# Influence of Body Weight Support Systems on the Abnormal Gait Kinematic
## 4 Discussion
In contrast, the better results of the COM and COP while waking under the ABWS system suggest that the lateral force in the pendulum effect was reduced. These results would be meaningful in implementing the ABWS system with higher unloading force in gait training and indicated that the modulated body weight unloading system type on the treadmill shows potential advantages in clinical implementation of gait training when comparing with the passive unmodulated body weight unloading. In Figure 9, the lost peak can be seen in the range of motion of the knee joint for the abnormal walking condition and abnormal walking under both the ABWS and CW system at all unloadingweight supported levels. The ankle angle patterns of all abnormal walking conditions were distorted and differed from the normal walking condition. The ranges of motion of the abnormal walking condition showed the analog shapes of the gait pattern of hemiplegia which were reported in previous studies [50; 51; 52]. These results suggested that the successful reproduction of the gait pattern of hemiplegia as the abnormal walking condition. One can see that the improvement in terms of ROM was not observed in this present study. The reason is that the experiment was carried out in the difficult conditions of abnormal walking with the rigid fixation of the right knee joint and the 3 kg-weight on the ankle joint. In Figure 8, the improvement of the MOS while walking under the ABWS system can be seen during the first double support phase, right single support phase, and the second double support phase. The CW system only improved the MOS at the first double support and the right single support phases. One should notice that the second double support phase is the transition phase from the abnormal side to the normal side. Therefore, the increment in the MOS while walking under the ABWS would be meaningful and help the subject walking more stable than in case of using the CW system. The negative MOS happened at the end of the single support phase, which represented for the unstable stage during dynamic walking, and the COM movement switched from the left to right and vice verse [47]. [PERSON] et al. indicated that the higher negative MOS might representation for the fast gait during dynamic walking [47]. The higher value of the negative MOS while walking under the ABWS may suggest a sign of the faster walking speed in comparison with the case of the CW system. In Table 1, the ABWS improved the stride length, step width, and right step length. The no significant difference of stride length and step length on the right between abnormal walking under the ABWS system and normal walking at 30% and 70% unloading levels indicated the successful correction of the gait kinematic. The CW system only improved the stride length and the right step length; however, the successful correction gait kinematic was not be found. When considering the stride length, step width, and step length, the ABWS system again showed better behavior in comparison with that CW system. The gait training process for the incomplete patient could be executed in the early stage and undergone many periods depending on the situation of the patient. [PERSON] et al. indicated that a valid prognosis of walking function in patients with the leg paresis on admission could be made in 3 weeks, and the recovery of walking function mainly occurs within the first 11 weeks after stroke; patients who experience functional recovery after that time are in fact few [1]. In the situation of the early stage of the gait training procedure, the high level of weight support would be necessary due to the frailty of the ability bearing the patient's full weight. Previous studies mostly implemented the unloading level up to 40% for the healthy subject and walking impaired patient [15; 19; 22; 36; 39]. Only a few studies investigated the effect of unloading force on gait at a high level (higher than 50% subject weight) [23; 36].