Table 3

 Muscle activity and ventilation during wakefulness, NREM sleep and REM sleep during passive ventilation

WakefulnessNREM sleepREM sleepp Value
NREM, non-rapid eye movement; REM, rapid eye movement; DIAEMG, diaphragm electromyogram; GGEMG, genioglossus electromyogram; TPEMG, tensor palatini electromyogram; Vt, tidal volume; Ve, minute ventilation; Sao2, oxygen saturation; Petco2, end tidal carbon dioxide tension.
Average muscle activity (% max)
    DIAEMG6.8 (1.6)6.4 (1.6)6.4 (1.6)0.273
    GGEMG1.6 (0.4)1.1 (0.4)1.0 (0.3)0.003
    TPEMG5.1 (2.2)3.0 (2.0)3.0 (2.0)<0.001
Vt (l)0.43 (0.0)0.41 (0.0)0.42 (0.0)0.278
Ve (l/min)7.8 (0.6)7.5 (0.4)7.8 (0.5)0.569
Sao2 (%)97.4 (0.2)96.7 (0.3)96.9 (0.4)0.014
Petco2 (mm Hg)40.7 (0.5)41.4 (0.7)42.1 (0.9)0.055