Characteristics of food-entrained circadian rhythms in rats during long-term exposure to constant light.

Abstract

Rats possess a system of circadian oscillators that permit entrainment of circadian activity rhythms independently to 24 hr cycles of light-dark and food access. The nature of interactions between food- and light-entrainable oscillators was examined by observing the generation and persistence of food-entrained circadian rhythms in rats whose light-entrainable rhythms were eliminated by long-term exposure to constant light. Most of these rats showed a delayed generation of food-entrained rhythms and only one of eight animals showed persistence of food associated rhythms during a 4-day food deprivation test. Rats whose light-entrainable rhythms are eliminated by suprachiasmatic nuclei ablation show, in contrast, normal generation and persistence of food-entrained rhythms. The results suggested a disruptive influence of constant light on non-photic entrainment, possibly due to coupling forces between damped light-entrainable oscillators and the food-entrainable oscillators.

Cite this paper

@article{Mistlberger1990CharacteristicsOF, title={Characteristics of food-entrained circadian rhythms in rats during long-term exposure to constant light.}, author={Ralph E Mistlberger and Thomas A. Houpt and Martin Moore-Ede}, journal={Chronobiology international}, year={1990}, volume={7 5-6}, pages={383-91} }