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Abdomen-high elastic gradient compression garments during post-spaceflight stand tests.

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Area of Science:

  • Space physiology and exploration medicine.
  • Development of countermeasures for spaceflight-induced physiological deconditioning.

Background:

  • Astronauts experience orthostatic intolerance after spaceflight, a condition not fully addressed by current garments.
  • Existing countermeasures like antigravity suits and elastic-compression garments have limitations.

Purpose of the Study:

  • To investigate the efficacy of an elastic graded compression garment (GCG) as a countermeasure for post-spaceflight orthostatic intolerance.
  • To evaluate the GCG's ability to mitigate physiological changes associated with standing after space missions.

Main Methods:

  • A 3.5-minute stand test was conducted preflight and postflight with 14 astronauts.
  • Seven astronauts wore the GCG on landing day, while seven served as controls.
  • Physiological parameters including heart rate, blood pressure, stroke volume, and cardiac output were measured.

Main Results:

  • No astronauts experienced presyncope during the stand tests.
  • The GCG group showed a lower heart rate increase from prone to standing compared to controls on landing day.
  • Total peripheral resistance increase from prone to standing was higher in GCG subjects post-spaceflight.

Conclusions:

  • The elastic graded compression garment (GCG) effectively prevented tachycardia and maintained total peripheral resistance during standing after spaceflight.
  • The GCG demonstrates potential as a practical and comfortable countermeasure for orthostatic intolerance.
  • Further validation is needed for long-duration spaceflight scenarios.