抄録
Physiological thermogenesis in intemal organs as well as main muscle groups is one of the most important subjects in the study of human adaptability to cold environment. The experiments of the prediction of obligatory non-shivering thermogenesis were performed under optimal thermal condition in summer and in winter by using a prediction method of local muscle energy metabolic rate and quasi-basal metabolic rate B1 (Yokayama, 1980). B1 means the sum of metabolic rates other than those of main muscle groups. The subjects were eleven Japanese males in sumrner and ten Japanese males in winter. Subject YS was longitudinally examined to confirm seasonal change of obligatory non-shivering thermogenesis. Subject YS was performed to examine regulatory non-shivering thermogenesis and shivering thermogene-sis by using nine resting and static exercising items of back cold and front cold under three cold environments (T=-l0°C, -5°C and 0°C. In the summer experiments Bls were 32.43 (mean) ±12.59 (S.D.) kcal/h and B1/A= 19.81 ±9.26 kcal/m2 h. On the other hand, the results of the winter experiments were 67.32±7.83 kcal/h and B1/A=38.90±5.27 kcal/m3h. This tendency of the seasonal variation that the quasi-basal metabolic rate B1 in winter was greater than in summer was coincident with the results in winter and in summer obtained from the same subject YS. In subject YS the predicted B1S were 29.87 in summer, 57.84 in December and 55.55 and 57.92 kcal/h in March. In order to evaluate regulatory non-shivering thermogenesis, the predictions of B1 were performed from item-e of back cold and front cold under cold environments. B1 under T=-5°C and T=0°C were 78.19 and 83.13 kcal/h respectively. Therefore the value of regulatory non-shivering thermogenesis was about 22 kcal/h under the present experimental conditions. The shivering thermogenesis was predicted for six to nine muscle groups in nine resting and exercising items of back cold and front cold under three cold environments
