Figure 2. To separate the contributions of decreased overall heat balance and internal redistribution of body heat to the decrease in core temperature, we multiplied and change in overall heat balance by body weight and the specific heat of humans. The resulting change in mean body temperature (“heat balance”) was subtracted from the change in core temperature (“measured”), leaving the core hypothermia specifically resulting from redistribution (“redistribution”). After 1 h of anesthesia, core temperature had decreased 1.6 plus/minus 0.3 degrees Celsius, 3 with redistribution contributing 81% to the decrease. During the subsequent 2 h of anesthesia, core temperature decreased an additional 1.1 plus/minus 0.3 degrees Celsius, with redistribution contributing only 43%. Redistribution thus contributed 65% to the entire 2.8 plus/minus 0.5 degrees Celsius decrease in core temperature during the 3 h of anesthesia. Induction of general anesthesia is identified as elapsed time 0; all values after elapsed time 0 differ significantly from those preceding induction of anesthesia.