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Titolo:
Effects of square-wave and simulated natural light-dark cycles on hamster circadian rhythms
Autore:
Tang, IH; Murakami, DM; Fuller, CA;
Indirizzi:
Univ Calif Davis, Sect Neurobiol Physiol & Behav, Davis, CA 95616 USA UnivCalif Davis Davis CA USA 95616 Physiol & Behav, Davis, CA 95616 USA
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY
fascicolo: 4, volume: 45, anno: 1999,
pagine: R1195 - R1202
SICI:
0363-6119(199904)45:4<R1195:EOSASN>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYSTEM; RATS;
Keywords:
light-emitting diode; masking; activity; body temperature; dawn; dusk;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Fuller, CA Univ95616f Davis, Sect Neurobiol Physiol & Behav, 1 Shields Ave, Davis, CA Univ Calif Davis 1 Shields Ave Davis CA USA 95616 ve, Davis, CA
Citazione:
I.H. Tang et al., "Effects of square-wave and simulated natural light-dark cycles on hamster circadian rhythms", AM J P-REG, 45(4), 1999, pp. R1195-R1202

Abstract

Circadian rhythms of activity (Act) and body temperature (T-b) were recorded from male Syrian hamsters under square-wave (LDSq) and simulated natural(LDSN, with dawn and dusk transitions) Light-dark cycles. Light intensity and data sampling were under the synchronized control of a laboratory computer. Changes in reactive and predictive onsets and offsets for the circadian rhythms of Act and Tb were examined in both lighting conditions. The reactive Act onset occurred 1.1 h earlier (P < 0.01) in LDSN than in LDSq and had a longer alpha-period (1.7 h; P < 0.05). The reactive T-b onset was 0.7 h earlier (P < 0.01) in LDSN. In LDSN, the predictive Act onset advanced by0.3 h (P < 0.05), whereas the T-b predictive onset remained the same as inLDSq. The phase angle difference between Act and Tb predictive onsets decreased by 0.9 h (P < 0.05) in LDSN, but the offsets of both measures remained unchanged. In this study, animals exhibited different circadian entrainment characteristics under LDSq and LDSN, suggesting that gradual and abrupt transitions between light and dark may provide different temporal cues.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 08:00:05