Phase transitions detected in complex time series by multifractal detrended fluctuation analysis
| Autor: | Yiu-Man Wong, Thomas C. Day, Joseph S. Tumulty, Brad Antanaitis |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | International Journal of Modern Physics B. 36 |
| ISSN: | 1793-6578 0217-9792 |
| Popis: | A distinctive fishtail feature in multifractal spectra derived from heart rate variability (HRV) data closely resembles similar features in plots of the Gibbs free energy versus reduced pressure for a van der Waals fluid below the critical temperature, and, in analogy to the nonideal fluid, signals a phase transition from one multifractal state to another. This fishtail feature, often overlooked or dismissed in previous studies, is observed most prevalently in unhealthy patients and suggests a realignment between multifractal variables and their thermodynamic analogs. The van der Waals analogy and subsequent alternate interpretation of multifractal variables and functions lead one to construct a three-dimensional heart health phase diagram reminiscent of a [Formula: see text] diagram for the van der Waals fluid. The diagram which makes use of the Maxwell width as a measure of heart health produces an orderly progression from healthy to unhealthy. |
| Databáze: | OpenAIRE |
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