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Related Experiment Videos

Urinary albumin in head-down bed rest.

Massimo Cirillo1, Davide Stellato, Martina Heer

  • 1Nephrology-Second University of Naples, Naples, Italy. massimo.cirillo@unina2.it

Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|March 9, 2004
PubMed
Summary

Microgravity, simulated by head-down bed rest, significantly reduces urinary albumin excretion. This finding supports the hypothesis that reduced gravity impacts kidney function and protein handling.

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Area of Science:

  • Space medicine
  • Renal physiology
  • Human physiology

Background:

  • Previous space missions indicated lower urinary albumin excretion in astronauts.
  • This suggests microgravity may affect renal albumin handling.

Purpose of the Study:

  • To investigate the effect of simulated microgravity on urinary albumin excretion.
  • To test the hypothesis that low gravity reduces renal albumin excretion.

Main Methods:

  • Utilized head-down bed rest (-6 degrees) as a microgravity model.
  • Eight healthy males underwent baseline and intervention (HDBR) phases.
  • Collected urine samples and measured albumin/creatinine ratio.

Main Results:

  • Urinary albumin/creatinine ratio decreased by 9.3% during head-down bed rest.

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  • In contrast, the ratio increased by 14.9% during the control period.
  • The difference in changes between HDBR and control was statistically significant (p < 0.01).

    • Conclusions:

    • Simulated microgravity significantly reduces renal albumin excretion.
    • Findings support the hypothesis that reduced gravity impacts kidney function.
    • This has implications for understanding physiological adaptations to spaceflight.