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Related Experiment Videos

Inflight exercise affects stand test responses after space flight.

S M Lee1, A D Moore, J M Fritsch-Yelle

  • 1Wyle Laboratories, Life Sciences Systems and Services Division, and NASA-Johnson Space Center, Houston, TX 77058, USA.

Medicine and Science in Sports and Exercise
|December 29, 1999
PubMed
Summary

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Moderate to high levels of inflight exercise helped space shuttle crew members maintain heart rate (HR) and pulse pressure (PP) responses to standing post-flight. Low exercise levels led to greater orthostatic stress after space travel.

Area of Science:

  • Space physiology
  • Cardiovascular responses
  • Exercise science

Background:

  • Spaceflight alters cardiovascular regulation, impacting heart rate (HR) and blood pressure (BP) responses to postural changes.
  • Understanding the effects of inflight exercise on post-flight orthostatic tolerance is crucial for astronaut health.

Purpose of the Study:

  • To investigate if exercise performed by Space Shuttle crew members during short-duration flights affects post-flight heart rate (HR) and blood pressure (BP) responses to standing.
  • To determine the relationship between exercise intensity and duration and cardiovascular adaptation to gravity after spaceflight.

Main Methods:

  • Thirty crew members were grouped into high (HIex), medium (MEDex), and low (LOex) exercise categories based on inflight exercise logs.
  • Heart rate (HR) and blood pressure (BP) responses to a 10-min stand test were measured before (PRE) and within 4 hours of landing (POST).
Keywords:
NASA Center JSCNASA Discipline CardiopulmonaryNASA Program Biomedical Research and Countermeasures

Related Experiment Videos

  • Analysis of variance (ANOVA) was used to compare HR and BP responses between exercise groups (P < 0.05).

    • Main Results:

    • All groups showed an increased standing HR post-flight compared to pre-flight.
    • The increase in standing HR was significantly greater in the low exercise (LOex) group (36 bpm) versus high (HIex) and medium (MEDex) exercise groups (25-22 bpm).
    • Post-flight, the decrease in pulse pressure (PP) from supine to standing was significantly greater in the LOex group (-19 mm Hg) compared to PRE (-9 mm Hg), while unchanged in HIex and MEDex groups.

    Conclusions:

    • Moderate to high levels of inflight exercise attenuated the adverse heart rate (HR) and pulse pressure (PP) responses to standing after space flight.
    • Inflight exercise is effective in mitigating orthostatic intolerance following short-duration space missions.