【摘要】 比较了经典谱估计与现代谱估计在心率变异性分析中的应用,指出了经典谱估计具有频率分辨率低和旁瓣泄漏的固有缺点,采用以自回归模型为代表的现代谱估计对心率变异性信号特别是短时心率变异性信号分析具有优越性,并对不同年龄段正常人的心率变异信号进行了分析和比较,分析结果表明:自回归模型功率谱估计在心率变异性分析中的有效性优于当前所使用的传统谱估计方法;随着年龄增长,HRV信号总能量及各频段能量明显减少.更多还原

【Abstract】 In heart rate variability(HRV)analysis, the classic power spectrum density (PSD) estimate based on FFT is low in frequency resolution and leak in side petal, the PSD estimate based on Auto Regressive (AR) Model was introduced in HRV frequency domain analysis and was compared with PSD based on FFT. The AR model method was used to analyze HRV signals of normal subjects of different age groups. The results show AR model PSD estimate has higher validity than classic PSD estimate; subjects of elder age groups have less HRV power than younger age groups.更多还原