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Related Experiment Videos

Calcium and osteoporosis.

B E Nordin1, K J Polley, A G Need

  • 1Department of Nutrition & Dietetics, Royal Adelaide Hospital, South Australia.

Annales Chirurgiae Et Gynaecologiae
|January 1, 1988
PubMed
Summary
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Menopause triggers exponential bone loss, potentially trabecular, merging into age-related cortical loss. Increased urinary calcium loss, not primary bone resorption, may drive this, suggesting calcium

Area of Science:

  • Endocrinology and Bone Metabolism
  • Calcium Homeostasis
  • Postmenopausal Health

Background:

  • Menopause-associated bone loss is initially exponential and trabecular, transitioning to linear, age-related cortical bone loss.
  • Increased obligatory urinary calcium loss, linked to filtered calcium load, occurs post-menopause.
  • Urinary hydroxyproline levels correlate with urinary calcium and sodium, suggesting bone resorption responds to calcium loss.

Purpose of the Study:

  • To investigate the relationship between calcium loss and bone resorption in postmenopausal women.
  • To explore the role of calcium deficiency in osteoporosis pathogenesis.
  • To assess the efficacy of calcium supplementation in preventing bone loss.

Main Methods:

  • Analysis of urinary calcium and hydroxyproline excretion.

Related Experiment Videos

  • Assessment of calcium absorption and malabsorption.
  • Evaluation of calcium supplementation effects on bone loss.

    • Main Results:

    • Osteoporotic women exhibit higher filtered calcium load and obligatory calcium loss, often with malabsorption.
    • Calcium administration or calcitriol can suppress urinary hydroxyproline in specific patient groups.
    • Calcium supplementation shows efficacy in inhibiting cortical bone loss but may be less effective for trabecular bone loss near menopause.

    Conclusions:

    • Bone resorption appears to be a response to calcium loss rather than a primary event.
    • Calcium deficiency's role in human osteoporosis is debated, though it causes it in animals.
    • Calcium supplementation effectiveness varies based on bone type, menopausal stage, and treatment parameters.