Figure 2

Parameters definition used for gait analysis. Right side pictures were from one normal person, and left side diagram present parameters for gait pattern analysis. In the pictures and diagram, the y-axis represents the normalized angular velocity (NAV), and the x-axis represents time (s). a-a’: NAV for toe-off (=minimum value of NAV); b-b’: NAV of the mid-swing phase (=maximum value of NAV); c-c’: NAV for heel strike; d-d’: NAV for the mid-stance phase; e: time of maximum toe-off; f: time of maximum swing phase; g: time of maximum heel strike; h: time of maximum mid-stance phase. Down-slope means the down-slope of NAV, Up-slope means the up-slope of NAV.