Prospective associations between ambulatory activity, body composition and muscle function in older adults

David Scott, L. Blizzard, J. Fell, G. Jones

Research output: Contribution to journalArticleResearchpeer-review

35 Citations (Scopus)

Abstract

To describe prospective associations between ambulatory activity (AA), body composition and muscle function in older adults, 697 community-dwelling participants (49% female; mean age=62 ± 7 years) were assessed for changes in body fat and leg lean mass using dual-energy x-ray absorptiometry, leg strength using dynamometer, and whole body muscle quality (WBMQ; an estimate of specific force) over 2.6 ± 0.4 years. AA was negatively associated with fat mass in both sexes but baseline AA did not predict change in fat mass. Habitual AA was weakly, but significantly, negatively associated with change in total body fat (-0.16kg/step × 10 3/day, P=0.011) and trunk fat (-0.12kg/step × 10 3/day, P=0.044) in men. Habitual AA was also weakly, but significantly, positively associated with change in leg lean mass in both men and women (both P3/day, P=0.001) and WBMQ (0.03kg/kg/step × 10 3/day, P=0.002) in women only. Partial R 2s for these associations were in the range of 1.2-3.2%. Although, these associations are modest, increases in objectively assessed physical activity may represent a target for improving body composition and muscle function in community-dwelling older adults.

Original languageEnglish
Pages (from-to)e168 - e175
JournalScandinavian Journal of Medicine & Science in Sports
Volume21
Issue number6
DOIs
Publication statusPublished - Dec 2011
Externally publishedYes

Keywords

  • Body fat
  • Exercise
  • Muscle strength
  • Pedometer

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