Short light-dark cycles influence sleep stages and EEG power spectra in the rat.

Détails

ID Serval
serval:BIB_4771F35D0D96
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Short light-dark cycles influence sleep stages and EEG power spectra in the rat.
Périodique
Behavioural brain research
Auteur(s)
Alföldi P., Franken P., Tobler I., Borbély A.A.
ISSN
0166-4328
Statut éditorial
Publié
Date de publication
05/1991
Peer-reviewed
Oui
Volume
43
Numéro
2
Pages
125-131
Langue
anglais
Résumé
To investigate the influence of light on sleep and the electroencephalogram (EEG), chronically implanted rats were continuously recorded during a baseline day under 12-h light-12-h dark (LD 12:12) conditions, and an experimental day with short LD (LD 1:1) cycles. The percentage of non-REM sleep (NREMS) was higher and the percentage of REM sleep (REMS) lower in the 1-h light [corrected] intervals than in the 1-h dark intervals. The maximum of NREMS induction by 1-h light occurred in the habitual 12-h dark period (activity period), while the largest enhancement of REMS by 1-h darkness occurred in the second half of the habitual 12-h light period (rest period). The EEG of waking, NREMS and REMS was subjected to spectral analysis to determine the power density of the frequency components in the range of 0.25-25.0 Hz. The overall 24-h time course of the EEG-spectra in NREMS was similar under baseline and experimental conditions. Nevertheless, the spectra were modified by the short LD-cycle. In NREMS, the values in the middle and high frequencies (greater than 6 Hz in the rest period; greater than 11 Hz in the activity period) were lower in the 1-h light intervals than in the 1-h dark intervals. In contrast, activity in some frequency bands during waking and REMS was higher in the light than in the dark intervals. It is concluded that the short LD-cycle modulates the vigilance states and induces state-specific changes in the EEG, whereas circadian aspects of sleep are little affected.
Mots-clé
Animals, Arousal, Cerebral Cortex, Circadian Rhythm, Electroencephalography, Evoked Potentials, Light, Male, Motor Activity, Rats, Rats, Inbred Strains, Signal Processing, Computer-Assisted, Sleep Stages, Sleep, REM
Pubmed
Web of science
Création de la notice
24/01/2008 16:31
Dernière modification de la notice
03/03/2018 16:50
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