Multifractal analysis of the day and night characteristics of heart rate variability

S. Ramchurn, A. Murray
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引用次数: 6

Abstract

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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多重分形分析昼夜心率变异性特征
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。
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