Abstract
Sleep apnea occurs in humans and experimental animals. We examined whether it also arises in adult mice. Ventilation in male adult 129/Sv mice was recorded concomitantly by electroencephalograms and electromyograms for 6 h by use of body plethysmography. Apnea was defined as cessation of plethysmographic signals for longer than two respiratory cycles. While mice breathed room air, 32.3 +/- 6.9 (mean +/- SE, n = 5) apneas were observed during sleep but not in quiet awake periods. Sleep apneas were further classified into two types. Postsigh apneas occurred exclusively during slow-wave sleep (SWS), whereas spontaneous apneas arose during both SWS and rapid eye movement sleep. Compared with room air (9.1 +/- 1.4/h of SWS), postsigh apneas were more frequent in hypoxia (13.7 +/- 2.1) and less frequent in hyperoxia (3.6 +/- 1.7) and hypercapnia (2.8 +/- 2.1). Our data indicated that significant sleep apnea occurs in normal adult mice and suggested that the mouse could be a promising experimental model with which to study the genetic and molecular basis of respiratory regulation during sleep.
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Schedule a callMore From: Journal of applied physiology (Bethesda, Md. : 1985)
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