| 490 m | 2590 m | ||
| Day 1 | Day 1 | Day 2 | |
| Acute mountain sickness score# | 0.1 ± 0.2 | 0.3 ± 0.3* | 0.1 ± 0.1¶ |
| 6-MWD, m | 533 ± 83 | 473 ± 149* | 500 ± 112*¶ |
| Oxygen saturation, % | 94 ± 2 | 88 ± 6* | 89 ± 4* |
| PaO2, kPa | 8.9 ± 1.2 | 6.9 ± 1.1* | |
| PaCO2, kPa | 5.6 ± 0.6 | 5.0 ± 0.5* | |
Means±SD, n = 40. #Environmental symptoms questionnaire cerebral score ranges from 0 to 5 with increasing severity of acute mountain sickness. *P <0.05 vs. 490 m, ¶ P <0.05 vs. 2590 m, day 1.