Hot Tubs Outperform Saunas for Heat-Based Health Benefits
Researchers compared passive heating methods and found that hot water immersion raises core body temperature more effectively than traditional or infrared saunas, producing stronger boosts in blood flow and immune activity. Hot tubs were the only method that produced measurable changes in inflammatory markers, with benefits persisting beyond the session. For individuals unable to exercise, heat therapy may offer an effective alternative for health benefits.
The study, published in the American Journal of Physiology, recruited twenty healthy adults aged 20 to 28 who exercised regularly. This specific demographic allowed researchers to isolate heat effects without interference from varying fitness levels or age-related factors.
Lead author Jessica Atencio noted that water immersion prevents efficient heat loss through sweating, driving a more robust core temperature increase. Study director Christopher Minson has spent over twenty years investigating how heat exposure relates to aging, fitness, and illness, highlighting the field's long-standing focus on this therapy.
This research could reshape recommendations for individuals unable to engage in physical exercise, such as those with mobility limitations or chronic conditions. If hot tubs reliably produce stronger physiological responses than saunas, they may become a preferred, accessible alternative for cardiovascular and immune support. However, the study's young, healthy participant pool suggests broader effects on older or clinical populations remain to be validated, so practical guidelines should await further confirmation.