Energy requirements in the eighth decade of life

Stéphane Blanc, Dale A. Schoeller, Douglas Bauer, Michelle E. Danielson, Frances Tylavsky, Eleanor M. Simonsick, Tamara B. Harris, Stephen B. Kritchevsky, James E. Everhart

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Knowledge of energy requirements among relatively healthy elderly is limited. Objectives: The objectives of the study were to measure total energy expenditure (TEE)-derived energy requirements in a biracial population of older adults without limitations to daily life and to test these empirical measures against national and international recommendations. Design: TEE (measured by the doubly labeled water method), resting metabolic rate (RMR), activity-related energy expenditure (AEE), and body composition were measured in 288 persons aged 70-79 y selected from the Health, Aging, and Body Composition Study. Results: TEE was lower in women (≈530 kcal/d; P < 0.0001) than in men because of the women's lower RMR and AEE. Fat-free mass explained the sex difference in RMR, but body weight failed to account for the women's lower AEE (≈1 kcal kg-1 ·d-1; P = 0.007). Blacks had lower TEE than did whites (≈100 kcal/d, P = 0.03), and that was explained by blacks' lower RMR. Physical activity level (TEE/RMR) did not differ significantly between sexes and races (1.70 ± 0.23). The World Health Organization (WHO) recommendations overestimated TEE by 10 ± 15% (P < 0.0001) in women but not in men, and the dietary reference intakes (DRIs) were accurate to 0 ± 14% (P = 0.1). Both WHO and DRI recommendations are based on an underestimated physical activity level, and WHO recommendations are based on overestimated RMR. Conclusions: This study of well-functioning older adults confirms the racial difference in energy metabolism and supports the use of the 2002 DRIs. Because the DRIs and WHO recommendations underestimated PAL, new predictive equations of energy requirements are proposed.

Original languageEnglish (US)
Pages (from-to)303-310
Number of pages8
JournalAmerican Journal of Clinical Nutrition
Volume79
Issue number2
DOIs
StatePublished - Feb 2004

Keywords

  • African Americans
  • Aging
  • Energy expenditure
  • Malnutrition
  • Obesity
  • Sex

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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