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Ventilation and pulse-oximetry studies in the three resting positions: (A) supine (red), (B) sitting (yellow), (C) standing (green) in 15 healthy high-altitude men at 3500 m of altitude. SaO2 = arterial oxygen saturation from pulse-oximeter, HR = heart rate, VE = ventilation, Body Temperature, Pressure water vapor Saturated (BTPS), ETCO2 = end-tidal carbon dioxide, ETO2 = end-tidal oxygen, FR = respiratory frequency.
