Figure 2From: Minute ventilation and heart rate relationship for estimation of the ventilatory compensation point at high altitude: a pilot studyRepresentative subject #1 (male, 36 years). Exercise response variables in a representative subject at SL (empty circle) and at HA (filled circle). The black arrow indicates VCP; the white arrow indicates the θL. In this subject, a second and less evident breakpoint V ˙ E / HR that occurred at the HR value observed at θL was identifiable (see text for further comments).Back to article page