Nollo G, Speranza G, Grasso R, Bonamini R, Mangiardi L, Antolini R
Istituto Ricerca Scientifica e Tecnologica (IRST) Trento, Italia.
J Electrocardiol. 1992 Jan;25(1):9-17. doi: 10.1016/0022-0736(92)90124-i.
The spontaneous beat-to-beat variability of the ventricular repolarization duration was investigated in 21 healthy subjects (age 25-71 years; mean, 40 years) during the basal state in a recumbent position. For each subject, approximately 1,000 consecutive cycles were analyzed with an automated technique. The time series of the RR, QT, and RT intervals generate histograms that approximate normal distributions and have mean standard deviations of 57.0 ms, 5.4 ms, and 4.3 ms, respectively. Spectral analysis was used to detect rhythmical oscillations in these time series. The power spectra densities of both heart rate and ventricular repolarization during show peaks in the same frequency bands: low frequency (0.05-0.12 Hz) and high frequency (0.2-0.4 Hz). The power distribution between these two bands observed in the ventricular repolarization duration spectra was found to be the reverse of that in heart rate spectra (p less than 0.005).
在21名健康受试者（年龄25 - 71岁；平均40岁）处于卧位的基础状态下，研究了心室复极持续时间的逐搏自发变异性。对每个受试者，使用自动化技术分析了约1000个连续心动周期。RR、QT和RT间期的时间序列生成了近似正态分布的直方图，其平均标准差分别为57.0毫秒、5.4毫秒和4.3毫秒。采用频谱分析来检测这些时间序列中的节律性振荡。心率和心室复极期间的功率谱密度在相同频带出现峰值：低频（0.05 - 0.12赫兹）和高频（0.2 - 0.4赫兹）。发现在心室复极持续时间频谱中观察到的这两个频带之间的功率分布与心率频谱中的相反（p小于0.005）。
