Figure 2. Performance curves for lactate and heart rate during the incremental exercise test (IET). The three phases of lactate metabolism are separated by the first (LTP₁) and second lactate turn point (LTP₂). Values are means ± SD. Exercise intensities for both HIIE modes and CE were set with respect to P_LTP1, P_LTP2, and P_max from IET. Arrow a represents P_mean for all three exercise protocols; arrow b represents P_peak for long HIIE; arrow c represents P_peak for short HIIE. La, blood lactate; HR, heart rate; 1^st st., first workload step; P_max, maximum power output; rec, recovery.