Inclusion Criteria:  Healthy (No neurological or cardiovascular disorders) Male or female No medication Non-smoker Between 18 and 35 years old Recreational athlete population; performance level 2 or 3 for men according to De Pauw et al. (2013)[29] and performance level 2 or 3 for woman according to Decroix et al. (2015) Non-acclimatized to altitude (at least 2 months)  Exclusion Criteria:  Injuries Acclimated to altitude Use of medication Use of caffeine and heavy efforts 24 hours prior each trial Not eating a standardized meal, the morning of each trial