1. Research Service, Malcom Randall Department of Veterans Affairs Medical Center, North Florida/South Georgia Veterans Health System, Gainesville, Florida.
2. Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida.
3. Department of Orthopedics and Rehabilitation, University of Florida, Gainesville, Florida.
4. Physiological Sciences, University of Florida, Gainesville, Florida.