MEASUREMENT OF BAROREFLEX GAIN FROM HEART-RATE AND BLOOD-PRESSURE SPECTRA - A COMPARISON OF SPECTRAL ESTIMATION TECHNIQUES
MEASUREMENT OF BAROREFLEX GAIN FROM HEART-RATE AND BLOOD-PRESSURE SPECTRA - A COMPARISON OF SPECTRAL ESTIMATION TECHNIQUES
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DOI：
10.1088/0967-3334/16/2/005
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发表时间：
1995-05-01
影响因子：
3.2
通讯作者：
MURRAY, A
中科院分区：
文献类型：
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作者：
CLAYTON, RH;BOWMAN, AJ;MURRAY, A
压力反射是连接血压和心率的生理控制系统。压力感受反射增益 α 可以根据心率和血压谱的比率来估计。本研究的目的是通过使用四种不同的光谱分析技术来量化所发生的估计的差异。记录了 10 名健康受试者的心电图和血压。使用快速傅立叶变换 (FFT)、零填充 FFT (FFTZ)、加窗自协方差函数的 FFT (ACVF) 和最大熵 (ME) 方法来估计频谱。对于每个受试者，计算 MF（0.05-0.15 Hz）和 HF（0.15-0.35 Hz）频段的 α 平均值。平均 alpha(MF) 在受试者之间存在差异（范围 2-10 ms mmHg(-1)），平均 alpha(HF)（范围 4-12 ms mmHg(-1)）也是如此。使用不同技术估计的 alpha(MF) 和 alpha(HF) 的平均差异很小。 alpha(MF) 的差异范围为 0.074 ms mmHg(-1)（FFTZ 与 ME）到 0.298 ms mmHg(-1)（FFT 与 ACVF），alpha(HF) 的差异范围为 0.057 ms mmHg(-1)（FFT 与 FFTZ）到 0.342 ms mmHg(-1)（ACVF 与 ME）。这些差异都不显着。使用不同的频谱分析技术不会显着影响 alpha 的估计。
The baroreflex is the physiological control system linking blood pressure and heart rate. Baroreflex gain, alpha, can be estimated from the ratio of heart rate and blood pressure spectra. The aim of this study was to quantify differences in estimates of a incur-red by using four different spectral analysis techniques. ECG and blood pressure were recorded from 10 healthy subjects. Spectra were estimated using fast Fourier transform (FFT), zero-padded FFT (FFTZ), FFT Of the windowed autocovariance function (ACVF), and maximum-entropy (ME) methods. For each subject a mean value of alpha was calculated in the MF (0.05-0.15 Hz) and HF (0.15-0.35 Hz) bands. Mean alpha(MF) varied between subjects (range 2-10 ms mmHg(-1)) as did mean alpha(HF) (range 4-12 ms mmHg(-1)). Mean differences in alpha(MF) and alpha(HF) estimated with different techniques were small. Differences in alpha(MF) ranged from 0.074 ms mmHg(-1) (FFTZ against ME) to 0.298 ms mmHg(-1) (FFT against ACVF) and those in alpha(HF) ranged from 0.057 ms mmHg(-1) (FFT against FFTZ) to 0.342 ms mmHg(-1) (ACVF against ME). None of these differences were significant. The use of different spectral analysis techniques does not significantly affect estimates of alpha.