Exercise effects on bone mineral density: Relationships to changes in fitness and fatness

Kerry Stewart, Anita C. Bacher, Paul Hees, Matthew Tayback, Pamela Ouyang, Suzanne M Jan De Beur

Research output: Contribution to journalArticle

Abstract

Background: Weight loss typically reduces bone mineral density (BMD). Exercise may preserve or increase BMD even while reducing fatness. We examined the relationships among exercise-induced changes in fitness and fatness with BMD. Design: Randomized controlled trial conducted between July 1999 and November 2003. Participants: Men and women (n =115) aged 55 to 75 years. Intervention: Six months of exercise training. Main Outcome Measures: Fitness measured as peak oxygen uptake and muscle strength, body composition by anthropometry, dual-energy x-ray absorptiometry, and magnetic resonance imaging. Results: A total of 51 men and 53 women completed the trial. Exercise increased aerobic and strength fitness and lean body mass, and reduced general and abdominal obesity. BMD did not change among men in either group. Among women exercisers, there were reductions in total skeleton BMD (p =0.02) and greater trochanter BMD (p =0.02). By bivariate correlation, among women, increased femoral neck BMD was associated with increased aerobic fitness (p =0.01) and with reduced body weight (p =0.02) and BMI (p =0.02). In the final regression model, 13% of the change in femoral neck BMD was explained by the change in aerobic fitness (p

Original languageEnglish (US)
Pages (from-to)453-460
Number of pages8
JournalAmerican Journal of Preventive Medicine
Volume28
Issue number5
DOIs
Publication statusPublished - Jun 2005

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ASJC Scopus subject areas

  • Medicine(all)
  • Public Health, Environmental and Occupational Health

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