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Hemodynamic and hormonal changes induced by noise.

L Andrén, L Hansson, M Björkman

    Acta Medica Scandinavica. Supplementum
    |January 1, 1979
    PubMed
    Summary
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    Exposure to industrial noise significantly impacts cardiovascular health. Prolonged exposure to loud noise, even at moderate levels, causes temporary but measurable changes in blood pressure and cardiac function.

    Area of Science:

    • Occupational Health
    • Cardiovascular Physiology
    • Environmental Health

    Background:

    • Industrial noise is a common workplace stressor.
    • Previous research indicates noise can affect physiological responses.
    • Understanding the specific hemodynamic effects of industrial noise is crucial for worker safety.

    Purpose of the Study:

    • To investigate the acute hemodynamic effects of varying industrial noise levels on healthy male volunteers.
    • To assess changes in blood pressure, heart rate, stroke volume, and cardiac output during and after noise exposure.
    • To determine if noise exposure influences plasma catecholamine levels.

    Main Methods:

    • Eighteen healthy male volunteers were exposed to industrial noise at 75, 85, and 95 dB A in a controlled laboratory setting.

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  • Noninvasive techniques were used to record blood pressure, heart rate, stroke volume, and cardiac output.
  • Venous plasma concentrations of adrenaline and noradrenaline were analyzed before and during noise exposure.

    • Main Results:

    • Diastolic blood pressure, mean arterial pressure, and total peripheral resistance significantly increased with noise exposure.
    • At 95 dB A, stroke volume and cardiac output were reduced, while heart rate and systolic blood pressure showed no significant changes.
    • Similar, but less pronounced, hemodynamic changes were observed at 75 and 85 dB A. No changes in plasma adrenaline or noradrenaline were detected.
    • Hemodynamic alterations persisted for 5 minutes post-exposure, resolving within 10 minutes of rest.

    Conclusions:

    • Industrial noise exposure induces significant acute hemodynamic changes, including increased blood pressure and peripheral resistance, and reduced cardiac output at higher levels.
    • These physiological responses are dose-dependent, with greater effects observed at higher sound levels.
    • The cardiovascular effects of noise are temporary, with a rapid return to baseline after cessation of exposure, suggesting the body's adaptive capacity to acute noise stress.