Scale invariance in the nonstationarity of human heart rate

Pedro Bernaola-Galván, Flamen Ch Ivanov, Luís A. Nunes Amaral, H. Eugene Stanley

Research output: Contribution to journalArticlepeer-review

229 Scopus citations


We introduce a segmentation algorithm to probe the temporal organization of heterogeneities in human heartbeat interval time series. We find that the lengths of segments with different local mean heart rates follow a power-law distribution and show that this scale-invariant structure is not a simple consequence of the long-range correlations present in the data. The differences in mean heart rates between consecutive segments display a common functional form, but with different parameters for healthy individuals and for heart-failure patients. These findings suggest that there is relevant physiological information hidden in the heterogeneities of the heartbeat time series.

Original languageEnglish (US)
JournalPhysical review letters
Issue number16
StatePublished - Oct 2 2001

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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