title: Complexity analyses show two distinct types of nonlinear dynamics in short heart period variability recordings.
abstract: 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.
authors: Laboratory of Complex System Modeling, Department of Biomedical Sciences for Health, University of Milan Milan, Italy ; IRCCS Galeazzi Orthopedic Institute Milan, Italy.
authors: Alberto
authors: A
authors: Porta
authors: Department of Cardiothoracic, Vascular Anesthesia and Intensive Care, IRCCS Policlinico San Donato Milan, Italy.
authors: Vlasta
authors: V
authors: Bari
authors: Department of Anesthesia and Intensive Care Unit, Humanitas Clinical and Research Center Rozzano, Italy.
authors: Andrea
authors: A
authors: Marchi
authors: IRCCS Fondazione Salvatore Maugeri Milan, Italy.
authors: Beatrice
authors: B
authors: De Maria
authors: Integrated Curriculum for Anthroposophic Medicine, University of Witten/Herdecke Witten, Germany ; Department of Medicine, Institute for Integrative Medicine, University of Witten/Herdecke Herdecke, Germany.
authors: Dirk
authors: D
authors: Cysarz
authors: Department of Biomagnetism, Grönemeyer Institute for Microtherapy, University of Witten/Herdecke Bochum, Germany.
authors: Peter
authors: P
authors: Van Leeuwen
authors: Research Laboratory in Health Elderly, Department of Physiotherapy, Federal University of São Carlos São Carlos, Brazil ; Cardiovascular Physiotherapy Laboratory, Department of Physiotherapy, Nucleus of Research in Physical Exercise, Federal University of São Carlos São Carlos, Brazil.
authors: Anielle C M
authors: AC
authors: Takahashi
authors: Cardiovascular Physiotherapy Laboratory, Department of Physiotherapy, Nucleus of Research in Physical Exercise, Federal University of São Carlos São Carlos, Brazil.
authors: Aparecida M
authors: AM
authors: Catai
authors: Department of Cardiology, S.L. Mandic Hospital Merate, Italy.
authors: Tomaso
authors: T
authors: Gnecchi-Ruscone
keywords: autonomic nervous system; cardiovascular control; gestational age; head-up tilt; heart rate variability; local prediction; multiscale analysis; time irreversibility