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Related Experiment Videos

Saliva cortisol: a good indicator for acceleration stress.

H Tarui, A Nakamura

    Aviation, Space, and Environmental Medicine
    |June 1, 1987
    PubMed
    Summary

    Exposure to high G-force (+Gz) acceleration significantly elevates salivary cortisol levels in healthy individuals. Saliva cortisol monitoring offers a practical method to assess +Gz stress in non-aircrew subjects.

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    Area of Science:

    • Physiology
    • Aerospace Medicine
    • Endocrinology

    Background:

    • Human tolerance to acceleration stress is a critical factor in aviation and spaceflight.
    • Understanding physiological responses to +Gz acceleration is essential for safety and performance.
    • Cortisol, a stress hormone, is a potential biomarker for physiological strain.

    Purpose of the Study:

    • To investigate the impact of acute +Gz acceleration on salivary cortisol levels.
    • To determine if salivary cortisol can serve as a reliable indicator of +Gz stress.
    • To explore the dose-response relationship between +Gz levels and cortisol secretion.

    Main Methods:

    • Four healthy male non-aircrew volunteers participated in the study.
    • Participants were exposed to controlled +Gz acceleration up to +5Gz for 1 minute without a G-suit.
    • Salivary cortisol levels were measured at baseline and at specific intervals post-acceleration.

    Main Results:

    • A significant increase in salivary cortisol was observed at +4Gz and +5Gz stress levels (p < 0.001).
    • Cortisol levels showed a trend of increasing with higher magnitudes of +Gz exposure.
    • The data suggest a clear physiological response to acute acceleration stress.

    Conclusions:

    • Salivary cortisol levels significantly increase in response to acute +Gz acceleration.
    • Monitoring salivary cortisol is a viable and advantageous method for assessing +Gz stress.
    • These findings have implications for physiological monitoring in high-G environments.

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