The heat balance equation of the human body describes the heat balance between the human body and its surrounding thermal environment, and specific data are required to calculate this body heat balance. Such data have been derived from human experiments and measurements under the standing or seated postures in consideration of environment in office space. However, because the range of actions is higher in living spaces than in work spaces, active natural regulation of body temperature based on environmental variables occurs and adjustments are made in the thermal environment. In Japanese living spaces, various postures are assumed depending on behavior and the differences in these postures strongly affects the specific data related to body heat balance. Furthermore, because physical characteristics can vary with factors such as ethnicity and diet, it is necessary to consider ongoing studies of the human body. In addition, the Japanese physique has changed substantially with eating habits and lifestyles following World War II. Therefore, studies on the Japanese thermal environment in modern Japan have progressed along with studies on the Japanese people following these changes. Specific data studies on the human body, which involved the heat balance equation between the human body and the environment, progressed and factors related to the human body were thus clarified. The accumulation of specific data studies on the human body clarified a several points, and the necessity of calculating the heat balance for Japanese individuals was shown.
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