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It has been reported that the voltage criteria in electrocardiography used for left ventricular hypertrophy (LVH) in Caucasians are not applicable to Negroes and Asian people. We already reported th...e differences in the voltage among Uygur, Kazak and Japanese, and also showed the significance of left ventricular voltage (SV1+RV5) in anthropology. However, there is no longitudinal study about the voltage in the same districts. The aim of this study is to clarify both the temporal change of electrocardiological left ventricular voltage and its physiolo-anthropological significance in Japanese normal male adolescent. The subjects consist of 1,605 to 1,925 freshmen per each year who admitted from 1981 to 1993 and had neither cardiomyopathy nor conduction disturbances such as WPW syndrome, right or left bundle brach block. SV1+RV5,(6), RaVF and R-R interval were estimated each year and those were compared between each year. The results were following that: 1)Both SV1+RV5 and RaVF gradually decreased from 3.930±0.924 mV in 1981, with the rate of 0.4512xlogx/year. (y=+3.9728-0.4512xlogx. (r=0.957, P<0.001)) 2)The prevalence of left ventricular hypertrophy according to Mori's criteria showed a significant decrease yearly from 12.69 % in 1983 to 2.88% in 1993. (y=+11.917-0.680X, (r=0.907, P<0.001) (y=13.166×10-0.043x, (r=0.933)) 3)Mean R-R interval showed the significant decrease yearly. (y=-0.150x+22.897 (r=0.739, P<0.01)) 4)No significant correlations of left ventricular voltage with stature, body weight or blood pressure were observed each year. These results suggest that the left ventricular voltage in normal male adolescent is a parameter of physiological activity rather than a barometer of left ventricular hypertrophy and Japanese male adolescent have been losing their physiological activity.show more
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