Table 1.
Baseline characteristics of the volunteers.
Figure 1.
Graph showing the SaO2 during the ascent and descent phases.
a P<0.01: compared with the altitudes of 2500 m, 3000 m, and 3500 m; b P<0.01: compared with the altitudes of 3000 m, 2500 m, 2000 m, and 1500 m.
Figure 2.
Graph showing the HR during the ascent and descent phases.
The change in HR during the ascent and descent phases had no significant relationship with altitude changes (P>0.05).
Table 2.
The incidence of symptoms associated with increasing altitude (n = 32).
Table 3.
The incidence rate of different symptom at different altitudes.
Table 4.
The VAS score of symptoms (n = 32).
Figure 3.
Repeated measure ANOVA between the altitude and VAS score.
GD: Gastrointestinal discomfort. There was no correlation between headache and gastrointestinal discomfort with altitude (e P>0.05, d P>0.05). Fatigue had a significant interaction with altitude (b P<0.05). The correlation between dizziness and the composite score with altitude was very significant (a P<0.01, c P<0.01).
Figure 4.
Scatter diagram of the visual analog scale (VAS).
Relationship between altitude and average VAS score. Dotted line A represents a score of 16 mm for the VAS; dotted line B = 22 mm and dotted line C = 33 mm.