This experiment was carried out in spring (April, 1954) as a series of previous experiments (Jap. J. Nutrition, 13, 135; 14, 43, 49, 1956) to know the seasonal differences in the effect of the environmental temperatures on the basal heat production.
The results were as follows:
1) The rising of the heat production at high environmental temperature 40°C appeared earlier after entering into the experimental room and also the rate of the rising metabolism was higher than in other seasons. This tendensy suggests that body may be susceptible to the higher environmental temperature in spring.
2) At lower temperature 10°C there was no significant variation of the heat production above basal metabolism in considering the influence of the restlessness. It seemes that one keeps still in spring as much tolerance or adaptability to the relative lower environmental temperature sa in winter.
The rates of rising heat production at 0°C and -10°C temperatures were the same in other seasons.