Table 1.
Resting data during wakefulness and sleep on optimal CPAP
| Men | Women | |||
|---|---|---|---|---|
| Wake | Sleep | Wake | Sleep | |
| VI (l min−1)*† | 10.6 ± 0.4 | 9.2 ± 0.3 | 7.8 ± 0.4 | 7.2 ± 0.4 |
| VT (l) *† | 0.76 ± 0.05 | 0.65 ± 0.02 | 0.57 ± 0.06 | 0.49 ± 0.03 |
| FB (breaths min−1) | 14.7 ± 0.4 | 14.3 ± 0.3 | 15.2 ± 1.2 | 14.9 ± 0.6 |
| CPAP (cmH2O) | 11.9 ± 0.9 | 11.9 ± 0.6 | 8.6 ± 0.9 | 11.0 ± 1.2 |
| PIF (l s−1) *† | 0.69 ± 0.04 | 0.53 ± 0.02 | 0.51 ± 0.03 | 0.44 ± 0.03 |
| PET,CO2 (Torr) *† | 38.0 ± 1.3 | 41.6 ± 1.0 | 42.0 ± 0.8 | 44.0 ± 1.0 |
| PEPI (cmH2O) † | 2.8 ± 0.4 | 1.8 ± 0.2 | 2.0 ± 0.4 | 1.7 ± 0.2 |
| RUA,0.2 (cmH2O l−1 s) | 1.3 ± 0.3 | 0.9 ± 0.2 | 1.4 ± 0.4 | 1.6 ± 0.2 |
| RUA,MAX (cmH2O l−1 s) | 4.7 ± 1.6 | 2.4 ± 0.5 | 3.6 ± 0.8 | 2.9 ± 0.3 |
| EMGDI Phasic (% max) † | 17.3 ± 2.9 | 7.6 ± 0.9 | 12.8 ± 2.5 | 8.1 ± 2.0 |
| EMGDI Tonic (% max) † | 16.6 ± 4.2 | 14.9 ± 3.8 | 22.9 ± 10.2 | 17.7 ± 5.6 |
Inspired minute ventilation (VI), tidal volume (VT), breathing frequency (FB), continuous positive airway pressure (CPAP), peak inspiratory flow (PIF), end-tidal CO2(PET,CO2), minimum epiglottic pressure (PEPI), upper airway resistance measured at 0.2 l s−1 (RUA,0.2) and at minimum PEPI (RUA,MAX), and inspiratory phasic and expiratory tonic diaphragm electromyogram (EMGDI Phasic and Tonic) during resting wakefulness and stable sleep in 11 men and 11 women with obstructive sleep apnoea. Mean ±s.e.m. presented.
*
P < 0.05 men different to women,
†
P < 0.05 wake different from sleep. No gender-by-sleep state interaction effects were observed.