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I.緒言 著者は,前報1)において,2方向Ballistocar—diographを使用し,18〜38歳の健常成人における,IJ脚呼吸性変動を,その方向および振巾について考察した。すなわち,いわゆるFrontal plane vector ballistocardiogramのIJ脚呼吸性変動は,その方向が,心軸の呼吸性移動とある程度の関係を有するように見られたが,方向の変化よりも,IJ脚振巾自体の変動,前額面より見たいわゆる心力の呼吸性変動の方が著明で,これが頭足方向IJ脚振巾呼吸性変動に,主なる変化を与えていることを述べた。
2方向Ballistocardiogramで,その所見の年齢上昇に伴う変化についての報告は,Dock2),Honig3),March4)など数多くの研究者が出しているが,IJ脚の前額面における方向,前額面IJ脚振巾の呼吸性変動比についての報告は少いので,著者は,今回これらの事項につき報告する。
Using modified von Wittern's type two dimensional ballistocardiograph, the respiratory variation of the IJ segment of 46 normal males over 40 years of age was studied.
The direction of the IJ vector on the frontal plane had a tendency to incline to the right with advancing of age.
In the group of 40~50 years of age, the respiratory variation of the longitudinal IJ amplitude is affected little by the respiratory change in the IJ direction on the frontal plane, but is chiefly affect ed by the change in IJ amplitude, so-called respiratory variation of the ballistic force.
On the other hand, in the group of over 60 years of age, the respiratory change in longitudinal IJamplitude has a possibility to be affected much by the respiratory change in the IJ direction on the frontal plane.
However, even if we admitt the above possibility, the respiratory variation of the IJ amplitude on the frontal plane still increases with advancing of age.
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