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October 2021

Food restriction alters the diurnal distribution of sleep in rats

Author(s): Kapas, L., Ping, T. S., Fang, J. D., Krueger, J. M.

Journal/Book: Physiol Behav. 1999; 67: the Boulevard Langford Lane, Kidlington, Oxford Ox5 1GB, England. Pergamon-Elsevier Science Ltd. 697-703.

Abstract: The purpose of the present study was to determine the effects of restricting food and water intake to the light period on sleep and brain temperature (T-br) Sprague-Dawley male rats were anesthetized and provided with electrodes and thermistors for electroencephalographic (EEG) and T-br recordings. Baseline recordings were performed after a 3-week recovery period. After baseline recordings, access to food and water was restricted (FWR) to the light period for 29 days. During FWR, the diurnal distribution of rapid-eye-movement sleep (REMS) and T-br were reversed, while the distribution of non-REMS (NREMS) between the dark and light periods was attenuated. Daily food and water intake, body weight, and the diurnal distribution of EEG slow-wave activity within NREMS remained unchanged. In a separate study, sham-operated and pinealectomized rats were studied in a similar manner. The sleep responses of pineal-ectomized and sham-operated rats to FWR were similar. Further, FWR did not affect melatonin levels in the sham-operated rats, thereby suggesting that the pineal gland does not mediate the effects of FWR on sleep.

Note: Article Krueger JM, Fac Med & Pharm, Dept Pharmacol, Casablanca, MOROCCO

Keyword(s): food intake; drinking; nonrapid-eye-movement sleep; thermoregulation; rapid-eye-movement sleep; EEG power density; pineal gland; melatonin; SINGLE NEURON ACTIVITY; SUPRACHIASMATIC NUCLEUS; CIRCADIAN-RHYTHMS; CORTICOSTERONE; HYPOTHALAMUS; LESIONS; PLASMA

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