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A vascular mechanism to explain thermally mediated variations in deep‐body cooling rates during the immersion of profoundly hyperthermic individuals

What is the central question of this study? Does the cold‐water immersion (14°C) of profoundly hyperthermic individuals induce reductions in cutaneous and limb blood flow of sufficient magnitude to impair heat loss relative to the size of the thermal gradient? What is the main finding and its importance? The temperate‐water cooling (26°C) of profoundly hyperthermic individuals was found to be rapid and reproducible. A vascular mechanism accounted for that outcome, with temperature‐dependent differences in cutaneous and limb blood flows observed during cooling. Decisions relating to cooling strategies must be based upon deep‐body temperature measurements that have response dynamics consistent with the urgency for cooling.