Figure 2. Selected panels from incremental cardiopulmonary exercise test to evaluate metabolic and cardiocirculatory responses. In A-C, a 52-year-old woman with a normal BMI and chronic heart failure due to reduced ejection fraction shows a typical pattern of O2 delivery/utilization mismatch. See text for further details. In D-F, sex- and age-matched physiological responses in a healthy subject. ⩒O2: oxygen uptake; ⩒CO2: carbon dioxide output; peak: at peak exercise; WR: work rate; and GET: gas exchange threshold.
