1 Center for Cardiac, Pulmonary and Vascular Fitness, The Miriam Hospital, Providence, Rhode Island (Drs Buckley and Simmons and Mss Mahoney and Pierce); Department of Psychiatry and Human Behavior, Alpert Medical School of Brown University, Providence, Rhode Island (Dr Buckley); Center for Alcohol and Addiction Studies, Brown University School of Public Health, Providence, Rhode Island (Dr Wycoff); Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, Alpert Medical School of Brown University, Providence, Rhode Island (Dr Simmons); and Department of Kinesiology, University of Rhode Island, Kingston, Rhode Island (Dr Adami).