This study has been tried to investigate the relationship between heat or cold tolerances of human body and the influence of climatic conditions. Fifty-one healthy male adults immigrating to the Okinawan district from the mainland of Japan were used for this study with 55 controls residing natively in Okinawa. Three loadings of heat or cold exposures to the whole body and the vascular hunting reaction was applied on the individuals in each group. The series of these experiments were performed at summer and winter periods. The measured values and subjects were investigated comprehensively by the various multivariate analyses. The results of cluster analysis of subjects by three pieces of different variables are as follows; 1) R.I. of Nakamura's method is representing a typical index of local cold tolerances. 2) The differences in physical constitution of immigrants and native Okinawans has not effected upon dendrograms of subjects. From the classification of subjects by cluster analysis, principal component analysis and factor analysis, it was obvious that the division of summer and winter experiments took precedence of the division of immigrants and native Okinawans. In comparison of immigrants with native Okinawans for these three tolerances, there was some difference in heat tolerances between the two groups.
The effect of the vitamicn C intake on serum SGPT activity was examined. The results are as follows. 1) In an epidemiological study, significant correlaiton was found between SGPT activity and serum vitamin C in 76 healthy young volunteers (y=-18.7x + 19.2, r=-0.383). 2) In a laboratory study, we administered vitamin C at dose of 1 g/day for 10 days and then at a dose of 10 g/day for 10 days to five subjects, but found not significant different between SGPT activity before and after treatment. 3) We administered vitamin C at dose of 1 g/day for 1 year, but found not significant different between SGPT activity before and after treatment.
To make clear the relationship between taste threshold and skinfold thickness as an index of obesity, the taste threshold of the female subjects who lived in Shiramine-village, Ishikawa Prefecture were measured with an electrogustmeter in the chorda tympani. The results obtained were as follows. 1. The taste threshold values measured with an electrogustmeter did not change significantly with age. 2. There was significant positive correlation between abdominal skinfold thickness and taste threshold value measured with an electrogustmeter. This relationship was pronounced in subjects of 49 years old or less. These results suggest that there might be some relationships between female obesity and the elevation of taste threshold, namely, numbness of taste, especially, at 49 years old or less.
The present study was carried out to clarify the actual conditions of blood pressure level among the 263 couples of those who have lived in Tanegashima Island of Kagoshima Prefecture and to discuss the daily self-control for blood pressure between the couple. The following results were obtained. 1) There were the statistically significant relations in both diastolic and systolic pressures between husband and wife, suggesting that the fact might be caused by a similar dietary pattern being taken among the couples. 2) The results of discriminant analysis revealed that the levels of blood pressure for both husband and wife were closely related to the factors of their past history, age and family history. 3) Of 189 couples whose blood pressures were normal, 65 couples or 34.4% coincidently selected the treatment of taking care of salt intake for self-control of their blood pressures, 21.7% having a good sleep and 17.9% taking care of over-eating. Of 74 couples whose blood pressures were abnormal, 26 couples (35.1%) coincidently also selected the treatment of taking care of salt intake for self-control of their blood pressures, 27.4% taking care of over-eating and 13.5% having a good sleep.