Preintervention ventilatory variables during stage 2 sleep and slow wave sleep
| Stage 2 | SWS | |
| PIF (l/min) | 26.9±1.9 | 27.5±1.7 |
| Vti (litres) | 0.56±0.03 | 0.56±0.03 |
| VI (l/min) | 7.9±0.4 | 8.0±0.4 |
| TI (s) | 1.8±0.1 | 1.8±0.1 |
| TE (s) | 2.5±0.1 | 2.4±0.1* |
| TTot (s) | 4.3±0.1 | 4.2±0.1* |
| FB (breaths/min) | 14.2±0.5 | 14.5±0.6* |
| ΔPepi (cm H2O) | −2.4±0.4 | −2.2±0.4 |
| SaO2 (%) | 95.8±0.3 | 95.8±0.3 |
| ETCO2 (mm Hg) | 42.0±0.9 | 42.0±0.9 |
| CPAP (cm H2O) | 11.0±0.8 | 11.0±0.8 |
Values are mean±SEM.
↵* p<0.05, stage 2 sleep vs SWS, n=10.
CPAP, continuous positive airway pressure; ETCO2, end-tidal CO2; FB, breath frequency; PIF, peak inspiratory flow; SaO2, arterial oxygen saturation; TE expiratory time; TI, inspiratory time; TTot, total breath time VI, minute ventilation; Vti, inspiratory tidal volume.