Frontiers in Physiology (Mar 2015)

Complexity analyses show two distinct types of nonlinear dynamics in short heart period variability recordings

  • Alberto ePorta,
  • Alberto ePorta,
  • Vlasta eBari,
  • Andrea eMarchi,
  • Beatrice eDe Maria,
  • Dirk eCysarz,
  • Dirk eCysarz,
  • Peter eVan Leeuwen,
  • Anielle C.M. Takahashi,
  • Anielle C.M. Takahashi,
  • Aparecida M. Catai,
  • Tomaso eGnecchi-Ruscone

DOI
https://doi.org/10.3389/fphys.2015.00071
Journal volume & issue
Vol. 6

Abstract

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Two diverse complexity metrics quantifying time irreversibility and local prediction, in connection with a surrogate data approach, were utilized to detect nonlinear dynamics in short heart period (HP) variability series recorded in fetuses, as a function of the gestational period, and in healthy humans, as a function of the magnitude of the orthostatic challenge. The metrics indicated the presence of two distinct types of nonlinear HP dynamics characterized by diverse ranges of time scales. These findings stress the need to render more specific the analysis of nonlinear components of HP dynamics by accounting for different temporal scales.

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