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Hot Tubs Boost Heart and Immune Health More Than Saunas

A University of Oregon study shows soaking in hot water raises core temperature more effectively than saunas to elicit stronger cardiovascular followed by immune reactions

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Peaceful moment for senior woman bathing in hot tub.
Soaking in hot water proves to be the most effective heat therapy method for boosting your health. (fast-stock/Shutterstock)

Overview

  • The high thermal conductivity and immersion environment of hot tubs limit evaporative cooling to sustain a stronger hyperthermic stimulus than in dry or infrared saunas.
  • Participants exhibited increased cardiac output and vascular shear stress during hot tub sessions, key factors linked to reduced arterial stiffness and lower resting blood pressure.
  • Blood analyses revealed that only hot water immersion elevated inflammatory cytokines and altered immune cell populations, suggesting enhanced immune system activation.
  • The trial enrolled twenty physically active adults aged 20 to 28 under controlled conditions to directly compare three passive heat therapies.
  • Investigators propose heat therapy as a viable supplement or alternative to exercise for those unable or unwilling to work out, while advising medical clearance to ensure safety.