Changes in the Hurst exponent of heartbeat intervals during physical activity (CROSBI ID 109246)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Martinis, Mladen ; Knežević, Andrea ; Krstačić, Goran ; Vargović, Emil
engleski
Changes in the Hurst exponent of heartbeat intervals during physical activity
The fractal scaling properties of the heartbeat time series are studied in different controlled ergometric regimes using both the improved Hurst rescaled range (R/S) analysis and the detrended fluctuation analysis (DFA). The long-time "memory effect" quantified by the value of the Hurst exponent H>0.5 is found to increase during progressive physical activity in healthy subjects, in contrast to those having stable angina pectoris, where it decreases. The results are also supported by the detrended fluctuation analysis. We argue that this finding may be used as a useful new diagnostic parameter for short heartbeat time series.
heartbeat fluctuations ; Hurst exponent
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Podaci o izdanju
70 (1)
2004.
012903
4
objavljeno
1539-3755
1550-2376
10.1103/PhysRevE.70.012903