ @-@ @ % , corresponding to a simulated altitude of @-@ m , hypoxic ( HYP ) , n = @ ) .