Quantification of scaling exponents and crossover phenomena in nonstationary heartbeat time series.

@article{Peng1995QuantificationOS,
  title={Quantification of scaling exponents and crossover phenomena in nonstationary heartbeat time series.},
  author={Chung-Kang Peng and Shlomo Havlin and Harry Eugene Stanley and Ary L. Goldberger},
  journal={Chaos},
  year={1995},
  volume={5 1},
  pages={
          82-7
        }
}
The healthy heartbeat is traditionally thought to be regulated according to the classical principle of homeostasis whereby physiologic systems operate to reduce variability and achieve an equilibrium-like state [Physiol. Rev. 9, 399-431 (1929)]. However, recent studies [Phys. Rev. Lett. 70, 1343-1346 (1993); Fractals in Biology and Medicine (Birkhauser-Verlag, Basel, 1994), pp. 55-65] reveal that under normal conditions, beat-to-beat fluctuations in heart rate display the kind of long-range… 

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