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Am J Physiol Regul Integr Comp Physiol 271: R1514-R1520, 1996;
0363-6119/96 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 271, Issue 6 1514-R1520, Copyright © 1996 by American Physiological Society

ARTICLES

Aging affects development and persistence of feeding-associated circadian rhythm in rat plasma corticosterone

S. Honma, Y. Katsuno, H. Abe and K. Honma
Department of Physiology, Hokkaido University School of Medicine, Sapporo, Japan.

Effects of aging on development and persistence of feeding-associated circadian rhythm were examined with respect to the prefeeding plasma corticosterone peak under restricted feeding. Old (20 mo), middle-aged (12 mo), and young (2.5 mo) male rats were subjected to a restricted feeding schedule for 21 days in which free access to food was limited to 2 h/day in the light phase. Prefeeding corticosterone peak was detected 1 wk after the start of the schedule in the young and 3 wk after in the old and middle-aged rats. After the restricted feeding, a feeding/ fasting cycle composed of 7 days of ad libitum feeding and 3 days of fasting was imposed four times. The persistence of feeding-associated rhythm was evaluated by examining the reappearance of the corticosterone peak at the previous meal time during each fasting period of the feeding/fasting cycle. The corticosterone peak was not detected in the old and middle-aged rats even at the first cycle, but it was still distinct at the third cycle in the young rats. In conclusion, aging impaired the development and persistence of feeding-associated circadian rhythm in rats.


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