Fig 7. Correlations among Vo₂ at Fat_max, Vo2 _peak, running time until fatigue, and plasma lactic acid concentration during running at an inclination of 40°.

The running protocol was described in Fig 1. Linear correlations were analyzed between Vo_{2 peak} and Vo₂ at Fat_max (A), between Vo₂ at Fat_max and plasma lactic acid concentration (B), between Vo_{2 peak} and running time until Vo_{2 peak} (C), and between Vo₂ at Fat_max and running time until fatigue (D). Plasma lactic acid concentration was measured during running at a speed of 24 m/min at the inclination of 40° as described in Fig 6. The running protocol was described in Fig 1. Individual data are shown (n = 12).