DESCRIPTION OF INDIVIDUAL DIFFERENCE IN HUMAN BODY TEMPERATURE REGULATION BY USING TWO-NODE MODEL

The methodology to describe the individual difference in temperature regulation of human body in transient state is proposed in this paper. In order to clarify the individual difference experimentally, the change in skin and core temperatures was measured for four subjects exposed to a thermal transient condition including stepwise air temperature change of coming and going to lower and higher temperature condition from thermally neutral condition. The differences in core temperature and regulatory responses were found to be significant. At the same time, for each subject who participated in the experiments, the physiological parameters in two-node model were determined by using the experimental data and a numerical optimization program. With the use of the determined combination of parameters, the calculated results agreed well with the experimental results both for skin and core temperatures for all four subjects. The experimental results in another case of transient state were analyzed and they coincided well with the calculated results obtained with using the above determined parameters. Therefore it was shown that the combination of the parameters determined in this paper describe the characteristics in dynamic thermoregulatory responses of each subject