直結式反射光電プレチスモグラフによる皮膚容積脈波，特に基線動揺の不一致性に関する研究

Volume pulse in human skin recorded by direct coupled-reflexion photoelectric plethysmograph, with special reference to spontaneous fluctuations of its base line

I．緒言

　高木及びその協同研究者によつて，人体皮膚表面へ加えられた圧迫は，自律神経機能のみならず，体神経機能へも大きい影響を及ぼすことが明かにされた^1）。側胸部の非対称的圧迫によつて，頬部，前胸部の皮温は両側共下降するが，圧迫側の下降の方が著しいと報告されている^2）。ここに述べる実験は皮温に最も関係の深い皮膚血流変化をPlethysmographによつて時間的に更に微細に追求し沢田の身体部位による自然動揺の相同性を追試すると共に，進んで皮膚圧反射の中枢神経機序研究の基礎を確立しようとしたものである。

Blood volume. changes of the thumb, big toe and forehead were observed in various conditions with a use of reflexion photoelectric plethysmograph (R. P. P. )

In normal persons, rest in bed, spontaneous fluctuations or vasomotor responses induced by stimuli were caused in complete coincidence between the thumb and toe, or left and right side. Different pattern of fluctuations were observed in forehead.

For a while after lying in supine position, no coincidence of fluctuations were often found between lett and right side, especially in finger and toe. Although they give an apperarance of antiphase variation between the two, it could be regarded in most case to be induced by the increase of phase-shift. Causes of these discrepancy of fluctuations were discussed.

A definite correlation was not verified between the R. P. P. and skin potential changes.