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Related Experiment Videos

Plasma catecholamines in Finnish sauna.

E Hussi, T Sonck, H Pösö

    Annals of Clinical Research
    |October 1, 1977
    PubMed
    Summary
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    Finnish sauna use significantly increases plasma noradrenaline levels. Beta-blockade did not alter this response but did lower heart rate during heat exposure.

    Area of Science:

    • Physiology
    • Endocrinology
    • Cardiovascular Research

    Background:

    • Finnish sauna use is a common practice involving significant heat exposure.
    • Heat stress is known to activate the sympathetic nervous system, leading to catecholamine release.
    • The specific effects of sauna on plasma catecholamines, particularly noradrenaline and adrenaline, require further elucidation.

    Purpose of the Study:

    • To investigate the impact of Finnish sauna bathing on plasma catecholamine levels (noradrenaline and adrenaline) in healthy individuals.
    • To assess whether beta-blockade with oxprenolol modifies the plasma catecholamine response to sauna exposure.
    • To examine the effect of subsequent cold water immersion on these hormonal changes.

    Main Methods:

    • Five healthy medical students participated in the study.

    Related Experiment Videos

  • Plasma catecholamines were quantified using a modified single-isotope radioenzymic assay.
  • Measurements were taken during and after a Finnish sauna session (100°C) with and without prior administration of oxprenolol (40 mg), followed by a cool swimming pool (22°C) and a rest period.

    • Main Results:

    • Plasma noradrenaline levels more than doubled after 10 minutes in the hot room, while adrenaline showed smaller increases.
    • Noradrenaline remained elevated or increased further after cold water immersion, whereas adrenaline returned to baseline.
    • Marked elevation of plasma noradrenaline persisted after a 15-minute rest period post-immersion.
    • Oxprenolol effectively reduced heart rate but did not alter the plasma catecholamine response to heat stress.

    Conclusions:

    • Finnish sauna bathing induces a significant and sustained increase in plasma noradrenaline, indicative of sympathetic nervous system activation.
    • Cold water immersion following sauna partially attenuates the adrenaline response but does not fully normalize noradrenaline levels.
    • Beta-blockade with oxprenolol does not blunt the catecholamine response to sauna heat stress, despite its effects on heart rate.