多重分形分析昼夜心率变异性特征

S. Ramchurn, A. Murray
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引用次数: 6

摘要

研究正常人RR心率变异性特征,比较白天和夜间的多重分形特征。RR间期从正常受试者的24小时数字动态心电图记录中获得,从中午开始。每24小时被分成4块,每块6小时分别进行分析。从午夜到早上6点的第三个时段完全被控制住了。使用小波变换多重分形形式化分析6小时块。各光谱在赫斯特指数(h)极限0.07 ~ 0.29之间达到峰值。在一名受试者中,夜间光谱没有一致的夜间峰值,无法分析。在光谱峰明确的被试中,h的夜间峰值位置往往大于其他3个6小时时段,说明夜间睡眠期间RR间隔的分形特征不同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multifractal analysis of the day and night characteristics of heart rate variability
The RR heart rate variability characteristics of normal subjects were studied to compare the multifractal characteristics during day and night. The RR intervals were obtained from 24-hour digital Holter ECG recordings of normal subjects, starting at midday. Each 24 hour period was split into 4 blocks of 6-hour which were analysed separately. The overnight period was fully contained in the third block, between midnight to 6 a.m. The 6-hour blocks were analysed using a wavelet transform multifractal formalism. Each spectrum peaked between the Hurst exponent (h) limits of 0.07 and 0.29. In one subject the overnight spectrum did not have a consistent overnight peak and could not be analysed. In the subjects with well-defined spectral peaks, the overnight peak position of h tended to be greater than that for any of the other three 6-hour periods, indicating that the fractal characteristics of the RR intervals differ during the overnight sleep period.
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