Figure 4
Curves of individual respiratory-gas and ventilatory parameters during the tests. (A) Peripheral oxygen saturation (SpO2). (B) Minute respiratory volume (VE). (C) Oxygen concentration in the air pocket (O2 pocket). (D) Carbon dioxide concentration in the air pocket (CO2 pocket). Dashed red line represents tests done breathing into an air pocket surrounded by snow density ≤ 250 kg/m3, solid blue line by snow density between 251–350 kg/m3 and dotted black line by snow density > 350 kg/m3 (n = 36 for A; n = 35 for B,C & D).
