Figure 4

Pv o ₂ from rest to peak exercise at sea level and PB = 347 mm Hg in one subject. At each altitude, during a simulated ascent of the Everest summit, Pvo₂ falls with increasing exercise intensity but is much lower at altitude than at sea level at any ${\dot{V}}_{\mathrm{O}2}$. At peak ${\dot{V}}_{\mathrm{O}2}$, Pvo₂ and ${\dot{V}}_{\mathrm{O}2}$ relate in direct proportion to one another (dashed line). Data from [25].