Figure 2

Concentration of blood lactate during the constant-load exercise test at week 0 (solid line) and week 4 (dotted line) in MIIT (square) and HIIT (circle); data represented as mean ± SEM. There was a significant effect of time (p ≤ 0.05). The interaction between intensity and time was not significant (P = 0.09). MIIT: moderate-intensity interval training; HIIT: high-intensity interval training.