FIGURE 4

Schematic representation of a) the effects of a hypothetical intervention that increased the V′E-intercept (c) with no change in the V′_E–V′_CO2 slope (m) on ventilation (V′_E) and b) ventilatory equivalent for CO₂ (V′_E/V′_CO2) as a function of CO₂ output (V′_CO2) during rapid-incremental or ramp exercise for work rates where arterial CO2 tension (P_aCO2) is assumed to be stable. Solid profiles: pre-intervention; dashed profiles, post-ntervention.