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Multifractal Analysis of Human Heartbeat in Sleep |
| DING Liang-Jing;PENG Hu;CAI Shi-Min;ZHOU Pei-Ling |
| Department of Electronic Science and Technology, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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DING Liang-Jing, PENG Hu, CAI Shi-Min et al 2007 Chin. Phys. Lett. 24 2149-2152 |
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Abstract We study the dynamical properties of heart rate variability (HRV) in sleep by analysing the scaling behaviour with the multifractal detrended fluctuation analysis method. It is well known that heart rate is regulated by the interaction of two branches of the autonomic nervous system: the parasympathetic and sympathetic nervous systems. By investigating the multifractal properties of light, deep, rapid-eye-movement (REM) sleep and wake stages, we firstly find an increasing multifractal behaviour during REM sleep which may be caused by augmented sympathetic activities relative to non-REM sleep. In addition, the investigation of long-range correlations of HRV in sleep with second order detrended fluctuation analysis presents irregular phenomena. These findings may be helpful to understand the underlying regulating mechanism of heart rate by autonomic nervous system during wake--sleep transitions.
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| Keywords:
89.90.+n
87.10.+e
87.19.Hh
05.45.Tp
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Received: 24 January 2007
Published: 25 June 2007
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