Effect on the training after hypoxic condition for acclimatization to altitude

The aim of this study is to examine the adverse effects of hypoxic condition using by hypoxic device for the acclimatization to altitude. Eight untrained male volunteers (mean age 28.2 years old) participated in this study. Subjects alternated of breathing through the re-breathing device (ALTO2Lab, Douglas Pharmaceuticals, Auckland, NZ) for 60 min program (SpO2: 88-92 %). Training session started after a rest of 30 min (normoxia). Subjects did hand ergometer exercise (60 rpm) as training by using Angioergometer. Training session consisted of gradual increase load training (30 W, 60 W, 90 W ...). If hand ergometer decreases under the 54 rpm for 10 seconds, the training is finished (all out). This session is considered as hypoxic session. Subjects did the same training without the re-breathing device two weeks after or before the hypoxic session. This session is considered as normoxic session. We compared the heart rate (HR), blood lactate concentration (BLa) and ratings of perceived exertion (RPE) of the hypoxic session with those of normoxic session at each point. We also compared the exercise duration (ED). There were no significant difference between hypoxic session and normoxic session in the HR, BLa, RPE and ED. Thus, we concluded that the single hypoxic exposure (about 1 hour) don't have the adverse effect to the latter training.