This experiment with the intention of investigating differences in cold resistance between those who grew in the subtropical zone and are now living in the temperate zone and those who grew in the temperate zone has been performed in Nagasaki for 4 years; twice (summer and winter) a year. All the subjects were young males: 13 subjects who grew in the temperate zone of Japan (Group M), 11 who grew in Okinawa (Group 0) and 17 who grew in Taiwan (Group T); some subjects of Group 0 and T are those who have lived in the temperate zone of Japan for 6 years. Physical measurement was made on these subjects and then these subjects, in clothes of 1, 8 do, were exposed to cold air for 60 min under the following conditions: room temperature of 10°C, relative humidity of 70 - 80% and wind velocity of 0.5/sec. Skin temperature was continuously measured for 60 min along the exposure to cold air through thermistors attached on 9 spots on the skin, The Douglassbag method was employed for the metabolic measurement; the measurement was made 2 times along the exposure to cold air: 0 min and 60 min from the beginning. Blood samples were also taken both at the beginning and the end of the exposure; measurement was made on haematocrit and free fatty acid (FFA). The following are differences in physique and in response to the exposure to cold air among these three groups. Physique: subjects of Gfoup T were taller and weighed lighter than those of the other groups but had the thickest subcutaneous fat; these results are opposite to the current leading theory that those who have grown in the tropical zone have less subcutaneous fat.Cold resistance: Group M> Group O> Group T; this is the result calculated from the comparative data of distribution on the correlation diagram, that is ?φT: ?φM (decrease in mean skin temperature: metabolic increase), which was designed by the author. With this method, a comparison of cold resistance was made, for each Groups O and T, between those who have long lived in the temperate zone and those who have just come from the subtropical zone: no significant differences were observed for each group. These three groups had differences in correlation between increases in FFA and decreases in RQ, which indicate increases in the fat-combustion quotient: positive corelation was observed for Group O and no correlation for Group M; as for Group T, positive correlation was observed for Group O and no correlation for Group M; as for Group T, positive correlation was observed only for data in winter. The hemoconcentration was calculated through changes in haematocrit as follows:Group T> Group O > Group M.
In order to investigate the health effects of exposure to methylmercury, a mortality study was carried out by means of standardized mortality ratio (SMR) in the most prevalent area with Minamata disease for the period 1970-81. Information on death (216 males and 196 females) was available from the population registry which had been kept in Minamata City municipal office since 1970. All but one certificates of death (follow-up rate 99.8%) on these subjects were collected through the district legal affairs bureau. The SMRs for cancer of the liver and chronic liver diseases were significantly higher, at least 5% level, in the most prevalent area than in Minamata City, but all causes of death were not significantly different. High SMRs for cancer of the liver and chronic liver diseases are consistent with the results from the mortality analysis of Minamata disease patients. It was emphasized that this issue should be further investigated by taking into account the related multiple risk factors to liver cancer and chronic liver diseases including liver cirrhosis.
Using the records of health screening test carried out for children at the age of oneand- a-half years in Toda city in the last three years, the prevalency of children with delayed speech in low birth weight children and the relation between the language development and the birth weight were investigated. The results were as follows: 1) Four hundred and fourteen or 17.3% out of 2, 399 children were pointed out to be delayed in speech. 2) A trend of slight increase in prevalency of children with delayed speech was found at the age of one-and-a-half-years. 3) Fourty or 28.2% out of 142 low birth weight children were pointed out to be delayed in speech. The lower the birth weight, the more delayed in speech . 4) The children with delayed speech were found both in S.F.D. (Small For Date) and in A.F.D. (Appropriated For Date) children . The prevalency of children with delayed speech in the latter was higher than in the former . And there was significant difference in the former between the backward children in the development of vocabulary and the children having no meaningful words. 5) Meny low birth weight children delayed in speech were delayed also in starting to walk.
Two-hundred and eighty four inhabitants living along the roads, its width is S to 6 meters and dump truck traffic is about four thousands per day, were interviewed in 1981 to get any information on their subjective complaints and social responses to the traffic disturbances. The results were as follows; Multiple and violent sufferings such as noise, vibration, dust, exhaust, sprash, and traffic accident were complained. The inhabitants who were extremely suffered from all these items were one third of them. On the other hand, the man who were remonstrated these sufferings against governments and enterprisers were thirty-seven percents . The results of factor analysis with thirty-nine variables to realize their types of social reactions was as follows; first factor (contribution ratio was forty point eight percents) was the type who were suffered heavily but actively responsed . Second factor was that they were lived in very dusty environments but not responsed because the member of a family was concerned with enterprisers. Third was heavily suffered from noise and vibration but not responsed because they were also trading. Thus there were many types of responses, but they were cancelled each other in the small community. Therefore the state of affairs was not changed for these twenty years . So it was suggested that social reaction of each inhabitant were closely connected with the dynamics of his small community.