Vigilance states, EEG spectra, and cortical temperature in the guinea pig.
Details
Serval ID
serval:BIB_6CED58CE213A
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Vigilance states, EEG spectra, and cortical temperature in the guinea pig.
Journal
American Journal of Physiology : Regulatory, Integrative and Comparative Physiology
ISSN
0002-9513[print], 0002-9513[linking]
Publication state
Published
Issued date
06/1993
Volume
264
Number
6 Pt 2
Pages
R1125-R1132
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Publication Status: ppublish
Abstract
Vigilance states, electroencephalogram (EEG) power spectra (0.25-25.0 Hz), and cortical temperature (TCRT) were obtained in nine guinea pigs for 24 h in a 12:12-h light-dark (LD 12:12) schedule. Sleep was markedly polyphasic and fragmented and amounted to 32% of recording time, which is a low value compared with sleep in other rodents. There was 6.8% more sleep in the light period than in the dark period. EEG power density in non-rapid eye movement (NREM) sleep showed no significant temporal trend within the light or the dark period. The homeostatic aspects of sleep regulation, as proposed in the two-process model, can account for the slow-wave activity (SWA) pattern also in the guinea pig: The small 24-h amplitude of the sleep-wakefulness pattern resulted in a small, 12% decline of SWA within the light period. In contrast to more distinctly nocturnal rodents, SWA in the dark period was not higher than in the light period. TCRT showed no difference between the light and the dark period. TCRT in REM sleep and waking was higher than TCRT in NREM sleep. TCRT increased after the transition from NREM sleep to either REM sleep or waking, and decreased in the last minute before the transition and after the transition from waking to NREM sleep. Motor activity measured in six animals for 11 days in constant darkness showed no apparent rhythm in three animals and a significant circadian rhythm in three others. Our data support the notion that guinea pigs exhibit only a weak circadian rest-activity rhythm.
Keywords
Animals, Arousal, Body Temperature, Cerebral Cortex/physiology, Circadian Rhythm, Electroencephalography, Guinea Pigs, Male, Wakefulness
Pubmed
Create date
24/01/2008 16:31
Last modification date
20/08/2019 15:26