PremanonAltitudeStudy_06
Study participant Zack Morrey (USA), with an arterial catheter in his right wrist, takes a lunch break between stationary bicycle Vo2 max arterial tests at the Vallée de Joux Hospital in Le Sentier, Switzerland on Oct. 9, 2010. Vo2 max tests, which measure the maximum capacity an athlete has to transport and use oxygen, are done by incrementally increasing the resistance on a stationary bicycle until the athlete can no longer pedal.