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Figure 4 Correlation between exercise capacity and muscle oxidative capacity. (A) The relation between myofibers oxidative capacity and peak oxygen uptake (VO2 peak) (ml·min–1·kg–1) of patients with chronic heart failure (CHF) (open circles) is shifted leftward from the normal relation in controls (sedentary subjects: open triangles; active controls: closed triangles). (B) The relation between myofibers oxidative capacity and VO2 (ml·min–1·kg–1) at ventilatory threshold (VT), taken as an index of endurance capacity, of CHF patients is also shifted leftward from the normal relation in controls (symbols as in A).