バリストカルジオグラフィーに關する研究(第1報) : 簡易型バリストカルジオグラフィーにおける横木の研究 : 特に横木と脛骨との間の結合状態による影響について

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1. Changes in wave form of B.C.G. induced by the weight of a wooden shin-bar were studied in 7 cases (6 normal, 1 coarctation of the aorta) by placing the bar mounted a Smith' type pickup on the upper and the lower shins. In both situations especially in the latter, (1) IJ-segment amplitude, (2) JK : IJ ratio and (3) diastolic waves were augmented.2. In the above cases, the effect of the fixing device on the B.C.G. was studied. By the use of this fixing device, there was only a slight increase in IJ-amplitude, but no increase in other two subjects.3.By comparing them with the waves simultaneously recorded by von Wittern's table, it is concluded that all the above three changes are due to incompleteness of recording techniques.By measuring the natural frequencies and damping factors of human body and shin-bar, and by assuming the main frequency component of IJ-, JK-segment from their wave durations, I considered that the above wave form distortions were due to the vibrations of each component of the complex vibrating system composed of table (base), body structure and shin-bar.
1959-08-20