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How random is your heart beat? |
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| Authors: | Krzysztof Urbanowicz Jan J. ?ebrowski Janusz A. Ho?yst |
| Affiliation: | a Faculty of Physics, Warsaw University of Technology, Koszykowa 75, PL-00-662 Warsaw, Poland b Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany c Institute of Cardiology at Warszawa, Alpejska 42, 04-628 Anin, Poland |
| Abstract: | We measure the content of random uncorrelated noise in heart rate variability using a general method of noise level estimation using a coarse-grained entropy. We show that usually, except for atrial fibrillation, the level of such noise is within 5-15% of the variance of the data and that the variability due to the linearly correlated processes is dominant in all cases analyzed but atrial fibrillation. The nonlinear deterministic content of heart rate variability remains significant and may not be ignored. |
| Keywords: | 05.45.Tp 05.40.&minus a |
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