1. Malcom Randall Veterans Affairs Medical Center; Geriatric Research Education and Clinical Center; Gainesville FL USA
2. Department of Kinesiology; University of Rhode Island; Kingston RI USA
3. Department of Applied Physiology and Kinesiology; University of Florida; Gainesville FL USA
4. Department of Physiological Sciences; University of Florida; Gainesville FL USA
5. Department of Mechanical Engineering and Engineering Science; University of North Carolina at Charlotte; Charlotte NC USA