心理应激时青年人R-R间期变异性的谱分析

Spectral Analysis of R-R Intervals in Adolesent Persons during Mental Stress

本文用自回归模型的功率谱密度分析来定量评价应激态时R－R间隔信号的能量谱，分别求得其低频段（LF：0．05－0．15Hz）和高频段（HF：0．15－0．SHz）的功率话密度。结果：应激态时，LF的功率话值比对照状态明显增加（P＜0．001），而HF的功率潜值则显著成小（P＜0．001），且高频段的中心频率较对照状态时明显加快（P＜0．001）。表明心率变异性（R－R间隔）的功率谱分析作为一种无创性指标，为我们评价心理应激时心血管系统植物神经活动情况提供了有效的方法。

In this study, power spectrum analysis of the autoregressive model was used to quantitatively esti-mate the power spectrum of R-R intervals in adolesent during the state of the mental stress. The power spectrumdensity of the lower frequency (LF: 0. 05～0. 15Hz) and the high frequency(HF: 0. 15～0. 5Hz) component wereacquired. The results showed that during the mental stress the HF component decreased significantly (P<0. 001)while the LF component increased re1atively and the center frequency of the HF increased remarkably (P<0. 001).This suggests that the spectral analysis of heart rate variability (R-R interval) offers an efficient non-invasivemethod to assess the autonomic nerve activity of cardiovascular system during the stress condition.