Stokes G M, Milner A D, Newball E A, Smith N J, Dunn C, Wilson A J
Department of Child Health, Queen's Medical Centre, Nottingham, United Kingdom.
Eur J Pediatr. 1989 Jan;148(4):360-4. doi: 10.1007/BF00444134.
We have studied 12 healthy full-term babies, mean age 3.2 days, using physiological criteria--EEG, electrooculogram, electromyogram, respiratory regularity and visible movement--to assess sleep state, and a respiratory jacket to record changes in functional residual capacity (FRC). A total of 593 min of sleep data were analysed. Of the recordings, 39% were scored as quiet sleep, 40% as active and 21% as indeterminate sleep. The mean maximum variation in FRC overall was 29 ml (SD +/- 15.4 ml). Examination of these figures showed that FRC variations during sleep state changes were smaller than those seen within a defined sleep state. We conclude that changes in sleep state are not associated with variations in FRC.
