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Related Experiment Video

Updated: May 5, 2026

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Repeatability of artificial gravity tolerance times.

T Stead1, A P Blaber1,2, D N Divsalar1

  • 1Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada.

Frontiers in Physiology
|May 19, 2025
PubMed
Summary
This summary is machine-generated.

Artificial gravity (AG) testing for orthostatic intolerance may be valid for males up to seven months. Further research is needed to confirm validity for females and with larger participant groups.

Keywords:
blood pressurecardiovascularheart ratepresyncopeshort-arm human centrifuge

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Area of Science:

  • Space Medicine
  • Human Physiology
  • Cardiovascular Research

Background:

  • Microgravity exposure causes physiological deconditioning, including orthostatic intolerance.
  • Artificial gravity (AG) via short-arm centrifuges is a potential countermeasure tested in ground-based studies.
  • Determining the validity period of AG orthostatic tolerance data is crucial for spaceflight analog studies.

Purpose of the Study:

  • To investigate the temporal validity of artificial gravity (AG) orthostatic tolerance testing.
  • To assess how long AG orthostatic tolerance data remains valid for use in spaceflight analog studies.

Main Methods:

  • Secondary analysis of two AG orthostatic tolerance tests conducted 7 months apart.
  • Involved 4 males and 3 females who participated in both testing sessions.
  • Utilized Lin's concordance correlation coefficient (LCCC) to compare time to presyncope and heart rate responses.

Main Results:

  • A significant relationship in time to presyncope was found between the two test dates for males (LCCC = 0.98), but not for females (LCCC = -0.64).
  • Mean heart rate responses showed a strong linear correlation between tests for all participants (excluding one female).
  • High LCCC for time to presyncope in males was achieved despite varied heart rate baselines.

Conclusions:

  • Time-to-presyncope tests for orthostatic tolerance using AG may remain valid for males up to 7 months.
  • Further investigation with larger male and female cohorts is recommended to confirm these findings.