This report is concerned with the third-year survey on 110 farmers in Iwate Prefecture conducted twice in the summer and winter of 1957.
An administration test of the deficient nutrients during half a year was adopted in addition to the survey scheme previously conducted, in order to investigate the cause of hypertension from a different angle. The nutrients administered were vitamin A (3500 I. U. per day), B
1 (1mg), C (50mg), corn oil (30g), and methylteststeron (15mg) for old male subjects.
The results obtained are summarized as follows:
1) Biometrically, the body structure was not of a typical heavy-muscular worker type, but was rather similar to that of a city type. No remarkable difference was observed morphologically between the hypertensive and normal groups, except in skinfold thickess which was distinctly thicker in the hypertensives.
2) Basal metabolism was slightly higher than Japanese standard value, but not so high as usually seen in muscular workers.
3) Serum portein and haemoglobin were within the normal range. The serum cholesterol lay at the upper limit of Japanese normal range, and serum chlor concentration was a little beyond the normal level.
4) Excretion of nitrogen, creatinine and 17-ketosteroid into urine per day were below the average value of Japanese. Only chlor excretion exceeded the usual range. Moreover, levels of all the excretes mentioned above and urine volume were lower in the hypertensives than in the normal pressure group.
5) Among all nutrients administeredd during half a year, corn oil was found most effective to depress blood pressure and serum cholesterol, except a medicament methylteststeron, which seemed to he more effective than corn oil. Other nutrients, e. g. vitamine A, B1, C, were certainly effective for each respective deficiency sign, but not so effective in case of hypertension.
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