"iDEAL" aging is associated with lower resting metabolic rate: The baltimore longitudinal study of aging

Jennifer A. Schrack, Nicolas D. Knuth, Eleanor M. Simonsick, Luigi Ferrucci

Research output: Contribution to journalArticle

Abstract

Objectives To assess the associations among age, health status, and resting metabolic rate (RMR) in a large population of older adults. Design Cross-sectional analysis. Setting Community-dwelling volunteers from the Baltimore Longitudinal Study of Aging (BLSA). Participants Persons aged 40 to 96 (mean 68.2 ± 11.0) who underwent a comprehensive physical examination, cognitive assessment, RMR testing, body composition assessment, and physical function testing during a 3-day clinic visit (N = 420). Measurements Participants were assigned to Insight into the Determination of Exceptional Aging and Longevity (IDEAL) or non-IDEAL categories based on health status. IDEAL participants were defined according to the absence of physical and cognitive impairments, chronic conditions and comorbidities, and blood profile abnormalities. A three-stage linear regression model was used to assess the relationship between RMR and age, using IDEAL classification as a predictor and adjusting for sex and body composition. Results Resting metabolic rate averaged 1,512.4 ± 442.9 kcal/d and was lower with older age (β = -8.55, P <.001). After adjusting for age, sex, and body composition, RMR was 109.6 kcal/d lower in IDEAL than non-IDEAL participants (P <.005). Conclusion Individuals who are fully functional and free of major medical conditions have lower RMR than those with disease and functional impairments. These findings suggest that health status plays a role in energy use and regulation independent of age and body composition and that elevated RMR may be a global biomarker of poor health in older persons.

Original languageEnglish (US)
Pages (from-to)667-672
Number of pages6
JournalJournal of the American Geriatrics Society
Volume62
Issue number4
DOIs
StatePublished - Jan 1 2014

Keywords

  • aging
  • comorbidities
  • resting metabolic rate

ASJC Scopus subject areas

  • Geriatrics and Gerontology

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