Respiratory frequency as a function of preoptic temperature during sleep.
The effects on respiratory frequency of preoptic heating during slow-and fast-wave sleep were studied in freely moving cats. During slow-wave sleep, at neutral ambient temperature, the subliminal range of preoptic temperature for thermal polypnea extends to 0.2-0.4 degrees C above control preoptic temperature. During fast-wave sleep, at neutral ambient temperature, the subliminal range of preoptic temperature for thermal polypnea increases beyond 0.9-1.0 degrees C above control preoptic temperature. Moreover, the polypneic response is weak and unstable. The results show the suspension of a precise thermoregulatory control during fast-wave sleep in a homoiothermic species.
D000818:Animals; D001831:Body Temperature; D001833:Body Temperature Regulation; D001931:Brain Mapping; D002415:Cats; D007031:Hypothalamus / Q000502:physiology*; D011301:Preoptic Area / Q000502:physiology*; D012119:Respiration; D012890:Sleep / Q000502:physiology*; D012894:Sleep Stages / Q000502:physiology