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Related Experiment Videos

[Calcium metabolism characteristics in microgravity].

A I Grigor'ev1, I M Larina, B V Morukov

  • 1State Scientific Center, Institute for Biomedical Problems, Moscow, Russia.

Rossiiskii Fiziologicheskii Zhurnal Imeni I.M. Sechenova
|October 8, 1999
PubMed
Summary

Long space flights alter cosmonaut calcium metabolism, increasing serum calcium and bone resorption. These changes persist long after return, impacting bone health and calcium balance.

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Area of Science:

  • Space Medicine
  • Human Physiology
  • Biochemistry

Background:

  • Spaceflight poses risks to astronaut health, particularly bone metabolism.
  • Understanding calcium exchange is crucial for mitigating long-duration spaceflight effects.

Purpose of the Study:

  • To analyze calcium exchange parameters in cosmonauts after long space flights.
  • To investigate the impact of spaceflight on calcium kinetics and bone remodeling.

Main Methods:

  • Analysis of blood serum calcium, parathyroid hormone (PTH), calcitonin, and osteocalcin levels.
  • Calcium kinetics research using stable isotopes in a subset of cosmonauts.
  • Mathematical modeling of calcium flow dynamics.

Main Results:

Related Experiment Videos

  • Increased total and ionized serum calcium post-flight, correlated with PTH increase and calcitonin decrease.
  • Elevated osteocalcin levels and increased bone resorption observed.
  • Reduced intestinal calcium absorption and altered urinary/intestinal excretion during and after flight.
  • Bone remodeling slowed, with resorption dominating, leading to negative bone balance.

Conclusions:

  • Long-duration spaceflight significantly disrupts calcium homeostasis and bone metabolism.
  • Impaired calcium absorption and altered excretion patterns persist months post-flight.
  • Spaceflight-induced bone loss is linked to decreased bone remodeling and increased resorption.