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Exploring the Effects of Spaceflight on Mouse Physiology using the Open Access NASA GeneLab Platform
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Magnesium and Space Flight.

Scott M Smith1, Sara R Zwart2

  • 1Biomedical Research and Environmental Sciences Division, NASA Johnson Space Center, Houston, TX 77058, USA. scott.m.smith@nasa.gov.

Nutrients
|December 17, 2015
PubMed
Summary
This summary is machine-generated.

Astronaut magnesium status is maintained during space missions, with increased urinary excretion likely from bone and diet, not muscle. Tissue magnesium remains stable, suggesting good overall homeostasis for space exploration.

Keywords:
bed restbonemicrogravitytissue magnesium

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Area of Science:

  • Space physiology
  • Human physiology
  • Nutritional science

Background:

  • Magnesium is vital for muscle, cardiovascular, and bone health.
  • Understanding magnesium status is crucial for astronauts during space missions.

Purpose of the Study:

  • To evaluate magnesium status in astronauts before, during, and after space missions.
  • To assess magnesium changes in a head-down-tilt bed rest analog.
  • To correlate magnesium levels with bone mineral content changes.

Main Methods:

  • Measured serum and 24-hour urinary magnesium excretion.
  • Assessed tissue magnesium status using sublingual cells.
  • Monitored astronauts (n=43) and bed rest participants (n=27).

Main Results:

  • Serum magnesium increased late in flight; urinary magnesium excretion was elevated during missions.
  • Urinary magnesium decreased significantly upon landing.
  • No significant changes in serum or urinary magnesium were observed during bed rest.
  • Correlations found between magnesium levels and bone mineral content changes.

Conclusions:

  • Increased magnesium excretion during spaceflight may originate from bone and diet.
  • Muscle tissue magnesium stores appear unaffected.
  • Magnesium homeostasis and tissue status are generally well-maintained during 4-6 month space missions.