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Figure 1 Principle of the determination of the inflection of the heart rate work performance curve by means of second degree polynomial fitting of the curve and calculation of slopes of the tangents at the first lactate turn point (LTP1) and maximal power output (Pmax). The differences of angles are given for a single subject with a negatively accelerated heart rate (left; kHR<0: downward deflection) and a positively accelerated heart rate (right; kHR>0: upward deflection).
