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. 2018 Apr 2;13(4):e0194750. doi: 10.1371/journal.pone.0194750

Fig 1. Schematic of the heart rate to performance curve (HRPC) and detection of the heart rate turn point (HRTP) during CPX testing, illustrating a regular HRPC (A) and an inverted HRPC (B).

Fig 1

The difference in HRPC translates to a lower heart rate at HRTP (HRHRTP) when given as percentage of the maximum heart rate (%HRmax) (difference 10%). kHR = degree and direction of the heart rate to performance curve. HRmax = maximum heart rate.