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Related Experiment Videos

Changes in spine and radius bone density during long-term hormone replacement.

J M Blake1, E D Ryan, L F Beaumont

  • 1Department of Obstetrics and Gynecology, McMaster University, Hamilton, ON, Canada.

Canadian Journal of Physiology and Pharmacology
|October 27, 1999
PubMed
Summary

Calcium and hormone replacement therapy (HRT) impact bone density in postmenopausal women. Moderate-dose HRT with calcium preserved radius bone and increased spine bone mineral density over seven years.

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Area of Science:

  • Endocrinology
  • Bone Biology
  • Gerontology

Background:

  • Postmenopausal osteoporosis is a significant health concern.
  • Hormone replacement therapy (HRT) is a common intervention for managing menopausal symptoms and bone loss.
  • Long-term effects of calcium supplementation and varying doses of HRT on bone mineral density (BMD) require further investigation.

Purpose of the Study:

  • To assess the long-term effects of calcium supplementation alone versus calcium with low- or moderate-dose hormone replacement therapy (HRT) on bone mineral density.
  • To determine the specific impact of different HRT doses on lumbar spine and radius BMD over a seven-year period.

Main Methods:

  • A longitudinal study involving 48 postmenopausal women over seven years.
  • Participants were divided into three groups: calcium only, calcium with low-dose HRT, and calcium with moderate-dose HRT.

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  • Bone mineral density (BMD) was measured repeatedly at the lumbar spine and mid-radius.

    • Main Results:

    • The calcium-only group showed a loss of bone mineral mass at the radius, while spine BMD was preserved.
    • Low-dose HRT combined with calcium supplementation preserved bone mineral mass at the radius.
    • Moderate-dose HRT with calcium supplementation increased bone mineral mass at the lumbar spine and preserved it at the radius.

    Conclusions:

    • Calcium supplementation alone may preserve spine bone density but not radius bone density in postmenopausal women.
    • Hormone replacement therapy, particularly at moderate doses, offers significant benefits for bone health, preserving radius BMD and enhancing spine BMD.
    • These findings support the role of HRT in long-term osteoporosis prevention strategies for postmenopausal women.