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Orthostasis: exercise and exercise training

G Geelen, J E Greenleaf

    Exercise and Sport Sciences Reviews
    |January 1, 1993
    PubMed
    Summary
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    This study addresses exercise training effects on gravitational tolerance and the underlying mechanisms of syncope (fainting). Understanding these factors is crucial for improving human performance and safety in high-G environments.

    Area of Science:

    • Physiology
    • Exercise Science
    • Aerospace Medicine

    Background:

    • Gravitational tolerance is critical for activities involving high G-forces.
    • Syncope, or fainting, is a key indicator of reduced gravitational tolerance.
    • The interplay between exercise training and syncope mechanisms is not fully understood.

    Purpose of the Study:

    • To investigate how different exercise training modes impact gravitational tolerance.
    • To explore the physiological mechanisms behind blood pressure failure leading to syncope.
    • To differentiate between practical and theoretical aspects of syncope research.

    Main Methods:

    • Analysis of experimental data correlating exercise training with syncope onset.
    • Examination of physiological responses during simulated high-G exposure.
    Keywords:
    NASA Center ARCNASA Discipline Number 18-10NASA Discipline Regulatory PhysiologyNASA Program Space Physiology and Countermeasures

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  • Review of existing literature on exercise physiology and cardiovascular regulation.

    • Main Results:

    • Exercise training may influence the onset of presyncopal symptoms and syncope.
    • Distinct physiological mechanisms contribute to blood pressure regulation during G-exposure.
    • Experimental designs often confound the effects of training with the mechanisms of syncope.

    Conclusions:

    • Further research is needed to clarify the independent effects of exercise on gravitational tolerance.
    • Understanding syncope mechanisms is essential for optimizing training protocols.
    • Clearer experimental designs are required to isolate training effects from physiological responses.