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This field survey was performed in the resident of Yonaguni Island, which was lacated in the far west or Japan, to study the difference of health and medical paramenters between urban and country. Thi...s paper describes mainly on blood pressure and left ventricular voltage of ECG. The subjects included 483 male and 524 female adults, with age from 20 to 84 years. SV1＋RV5 of ECG was used as a parameter of left ventricular voltage. The blood pressure in both the men and the women increased with age, although that of the women showed the higher rate of rise with age than that of the men. The women revealed lower blood pressure in each decade than the men, particularly in the younger ages. Compared with the reported mean value of bood pressre in Japanese, that of Jonaguni showed a tendency to be lower in both the men and the women, and in each decade. The voltage of SV1＋RV5 was markedly higher in the men than in the women, particularly in the second decade. The voltage of the men sharply decreased with age, while that of the women showed no change with age. This correlation between voltage and age was also seen in the subjects with none of abnormalities in the medical examination. The incidence of high voltage in SV1+RV5 in the normal young adults was higher in Jonaguni than in Urban (Fukuoka city). On the other hand, there was a significant correlation between the voltage of SV1＋RV5 and blood pressure in both the men and the women. Moreover, systolic pressure in both the men and women correlated with total cholesterol, % fat and heart rate. These significant differences in blood pressure and left ventricular voltage between urban and country were discussed from the view points of social and environmental factors.show more
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