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G. R. Tack, Y. M. Han, J. S. Choi, J. H. Yi, Y. T. Lim, J. H. Jun, S. K. Park, D. Stephanyshin, S. H. Park, Relationship between Walking Speed and Smoothness of Movement. Korean Journal of Sport Biomechanics, Vol. 16, No. 1, pp.11-17, 2006. The purpose of this study was to evaluate the smoothness of movement during various walking speeds. Based on the maximum smoothness theory (or the minimum jerk theory), we hypothesized that the walking speed at the maximum smoothness (or minimum normalized jerk) is the same as that at the minimum energy consumption. Eleven university students participated in treadmill walking experiment with 11 different walking speeds (1.11, 1.19, 1.25, 1.33, 1.56, 1.78, 1.9, 2, 2.11, 2.33, and 2.47m/sec). Normalized jerk at 15 markers and the center of mass was calculated. Results showed that there existed a quadratic relationship between the normalized jerk of the vertical direction at the center of mass and the walking speed. As the walking speed increased, the normalized jerk of all directions at the heel decreased. Our hypothesis that the previously published energetically optimal walking speed (1.25 ~ 1.4m/s) is the same as the minimum jerk speed (1.78m/s) did not agree with this result. The minimum normalized jerk at the center of mass occurred at the walking speed of 1.78m/s which was the preferred walking speed by subjects' questionaries. Further studies concerning the energetically optimal walking speed, preferred walking speed, and walk-run transition speed or run-walk transition speed are necessary based on actual energy consumption experiment and various multi-dimensional analysis.