title: An introduction to heart rate variability: methodological considerations and clinical applications.
authors.affiliation: Department of Physiology and Cell Biology, The Ohio State University Columbus, OH, USA.
authors.forename: George E
authors.initials: GE
authors.lastname: Billman
authors.affiliation: Division of Cardiology, Department of Internal Medicine, Institute of Clinical Medicine, University of Oulu Oulu, Finland.
authors.forename: Heikki V
authors.initials: HV
authors.lastname: Huikuri
authors.affiliation: Department of Cardiology, Regional Medical Center Opole, Poland.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Sacha
authors.affiliation: Department of Neurology, Medical University of Vienna Vienna, Austria.
authors.forename: Karin
authors.initials: K
authors.lastname: Trimmel
keywords: autonomic nervous system; cardiovascular disease; heart rate; heart rate dynamics; heart rate variability; risk assessment