frequency was 100Hz. All subjects in this study completed 3~5
trials and the kinematic parameters of each subject were
calculated using the mean of the 3 trials, and a subject’s sagittal
hip angles plots during gait cycle is illustrated in Fig.1. In order
to avoid difference among subjects, all kinematic variables
were further normalized with respect to the duration of the gait
cycle of each limb, as shown in Fig.2. (0%~60% denotes stance
phase; 60%~100% represents swing phase)[7].