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Details van artikel 9 van 11 gevonden artikelen
| Titel: |
Light suppresses frequency and endogenous amplitude of the circadian system in nocturnal animals |
| Auteur: |
Witting, W. Boerma, D. Hoffen, G.C. Koster-Van Swaab, D. F. Mirmiran, M. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 26 (1995) nr. 5 pagina's 477-485 |
| Jaar: |
1995-11 |
| Inhoud: |
According to Aschoff s rule the period of free-running circadian rhythms of nocturnal animals lengthens with increasing constant ambient light intensity. The present study investigated Aschoff s rule in relation to the endogenous circadian temperature rhythm using a recently developed mathematical model. Rats were exposed to various ambient light conditions while their free-running sleep-wake and temperature rhythms were recorded continuously. The results show that both frequency and endogenous amplitude were suppressed by light, indicating that circadian rhythmicity may disappear as a result of a suppression of the endogenous rhythm at long circadian cycle lengths. Furthermore, different light conditions producing significantly different free-running periods were accompanied by virtually identical activity levels. Therefore, it is concluded that the effect of light on the free-running period is the result of a direct modulation of the circadian system, rather than of indirect action by altering levels of locomotor activity. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 11 gevonden artikelen
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