PremanonAltitudeStudy_05
Researcher Robby Jay (USA), left, helps study participant Zack Morrey (USA) up the steps of the Vallée de Joux Hospital in Le Sentier, Switzerland after the latter received a muscle biopsy on Oct. 9, 2010. The biopsy's, which extracted muscle tissue from the thighs of the athletes, were done two times to each participant to measure muscle structure and fatigue.