WO9306779-A1  BIOMEDIZINISCHE TECHNIK vol. 32, no. 10, October 1987, BERLIN (D) pages 250 - 254 G. A. HORTSMAN ET AL. 'Speziallaufband fuer Stand- und Ganguntersuchungen in Forshung und Klinik'US5474087-A  "A Pressure Mapping System for Gait Analysis," Sensors, pp. 21-25 (May 1991) Author Unknown;  Durie et al. "An Apparatus for Step Length Measurement" J. of Biomed. Engng. vol. 2 pp. 38-40 Jan. 1980;  G. A. Hortsman et al., "Speziallaufband fur Stand-und Ganguntersuchungen in Forshung und Klinik", Biomedizische Technik, vol. 32, No. 10, (1987) pp. 250-254;  Infotronic, "CDG-Computer Dyno Graphy" brochure (Date Unknown);  Kram et al., "A Treadmill-mounted Force Platform," American Physiological Society, pp. 1692-1698 (1989);  Motion Analysis Corp., "The Expertvision System" brochure (Date Unknown);  Oxford Medical Systems, "Vicon" brochure, (Date Unknown);  Unisen, "The Two Most Durable Machines in Your Club" brochure (Date Unknown)US5623944-A  "A Pressure Mapping System for Gait Analysis," Sensors, pp. 21-25 (May 1991), author unknown.;  "Technical Note. Rotating treadmill for the continuous measurement of anterior-posterior forces during walking," Med. & Biol. Eng. & Comput, 20, 519-522 (1982).;  G.A. Hortsman et al., "Speziallaufband fur Stand-und Ganguntersuchungen in Forshung und Klinik", Biomedizische Technik, vol. 32, No. 10, (1987), pp. 250-254.;  Hirokawa, "Biofeedback Gait Training System," Biom, XI-B, vol. 7B:1004-1009 (1988).;  Jansen et al., "Normal Gait of Young and Old Men and Women," Acta. Orthop. Scand., 53, 193-196 (1982).;  Jansen, "An Instrument Treadmill for Clinical Measurement of Ground Reaction Forces," publishing information unknown, written by Eric C. Jansen, MD, University of Copenhagen, Hellerup, Denmark, pp. 12-17.;  Kistler Instrument Corp., "Gaitway; Instrumented Treadmill System for Multiple Foot Strike Force Requirements," brochure (1994).;  Kram et al., "A Treadmill-mounted Force Platform," American Physiological Society, Journal of Applied Physiology, 67(4):1692-1698 (1989).;  Kram., "A Treadmill-mounted Force Platform," Abstract #295, XII International Congress of Biomechanics, Congress Proceedings, University of California, Los Angeles, 26-30 Jun. 1989.;  Martin et al., "Ground Reaction Forces and Frontal Plane Hip, Knee and Ankle Angles During Running on a Treadmill," Biom, XI-B, vol. 7B:645-649 (1988).;  Motion Analysis Corp., "The Expertivism System," brochure, dated unknown.;  Oxford Medical Systems, "Vicon," brochure, date unknown.;  Unisen, "The Two Most Durable Machines in Your Club," brochure, date unknown.