title: Power spectral analysis of blood pressure fluctuations during sleep in normal and decerebrate cats.
abstract: Arterial blood pressure fluctuations during sleep were investigated with power analysis technique in both normal and decerebrate cats. In the initial postoperative stage lasting about 3 to 4 days, intact cats displayed, during paradoxical sleep, phasic increases in arterial blood pressure which were superimposed on a tonic hypotension. In the later chronic stage, however, the animals showed the phasic hypertension being superimposed on the background of a tonic hypertension. Regardless of these stages, the blood pressure during paradoxical sleep exhibited a 1/f-like spectrum, expressed by the power spectral density which is inversely proportional to the Fourier frequency f. On the other hand, a power spectral profile of the blood pressure during slow wave sleep presented a white noise-like pattern within the same frequency range of 0.1-0.01 Hz. After brainstem transections at the pontomesencephalic border, the cats exhibited consistently a sustained fall in blood pressure during paradoxical sleep and the power spectral density of the blood pressure displayed a white noise-like pattern throughout the survival periods of one month or more. These observations indicate that the blood pressure fluctuations in the 1/f spectrum during paradoxical sleep originate in rostral brain structures.
authors.affiliation: Département de Médecine Expérimentale, Université Claude Bernard, Lyon, France.
authors.forename: N
authors.initials: N
authors.lastname: Kanamori
authors.forename: K
authors.initials: K
authors.lastname: Sakai
authors.forename: H
authors.initials: H
authors.lastname: Sei
authors.forename: D
authors.initials: D
authors.lastname: Salvert
authors.forename: G
authors.initials: G
authors.lastname: Vanni-Mercier
authors.forename: M
authors.initials: M
authors.lastname: Yamamoto
authors.forename: M
authors.initials: M
authors.lastname: Jouvet
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000502:physiology*; D001933:Brain Stem / Q000502:physiology; D002415:Cats; D003655:Decerebrate State / Q000503:physiopathology*; D006339:Heart Rate; D006613:Higher Nervous Activity; D016548:Prosencephalon / Q000502:physiology; D012894:Sleep Stages / Q000502:physiology*