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Related Experiment Videos

Developmental changes in calcium kinetics in children assessed using stable isotopes.

S A Abrams1, N V Esteban, N E Vieira

  • 1National Institute of Child Health and Human Development, Bethesda, MD.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|March 1, 1992
PubMed
Summary

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Children exhibit higher bone calcium accretion rates and larger exchangeable calcium pools than adults. Stable isotopes allow safe calcium kinetics evaluation across all age groups, revealing peak bone growth in adolescence.

Area of Science:

  • Bone metabolism research
  • Pediatric endocrinology
  • Calcium kinetics

Background:

  • Understanding calcium dynamics is crucial for bone health.
  • Previous studies utilized radiotracers, limiting applicability in certain populations.
  • Stable isotopes offer a safer alternative for calcium kinetic studies.

Purpose of the Study:

  • To quantify total exchangeable calcium pool size (TEP) and bone calcium accretion rate (Vo+) in healthy children and young adults.
  • To compare calcium kinetics between children and adults using stable isotopes.
  • To establish the safety and efficacy of stable isotopes for calcium kinetic assessments.

Main Methods:

  • Intravenous administration of stable isotopes (42Ca or 46Ca) to pediatric and adult subjects.

Related Experiment Videos

  • Determination of calcium kinetic parameters via two- or three-exponential curve fitting of serum and urine tracer data.
  • Comparative analysis with existing radiotracer kinetic studies.

    • Main Results:

    • Significantly higher bone calcium accretion rate (Vo+) in children (3-16 years) compared to adults (2.8 +/- 1.6 vs. 0.7 +/- 0.2 g/day).
    • Both TEP and Vo+ showed significant positive correlation with age, independent of body weight.
    • The ratio of bone calcium accretion to exchangeable calcium pool (ko+) was markedly higher in children than adults (0.36 +/- 0.15 vs. 0.12 +/- 0.03 day-1).

    Conclusions:

    • Children demonstrate substantially greater bone calcium flow and larger exchangeable calcium pools than adults.
    • Peak bone calcium accretion and pool size may occur during early adolescence.
    • Stable isotopes provide a safe and effective method for evaluating calcium kinetics in all age groups, including pediatric populations.