Maximal mitochondrial respiration (V̇max) was significantly correlated with peak oxygen uptake (peak V̇O2) (A, P < 0.01, r = 0.63) and with oxygen uptake at the ventilatory threshold (V̇O2 at VT; B, P < 0.01, r = 0.57) in normal subjects. Symbols indicating data points from individuals in each group: sedentary, ▴; active, ♦; athletic, ▵.