title: Response to letter regarding article, "physical activity and heart rate variability in older adults: the cardiovascular health study".
authors.affiliation: Department of Epidemiology, Harvard School of Public Health, Boston, MA, Research Centre in Physical Activity, Health and Leisure, Faculty of Sport, University of Porto, Portugal.
authors.forename: Luisa
authors.initials: L
authors.lastname: Soares-Miranda
authors.affiliation: Department of Epidemiology, Harvard School of Public Health, Boston, MA.
authors.forename: Jacob
authors.initials: J
authors.lastname: Sattelmair
authors.affiliation: Benjamin Leon Center for Geriatric Research and Education and Department of Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL.
authors.forename: Paulo
authors.initials: P
authors.lastname: Chaves
authors.affiliation: Department of Epidemiology, University of Washington, Seattle, WA.
authors.forename: Glen
authors.initials: G
authors.lastname: Duncan
authors.affiliation: Department of Epidemiology, and Department of Medicine, Cardiovascular Health Research Unit, University of Washington, Seattle, WA, New York Academy of Medicine, New York, NY.
authors.forename: David S
authors.initials: DS
authors.lastname: Siscovick
authors.affiliation: Heart Rate Variability Laboratory, Cardiovascular Division, Washington University School of Medicine, St. Louis, MO.
authors.forename: Phyllis K
authors.initials: PK
authors.lastname: Stein
authors.affiliation: Department of Epidemiology, Harvard School of Public Health, Boston, MA, Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA.
authors.forename: Dariush
authors.initials: D
authors.lastname: Mozaffarian
mesh_terms: D002318:Cardiovascular Diseases / Q000503:physiopathology*; D015716:Electrocardiography, Ambulatory; D005260:Female; D006304:Health Status; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D016138:Walking / Q000502:physiology*