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Related Experiment Videos

Hormonal and cardiovascular variations during a public lecture.

U Bolm-Audorff, J Schwämmle, K Ehlenz

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1986
    PubMed
    Summary

    Public speaking significantly elevates stress hormones like epinephrine and cortisol, alongside blood pressure and pulse. The epinephrine/norepinephrine ratio may indicate psychomental strain.

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    Area of Science:

    • Endocrinology
    • Cardiovascular Physiology
    • Psychoneuroendocrinology

    Background:

    • Public speaking is a common stressor.
    • Stress responses involve hormonal and physiological changes.
    • Quantifying these changes aids in understanding human stress.

    Purpose of the Study:

    • To investigate the physiological and hormonal responses to the stress of public speaking.
    • To assess changes in plasma and urine concentrations of key stress biomarkers.
    • To explore the utility of the epinephrine/norepinephrine ratio as an indicator of psychomental strain.

    Main Methods:

    • 12-hour electrocardiogram (ECG) monitoring and regular blood pressure measurements in ten healthy individuals.
    • Blood sampling for plasma hormone analysis (epinephrine, norepinephrine, cortisol, hGH, prolactin, gastrin) via venous catheter.

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  • Analysis of epinephrine, norepinephrine, and cortisol levels in collected urine samples.

    • Main Results:

    • A distinct increase in blood pressure and pulse rate was observed during the public speech.
    • Epinephrine and cortisol levels showed the most significant increase in both serum and urine.
    • Norepinephrine, human growth hormone (hGH), prolactin, and gastrin exhibited less pronounced responses.

    Conclusions:

    • Public speaking induces measurable physiological and hormonal stress responses in healthy individuals.
    • Epinephrine and cortisol are key biomarkers for acute stress related to public speaking.
    • The epinephrine/norepinephrine ratio warrants further investigation as a potential marker for psychomental and emotional strain.