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The purpose of this study was to compare the rewarming effectiveness of a radio frequency coil (13.56 MHz) at a specific absorption rate (SAR) of 2.5 W/kg (RF) with warm water immersion (40°C) (WW) and an insulated mummy-type insulating sack (IS) under simulated field conditions. Four male subjects, ages 24-35, were immersed in 10°C water for up to 90 min or until their rectal temperatures (T ...