Response to letter regarding article, "physical activity and heart rate variability in older adults: the cardiovascular health study"

Affiliations

• ¹ 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.
• ² Department of Epidemiology, Harvard School of Public Health, Boston, MA.
• ³ Benjamin Leon Center for Geriatric Research and Education and Department of Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL.
• ⁴ Department of Epidemiology, University of Washington, Seattle, WA.
• ⁵ Department of Epidemiology, and Department of Medicine, Cardiovascular Health Research Unit, University of Washington, Seattle, WA, New York Academy of Medicine, New York, NY.
• ⁶ Heart Rate Variability Laboratory, Cardiovascular Division, Washington University School of Medicine, St. Louis, MO.
• ⁷ Department of Epidemiology, Harvard School of Public Health, Boston, MA, Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA.