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| Titel: |
The role of feeding time in the evolution of urinary rhythms in rats |
| Auteur: |
Poulis, Joan A. Roelfsema, Ferdinand van der Heide, Daan |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 20 (1989) nr. 2 pagina's 81-96 |
| Jaar: |
1989-05 |
| Inhoud: |
We investigated the impact of an eating-fasting cycle (E:F 4:20 h) on free-running urinary electrolyte excretion rhythms in intact male and female rats as well as hypophysectomized and adrenalectomized male rats. Under constant illumination both rats with intact vision and blind rats showed free-running rhythms. No differences in period were found between male and female rats, rats maintained under constant light and blind rats, and intact rats and either hypophysectomized or adrenalectomized rats. After the introduction of the EF schedule abrupt phase shifts occurred; the magnitude depended linearly on the phase angle difference with respect to the free-running state and the mid-time of food availability, except for sodium in hypophysectomized and adrenalectomized animals. Additional studies with blind male rats showed that after termination of the EF cycle the acrophases correlated reasonably well with the acrophases expected on the basis of forward extrapolation of the free-running rhythm. These experiments show that the phase shifts observed during periodic feeding are caused by masking and that for sodium an intact pituitary-adrenal system is required. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 8 van 8 gevonden artikelen
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