Abstract
A human calorimeter may have advantages in the estimation of body heat exchange and the rate of body heat storage in favor of the direct measurement of heat loss or gain from the human body. In this study, the human calorimeter is described that allows for precise measurement of local heat loss from forearm, trunk, thigh, calf and head. Thirty eight experiments were performed on nine male and ten female subjects. During each experiment, heat production was calculated from continuously measured oxygen consumption. Tympanic and skin temperatures were also continuously measured. Subject's body composition was assessed to provide percent body fat and adiposity. The rates of body heat storage measured showed a better correlation with those calculated from authors' equation incorporating body composition as compared with the conventional equation. In addition, heat loss was found to be dependent on insulation of adipose tissues when no sweat and shivering were induced.
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