Comparison of ventilatory variables, arterial oxygen saturation (Sp,O2), heart rate and O2 pulse achieved during the last minute of a 6-min walk test (6MWT) and a cardiopulmonary exercise test (CPET) in 20 patients with pulmonary arterial hypertension
| 6MWT | CPET | p-value | |
| V′O2 mL·min−1·kg−1 | 14.2±0.6 | 12.9±0.7 | 0.0542 |
| V′O2 mL·min−1 | 978±68 | 900±71 | 0.1076 |
| V′CO2 mL·min−1 | 881±65 | 1024±85 | 0.0195 |
| RER | 0.90±0.02 | 1.15±0.02 | 0.00001 |
| V′E L·min−1 | 46.0±3.3 | 53.6±3.9 | 0.0095 |
| Heart rate beats·min−1 | 119±4 | 135±4 | 0.0010 |
| Sp,O2 % | 76±4 | 86±3 | 0.0006 |
| V′E/V′CO2 at AT | 50.5±2.3 | 48.7±2.1 | 0.0996 |
| O2 pulse mL·beat−1 | 8.5±0.6 | 7.0±0.6 | 0.0009 |
Data are presented as mean±se, unless otherwise stated. V′O2: oxygen uptake; V′CO2: carbon dioxide output; RER: respiratory exchange ratio; V′E: minute ventilation; Sp,O2: arterial oxygen saturation measured by pulse oximetry; AT: anaerobic threshold.