Table 1.
Baseline characteristics, exercise testing results, and measures upon arriving at 4100 m
| Index | Total (n = 99) | AMS (n = 47) | Non-AMS (n = 52) | P-value |
|---|---|---|---|---|
| Baseline characteristics | ||||
| Age (year, x ± s) | 26.9 ± 8.3 | 26.0 ± 7.7 | 27.6 ± 8.8 | 0.358 |
| Men [n(%)] | 67 (67.7) | 23 (48.9) | 44 (84.6) | < 0.001 |
| Women [n(%)] | 32 (32.3) | 24 (51.1) | 8 (15.4) | < 0.001 |
| Height (cm, x ± s) | 170.0 ± 6.1 | 168.4 ± 5.9 | 171.3 ± 6.1 | 0.019 |
| Weight (kg, x ± s) | 64.5 ± 9.5 | 62.0 ± 10.0 | 66.7 ± 8.6 | 0.014 |
| BMI (kg/m2, x ± s) | 22.3 ± 2.5 | 21.8 ± 2.7 | 22.7 ± 2.2 | 0.070 |
| Smoker [n(%)] | 38 (38.4) | 11 (23.4) | 27 (51.9) | 0.004 |
| HR at rest (beats/min, x ± s) | 73.2 ± 11.2 | 74.5 ± 10.9 | 71.9 ± 11.5 | 0.257 |
| SpO2 at rest (%, x ± s) | 97.1 ± 1.3 | 97.5 ± 1.2 | 96.8 ± 1.4 | 0.017 |
| SBP at rest (mmHg, x ± s) | 117.3 ± 12.1 | 117.2 ± 12.6 | 117.4 ± 11.8 | 0.937 |
| DBP at rest (mmHg, x ± s) | 73.5 ± 11.4 | 73.8 ± 12.3 | 73.4 ± 10.6 | 0.858 |
| After exercise testing | ||||
| SpO2 after exercise (%, x ± s) | 97.1 ± 1.2 | 96.9 ± 1.3 | 97.2 ± 1.1 | 0.130 |
| ΔeSpO2 (%, x ± s) | −0.1 ± 1.8 | −0.6 ± 1.7 | 0.4 ± 1.7 | 0.004 |
| After arriving at 4100 m | ||||
| SBP at HA (mmHg, x ± s) | 122.3 ± 14.8 | 118.2 ± 11.8 | 126.0 ± 16.3 | 0.008 |
| ΔhSBP (mmHg, x ± s) | 5.0 ± 15.4 | 1.0 ± 15.0 | 8.7 ± 15.0 | 0.013 |
AMS Acute mountain sickness, BMI Body mass index, HR Heart rate, SpO2 Pulse oxygen saturation, SBP Systolic blood pressure, DBP Diastolic blood pressure, Δe Change after exercise testing (from the pre-exercise level), Δh Change after arriving at 4100 m (from the 500-m level)