Figure 1

Study design indicating timing of baseline, SL, and HYP measurements in either HH or NH. One preliminary peak oxygen uptake, two preliminary cycle endurance tests consisting of two steady-state exercise bouts followed by a cycle time trial test, and five cycle exercise training sessions occurred during baseline testing. Prior to each cycle endurance test in SL and HYP, resting ventilatory, cardiovascular, and hematologic responses were measured.