tailieunhanh - báo cáo hóa học: " Effects of unilateral robotic limb loading on gait characteristics in subjects with chronic stroke"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Effects of unilateral robotic limb loading on gait characteristics in subjects with chronic stroke | Khanna et al. Journal of NeuroEngineering and Rehabilitation 2010 7 23 http content 7 1 23 J NER JOURNAL OF NEUROENGINEERING AND REHABILITATION RESEARCH Open Access Effects of unilateral robotic limb loading on gait characteristics in subjects with chronic stroke Ira Khanna41 Anindo Roy 42 2 3 4 MaryM Rodgers41 Hermano I Krebs42 4 5 Richard M Macko1 3 4 6 and Larry W Forrester41 3 4 Abstract Background Hemiparesis after stroke often leads to impaired ankle motor control that impacts gait function. In recent studies robotic devices have been developed to address this impairment. While capable of imparting forces to assist during training and gait these devices add mass to the paretic leg which might encumber patients gait pattern. The purpose of this study was to assess the effects of the added mass of one of these robots the MIT s Anklebot while unpowered on gait of chronic stroke survivors during overground and treadmill walking. Methods Nine chronic stroke survivors walked overground and on a treadmill with and without the anklebot mounted on the paretic leg. Gait parameters interlimb symmetry and joint kinematics were collected for the four conditions. Repeated-measures analysis of variance ANOVA tests were conducted to examine for possible differences across four conditions for the paretic and nonparetic leg. Results The added inertia and friction of the unpowered anklebot had no statistically significant effect on spatiotemporal parameters of gait including paretic and nonparetic step time and stance percentage in both overground and treadmill conditions. Noteworthy interlimb symmetry as characterized by relative stance duration was greater on the treadmill than overground regardless of loading conditions. The presence of the unpowered robot loading reduced the nonparetic knee peak flexion on the treadmill and paretic peak dorsiflexion overground p . Conclusions Our results suggest that for these subjects the added inertia and .