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This Article Full Text Full Text (PDF) All Versions of this Article: 292/1/E101    most recent 00127.2006v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (2) Citing Articles via Google Scholar Google Scholar Articles by Raman, A. Articles by Schoeller, D. A. Search for Related Content PubMed PubMed Citation Articles by Raman, A. Articles by Schoeller, D. A.

Influences of calorie restriction and age on energy expenditure in the rhesus monkey

¹Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, Wisconsin; ²Department of Molecular Biosciences, University of California-Davis, Davis, California; ³Wisconsin National Primate Research Center; ⁴Department of Physiology; ⁵Department of Medicine, University of Wisconsin-Madison, Madison, Wisconsin; and ⁶Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama

Submitted 16 March 2006 ; accepted in final form 26 July 2006

Caloric restriction (CR) is known to retard the aging process, and a marker of aging is decreased energy expenditure (EE). To assess longitudinal effects of CR on EE in rhesus monkeys (Macaca mulatta), data from 41 males (M) and 26 females (F) subjected to 9 or 15 yr of CR were studied. EE and body composition of monkeys 11–28 yr of age were measured using indirect calorimetry and dual X-ray absorptiometry. Total EE (24-h EE) was divided into daytime (day EE), nighttime (night EE), and daytime minus nighttime (D – N EE). M calorie-restricted monkeys showed a lower 24-h EE (means ± SD = 568 ± 96 kcal/day, P < 0.0001) than controls (C; 630 ± 129 kcal/day). Calorie-restricted M had a lower night EE (difference = 36 kcal P < 0.0001) compared with C M, but after adjusting for FFM and FM, night EE was not different between calorie-restricted and C males (P = 0.72). The 24-h EE decreased with age (13 kcal decrease/yr, P < 0.0001), but there was no difference between CR and C. Adjusted for FFM and FM, D – N EE decreased with age (9 kcal/yr, P < 0.0001), with no interaction with age (P = 0.72). The F were compared with age-matched M selected from the male cohort. F had a lower 24-h EE (496 ± 84 kcal/day) than M (636 ± 139 kcal/day) (P < 0.0001). Adjusting for FFM and FM, night EE was lower in F compared with M (difference = 18 kcal, P = 0.077). Night EE did not differ between calorie-restricted and C younger monkeys after adjusting for FFM and FM. In conclusion, CR did not alter the age-related decrease in EE with CR.

metabolic rate; dietary restriction; indirect calorimetry