Influence of calorie restriction on measures of age-related cognitive decline: role of increased physical activity.
Controversy exists as to whether lifelong 40% calorie restriction (CR) enhances, has no effect on, or disrupts cognitive function during aging. Here, we report the effects of CR versus ad-lib feeding on cognitive function in male Brown Norway x Fisher344 rats across a range of ages (8-38 months), using two tasks that are differentially sensitive to age-related cognitive decline: object recognition and Morris water maze (MWM). All ages performed equally in object recognition, whereas, as a group, CR rats were impaired. In contrast, there was an age-related impairment in the MWM that was attenuated by CR as measured by time in proximity with and latency to reach the platform. Distance to the platform, a more sensitive measure, was not affected by CR. Finally, CR resulted in an overall increase in physical activity, one of several behavioral confounders to consider in the interpretation of cognitive outcomes in both tasks.
Carter
Christy S
CS
Department of Aging and Geriatric Research, College of Medicine, University of Florida, 210 East Mowry Road, Gainesville, FL 32610, USA. ccarter@aging.ufl.edu
Leeuwenburgh
Christiaan
C
Daniels
Michael
M
Foster
Thomas C
TC
D000375:Aging / Q000523:psychology*; D000818:Animals; D031204:Caloric Restriction; D003071:Cognition; D004193:Discrimination Learning; D008297:Male; D018782:Maze Learning; D009043:Motor Activity; D053580:Muscle Strength; D051381:Rats; D011914:Rats, Inbred BN; D011916:Rats, Inbred F344; D017208:Rats, Wistar