Reduction of correlation dimension in human respiration by inhaling a mixture gas of 5 % carbon dioxide and 95 % oxygen

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• 作者：Suyama ; Hisashi ; Burioka ; Naoto ; Sako ; Takanori ; Miyata ; Masanori ; Shimizu ; Eiji
• 关键词：Nonlinear analysis ; Correlation dimension ; Attractor ; Central chemoreceptor ; Respiration
• 刊名：Biomedicine and Pharmacotherapy
• 出版年：2003
• 出版时间：October, 2003
• 年：2003
• 卷：57
• 期：Supplement 1
• 页码：116-121
• 全文大小：150 K

文摘

In order to investigate the effect of the respiratory control system on deterministic behavior in respiration, we used nonlinear analysis in subjects breathing a mixture gas of 5 % carbon dioxide (CO₂) and 95 % oxygen (O₂) (CO₂–mixed gas). The respiratory movements during breathing air or CO₂–mixed gas in eight healthy volunteers were measured. We estimated the values of the correlation dimension (D2) in respiratory movement using Grassberger–Procaccia algorithm. The respiratory movements during inhaling either air or CO₂–mixed gas showed a nonlinear behavior using surrogate data method. The values of D2 in respiratory movement during inhaling CO₂–mixed gas (1.77 ± 0.17) were significantly smaller than those during inhaling air (2.52 ± 0.60) (P < 0.05). This might be related to a prompt change in the nonlinear signal from the central respiratory chemical system.