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Loading and bone fragility.

Ego Seeman1

  • 1Endocrine Unit, Department of Medicine, Austin Hospital, University of Melbourne, Melbourne, Australia. egos@unimelb.edu.au

Journal of Bone and Mineral Metabolism
|June 30, 2005
PubMed
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Physical activity may reduce fracture risk, but bias is a concern. While exercise benefits bone health during growth and adulthood, long-term fracture reduction requires more robust evidence from randomized trials.

Area of Science:

  • Bone health and physical activity research
  • Gerontology and osteoporosis studies

Background:

  • Observational studies suggest physical activity is linked to lower fracture risk.
  • Potential for bias in existing research necessitates cautious interpretation.
  • Exercise during skeletal development may confer lasting benefits, but adult exercise effects are less certain.

Purpose of the Study:

  • To critically evaluate the evidence linking physical activity to fracture risk reduction.
  • To identify the limitations of current research and propose future study designs.

Main Methods:

  • Review of retrospective and prospective observational, and case-control studies.
  • Analysis of exercise effects on bone mineral density (BMD) and skeletal modeling.
  • Assessment of the need for prospective randomized controlled trials (RCTs).

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Main Results:

  • Existing data show an association between activity and reduced fractures, but bias is a significant confounder.
  • Exercise during growth can enhance skeletal strength, with potential for permanent effects.
  • Adult exercise may slightly increase BMD or slow bone loss; its impact on fracture rates in old age remains unproven.

Conclusions:

  • The hypothesis that exercise has no effect on fracture rates in old age cannot be rejected based on current data.
  • High-quality prospective randomized trials are needed to definitively establish the efficacy of exercise in preventing spine and hip fractures.
  • Open-label trials, while not blinded, are feasible and recommended for future research.