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Beat-by-beat variations of human heartbeat intervals (heart rate variability; HRV) contain fractal components with broad band, 1/fß spectra. In this review, we first revisited the topics “what is the fractal component?” and “why should it be extracted?” A new method called coarse graining spectral analysis (CGSA) was then introduced to extract the fractal components from HRV signal. This was followed by the discussion on the accuracy aspects of CGSA and the application to the actual HRV data.
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