Aims: Cardiopulmonary exercise test (CPET) is used to evaluate patients with chronic heart failure (HF) usually by means of a personalized ramp exercise protocol. Our aim was to evaluate if exercise duration or ramp rate influences the results. Methods and results: Ninety HF patients were studied (peak V̇O2: >20 ml/min/kg, n=28, 15-20 ml/min/kg, n=39 and O2 averaged 16.9±4.3*, 18.0±4.4 and 18.0±5.4 ml/min/kg for the 5-, 10- and 15-min tests, (*=pO2 and heart rate were lowest in 5-min tests regardless of HF severity. The ΔV̇O2/Δwork-rate was lowest in 5-min tests and highest in 15-min tests. At all ramp rates, ΔV̇O2/ Δwork-rate was lower for the subjects with the lower peak V̇O2. The V̇e/V̇CO2 slope and V̇O2 at anaerobic threshold were not affected by the protocol for any grade of HF. Conclusions: In chronic HF, exercise protocol has a small effect on peak V̇O2 and ΔV̇O2/Δwork but does not affect V̇O2 at anaerobic threshold and V̇e/V̇CO2 slope.
- Heart failure
- Oxygen consumption
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine