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KMID : 0371019890220010008
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Journal of Preventive Medicine and Public Health
1989 Volume.22 No. 1 p.8 ~ p.13
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Epidemiology and control of hypertension in Japan
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Sasaki, Naosuk
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Abstract
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It is an honor and my great pleat pleasure to give the special lecture of the 40th Annual Meeting of Korean Society for Preventive Medicine and I also wish to thank your chairman, Dr. Lee for his kind introduction. The lecture I am presenting is about epidemiological findings on hypertension in our studies which is carried on during around 35 years in our Department of Hygiene Hirosaki University School of Medicine, including some aspects of the relationship between daily salt intake and hypertension, and also I would like give the recent information on the results of the intervention for the prevention of stroke and hypertension in Japan.
First slide is the reprint of the paper which is presented by Dr. L.K. Dahl on the possible role of salt intake in the development of essential hypertension in the international symposium on hypertension held at Berne in 1960 (Lewis).
In the symposium he reported the evidence that salt ingestion may be related to human hypertension based on the results of the epidemiological studies, including the data of Japan, in the figure on the correlation of average daily salt intakes with prevalence of hypertension in different geographic areas and among different races.
These slide shows the distribution of death rate per 100,000 males aged 30-59 years from cerebral hemorrhage in various regions of Japan and average daily salt intakes of farmers in 4 regions added to original papers which we reported in Human Biology in 1957 (Eiji et al., 1957).
This is the first scene of our epidemiological studies on stroke and hypertension carrying instruments for the determination of blood pressure on the trailer and visiting farmers in their homes from door to door. We started epidemiological studies on stroke and hypertension, especially in the inhabitants of the Northeast Japan, in 1954.
At that time there was no definite explanation has been given for the fact that stroke is so common in Japan, and also there was no data on blood pressure of the population except the data of patients in clinics or the data from life insurance applicants. First we collected the data of mortality from stroke by descriptive epidemiological studies. As regards the death rate from stroke in Japan there exist a couple of distinguishing features. The first one is that there is throughout the country a marked geographical difference in the death rate. The second one is seasonal variation, this being low in summer and high in winter. The third one is decline in the death rate from stroke during the periods of World War II. It appears likely that these above-mentioned characteristics can be the best clues to the epidemiological research for the exploration into the nature of stroke or of hypertension considered to underlie it.
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