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Future human bone research in space

A LeBlanc1, L Shackelford, V Schneider

  • 1Baylor College of Medicine, Houston, TX, USA. aleblanc@bcm.tmc.edu

Bone
|May 26, 1998
PubMed
Summary

Astronauts experience significant bone density loss in space, with recovery taking years. Further research is crucial for developing effective countermeasures against spaceflight-induced bone demineralization.

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Area of Science:

  • Space medicine
  • Bone physiology
  • Human physiology

Background:

  • Spaceflight and prolonged bed rest induce negative calcium balance and bone demineralization.
  • Bone loss is not uniform across the skeleton, varying by individual and skeletal site.

Purpose of the Study:

  • To summarize current knowledge on bone density changes during spaceflight and bed rest.
  • To highlight the need for further research into spaceflight-induced bone loss mechanisms and countermeasures.

Main Methods:

  • Review of Skylab and long-duration Russian spaceflight data.
  • Analysis of bone density measurements (BMD) from various skeletal sites.
  • Comparison with data from long-duration bed rest studies.

Main Results:

  • Astronauts exhibit negative calcium balance (approx. -300 mg/day) and regional bone loss (1-1.6% in spine, femur, pelvis).
  • Bed rest studies show similar bone loss patterns, with decreased calcium absorption and altered vitamin D levels.
  • Bone recovery post-flight is slow, potentially taking years for complete restoration.

Conclusions:

  • Spaceflight significantly impacts bone health, necessitating targeted research for effective countermeasures.
  • Understanding the mechanisms of spaceflight-induced bone loss is critical for astronaut health during long-duration missions.
  • Future research should focus on subregional bone changes and developing efficient countermeasures.
Keywords:
NASA Center HQSNASA Center JSCNASA Discipline MusculoskeletalNon-NASA Center

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