Figure 3. The relationship between ΔpH_a and RR with ascent to high altitude.

A, RR (Δ[HCO₃ ⁻]_a)/Δ$P_{\mathrm{aC}{\mathrm{O}}_2}$). B, ΔpH_a. A black circle indicates mean values. Delta values at each altitude are compared to baseline values (see Eqn (2)). ^*Statistically significant difference from 3440 m (P < 0.05). Days reported represent days of altitude exposure.