Incremental maximal exercise test
| NIVS group | Control group | |
| Patients n | 14 | 15 |
| Wmax watts | 56±26 (46±19) | 58±21 (40±14) |
| V′O2,peak L·min−1 | 0.96±0.38 (55±19) | 1.00±0.27 (54±17) |
| V′E,peak L# | 40.6±14.4 (94±19) | 38.1±10.0 (93±16) |
| Heart rate maximum beats·min−1 | 122±20 (82±13) | 117±16 (79±11) |
| Blood gases | ||
| Pa,O2 kPa rest/peak exercise | 9.8±1.2/8.3±1.8 | 9.8±1.4/7.9±1.3 |
| Pa,CO2 kPa rest/peak exercise | 5.2±0.7/5.8±0.8 | 5.4±0.8/5.7±0.7 |
| Sa,O2 % rest/peak exercise | 95±2/89±5 | 95±2/88±5 |
Data are presented as mean±sd (% predicted), except where otherwise indicated. #: Data are presented as mean±sd (% maximum voluntary ventilation). NIVS: noninvasive ventilatory support; Wmax: maximal workload; V′O2,peak: peak pulmonary oxygen uptake; V′E,peak: peak minute ventilation; Pa,O2: arterial oxygen tension; Pa,CO2: arterial carbon dioxide tension; Sa,O2: arterial oxyhaemoglobin saturation.