Changes in the Hurst exponent of heartbeat intervals during physical activities

Details Changes in the Hurst exponent of heartbeat intervals during physical activities Changes in the Hurst exponent of heartbeat intervals during physical activities

2002-12-06

arxiv.org/abs/physics/0212029v1

Physics

Medical Physics

9 pages, LaTex, 4 figures

Scientific paper

The fractal scaling properties of the heartbeat time series are studied in a controlled ergometric regime using the Hurst rescaled range R/S analysis. The long-time "memory effect" quantified by the value of the Hurst exponent $H>0.5$ is found to increase during progresive physical activity at healthy subjects in contrast to those having stable angina pectoris (SAP), where it is decreasing. We argue that this finding may be used as a useful new diagnostic parameter for short heartbeat time series.

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