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Related Experiment Videos

Physiological response to exercise after space flight--Apollo 14 through Apollo 17.

J A Rummell, C F Sawin, M C Buderer

    Aviation, Space, and Environmental Medicine
    |May 1, 1975
    PubMed
    Summary

    Apollo astronauts experienced temporary resting and exercise tachycardia post-flight, which compensated for reduced stroke volume. Most crewmen recovered preflight physiological responses within a day, showing no changes in exercise efficiency.

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    Area of Science:

    • Space Medicine
    • Cardiovascular Physiology
    • Exercise Physiology

    Background:

    • Spaceflight alters cardiovascular function.
    • Understanding physiological adaptations to microgravity is crucial for astronaut health.
    • Previous studies indicated potential cardiovascular deconditioning after space missions.

    Purpose of the Study:

    • To assess cardiovascular responses to submaximal exercise preflight and postflight in Apollo astronauts.
    • To identify immediate physiological changes and recovery patterns after space missions.
    • To evaluate the impact of spaceflight on heart rate, blood pressure, and cardiac output during exercise.

    Main Methods:

    • Submaximal exercise stress tests using a bicycle ergometer.
    • Measurements included heart rate, respiratory gas exchange, blood pressure, and cardiac output.

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  • Preflight baseline data established from multiple tests prior to the mission.

    • Main Results:

    • Immediate postflight observations showed tachycardia at rest and during exercise.
    • This tachycardia appeared to compensate for a reduced stroke volume.
    • Systolic blood pressure decreased during exercise; diastolic blood pressure showed no consistent changes.
    • Most astronauts returned to preflight cardiovascular levels by the day after recovery, except for Apollo 15 crewmen.
    • No significant changes in mechanical or respiratory efficiency were noted immediately postflight.

    Conclusions:

    • Spaceflight induces transient cardiovascular adjustments, primarily tachycardia, to maintain cardiac function.
    • The cardiovascular system demonstrates a rapid recovery of normal function for most astronauts post-spaceflight.
    • Exercise efficiency remains largely unaffected by short-term space exposure.