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Figure 1 End-tidal CO₂ pressure (PETCO₂) at rest and during exercise according to the NYHA functional class. There was a significant difference in the change of PETCO₂ during exercise among the four groups at each time point (one way-ANOVA at each time point: rest p = 0.0016, 20 W p = 0.0001, 30 W p = 0.0001, AT p = 0.0001, RC p = 0.0001, Peak p = 0.0001). AT indicates anaerobic threshold; RC = respiratory compensation point; P = peak exercise. Values are mean ± SE. *p < 0.05 versus controls.

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