Sitting or lying in hot water without exercising, used for heat or recovery studies.
Passive hot-water immersion involves submerging part or all of the body (commonly to the waist, chest, or neck) in heated water, typically 38–44°C, without concurrent physical activity. It is used experimentally as a heat-stress or heat-acclimation stimulus, and in applied settings as a post-exercise recovery modality thought to aid vascular and thermoregulatory adaptation. Protocols vary widely in water temperature, immersion depth, and duration across studies, so findings and dose-response relationships are not always directly comparable between trials.
This guide was auto-drafted and is pending editorial review.