1. From the Department of Physical Therapy (R.A.) and Department of Internal Medicine (M.A.P.), Virginia Commonwealth University, Health Sciences Campus, Richmond, Va; VA Palo Alto Health Care System (J.M., J.A.), Cardiology Division, Stanford University, Palo Alto, Calif; LeBauer Cardiovascular Research Foundation (D.B., P.C.), Greensboro, NC; and University of Milano (M.G.), San Paolo Hospital, Cardiopulmonary Laboratory, Cardiology Division, University of Milano, San Paolo Hospital, Milano, Italy.