Simplified method for estimating parasympathetic nervous activity by Lorenz plot of ECG RR intervals

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  • 心電図ＲＲ間隔のローレンツプロットによる副交感神経活動の簡易推定法の開発
  • シンデンズ RR カンカク ノ ローレンツ プロット ニ ヨル フクコウカン シンケイ カツドウ ノ カンイ スイテイホウ ノ カイハツ

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Abstract

Several studies have been made on that the power of the high frequency components (HF) from 0.15 to 0.40Hz in heart rate variability (HRV) reflects the parasympathetic nervous activity. The purpose of this study is to show the evaluation method by applying Lorenz plot (LP) at RR intervals as a new evaluation index of the parasympathetic nervous activity. All the data of LP is plotted on the y=x axis that is the projective line. On the y=x axis, mean (m) and standard deviation (σx) of the distance from the coordinate origin are calculated. In the same way, on the y=-x axis, standard deviation (σ-x) is calculated. Ellipse area S showing variation of LP is calculated by S=π×σx×σ-x. The several phases of the experiment are performed in each subject. As a result, the significance (p<0.001) is shown between HF, m and S. The formula [y=0.592×m+0.238×S] is obtained by multiple regression analysis, and the significance (p<0.001) is shown between y and HF. This might indicate that LP is a reliable evaluation technique that takes place of HF.

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