Short and long term non-linear analysis of RR variability series

G. Baselli, S. Cerutti, A. Porta, M. G. Signorini

Research output: Contribution to journalArticlepeer-review


The complexity of RR variability is approached in the short and in the long term by means of black-box data analysis. Short term series of a few hundred beats are explored by means of informational entropy and predictability indexes. A correction to biases toward false determinism is performed assuming maximum uncertainty, whenever data do not furnish sufficient recurrences. Non-randomness and non-linearity are tested by means of surrogate data provided by random shuffling and phase randomization respectively. In the long term of the 24-h or of several hours, similar tests based on mutual information are applied and validated by means of surrogate series. In addition the state space reconstruction is carried out by means of state space non-linear filtering addressing directly the reconstructed trajectories. In this condition, parameters characterizing the hypothetical attractor, mainly the maximum Lyapunov exponent, can be reliably identified.

Original languageEnglish
Pages (from-to)21-32
Number of pages12
JournalMedical Engineering and Physics
Issue number1
Publication statusPublished - 2002


  • Cardiovascular variability
  • Entropy
  • Lyapunov exponents
  • Mutual information
  • Predictability
  • Surrogate data

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Psychology(all)


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