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Figure 2 End-tidal CO₂ pressure (PETCO₂) at rest and during exercise in relation to CO₂ output (CO₂), minute ventilation (E), tidal volume (VT), and respiratory rate (RR) at rest (R), during 20 W warming-up (WU), at anaerobic threshold (AT), at respiratory compensation point (RC), and at peak exercise (P) according to the NYHA functional class. Values are mean ± SE.