In 1898, blood pressure of psychosis was reported by M. Craig. Since then several studies concerning blood pressure and psychic factors were reported by several researchers. In 1930's, studies of hypertension through psychosomatic aspects were reported, however, number of cases handled in these reports were very few. It was only curing the last 10 years that studies on many hypertensive cases had been reported. (cf. E. Weiss, F. Dunbar. G. C. Gressel, F. M. Reiser). However, there has been no report concerning psychic differences between hypertension group and normal healthy group. The authors intended to find psychic factors relating to hypertension. Subjects were 1, 800 workers (above 30 years of age) employed at the Nikko Copper Works, Nikko, Tochigi Prefecture. Reasons of choosing that factory were: 1. It is situated on high altitude (71bm above sea lever) in cold climate and its workers are mostly laborers. These conditions expect higher blood pressure. 2. Its workers are mainly male. Life histories of each workers are very simliar, i. e., they are generally from poor farmers and of mostly primary school education. Their living conditions lasted for more than 10 years, in most cases.
In this report, preliminary general items shall be discussed.
1) Blood pressure of 1, 707 subjects were measured.
2) Mean systolic blood pressure by age group was 6-9mrnHg higher than Japanese standards by age.
3) Rate of hypertension in laborers was higher than in office workers (20.2% vs. 18.4%).
4) Rate of heredity of hypertension in hypertensive cases was higher than in normal tension cases (21.6% vs. 19.1%).
5) Rate of hypertension was higher in those residing in Nikko for more than 20 years than in those dwelling less than 20 years.
6) More obese cases were found among hypertension cases than among normal cases (11.3% ve. 9.1%).
7) Correlation between food (quantity, quality, etc.) and blood pressure was not observed.
8) More cases who indulge in alcoholic beverages were found among hypertension cases (34.6%) than those of normal (20.8%). No correlation was found between smoking and hypertension.
9) Albuminuria was found in 6.1% of hypertension cases.
10) No correlation was found between hypertension and pace of work. It is summarized that high rate of hypertension in the Nikko Copper Works may be primariry due to altitude, cold climate and not due to heredity, excessive drinking of alcoholic beverages, and physical constitutions.
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