Department of Health and Exercise Science, Wake Forest University, Winston-Salem, North Carolina. Department of Biostatistical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina. Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts. Department of Health Research and Policy and Stanford Prevention Research, Palo Alto, California. Department of Aging and Geriatric Research, University of Florida, Gainesville. General Internal Medicine and Geriatrics and Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois. Department of Epidemiology and Medicine, University of Pittsburgh, Pennsylvania. Department of Kinesiology, University of Massachusetts, Amherst. Exercise Science Department, Southern Connecticut State University, New Haven.