Correlated and uncorrelated regions in heart-rate fluctuations during sleep.

@article{Bunde2000CorrelatedAU,
  title={Correlated and uncorrelated regions in heart-rate fluctuations during sleep.},
  author={Armin Bunde and Shlomo Havlin and Jan W. Kantelhardt and Thomas Penzel and J{\"o}rg Peter and Karlheinz Voigt},
  journal={Physical review letters},
  year={2000},
  volume={85 17},
  pages={
          3736-9
        }
}
Healthy sleep consists of several stages: deep sleep, light sleep, and rapid eye movement (REM) sleep. Here we show that these sleep stages can be characterized and distinguished by correlations of heart rates separated by n beats. Using the detrended fluctuation analysis (DFA) up to fourth order we find that long-range correlations reminiscent to the wake phase are present only in the REM phase. In the non-REM phases, the heart rates are uncorrelated above the typical breathing cycle time… CONTINUE READING

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