1. Department of Kinesiology and Applied Physiology, University of Delaware, 5 Innovation Way, Suite 300, Newark, DE 19711 e-mail:
2. Advanced Design and Manufacturing Division, U.S. Army Edgewood Chemical Biological Center, Edgewood, MD 21010
3. Department of Mechanical Engineering, Biomechanics and Movement Science Interdisciplinary Program, Department of Kinesiology and Applied Physiology, Department of Biomedical Engineering, University of Delaware, Newark, DE 19711