Figure 1. Percentage of changes of the physiological variables after the training period. Data are reported as means±SD. HIIT: high-intensity interval training group; CON: control group; VO2max: maximal oxygen uptake; PTS: peak treadmill speed; OBLA: running speed associated with onset of blood lactate accumulation; RE: running economy measured at 12 km/h. *P<0.05 (unpaired t-test).
