Tham khảo tài liệu 'recent advances in biomedical engineering 2011 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Advantages of virtual reality technology in rehabilitation of people with neuromuscular disorders 309 level 1 the torque variation could be within 30 15 for the level 2 20 10 and for the level 3 10 5 of the accurate torque required to hit the target. Subjects 10 neurologically intact volunteers SD years SD kg SD cm participated in the virtual environment task and protocol development and preliminary evaluation. The volunteers had no muscular-skeletal impairment or any disease that would affect motor control capabilities. Besides a 12-year old boy with cerebral palsy CP II spastic diparesis 149 cm height weight 48kg functional electrical stimulation 1-ch peroneal nerve 1 hour day crouch gait poor selective motor control a patient of the Rehabilitation hospital voluntarily participated in the case study due to his good cognitive capabilities. The child had no prior experience with VR. The methodology was approved by local ethics committee and the subjects the subject s parents gave informed consent. Protocol The subjects were seated on the Biodex reclining chair. Stabilization of the subjects was achieved by placing velcro straps across the chest around the waist just above the right knee and just above the right ankle which secured the right lower leg to the input shaft of the dynamometer. The dynamometer lever was set to 45o flexion and the dynamometer operated in goniogram position control Cikajlo 2008 or isometric mode Dvir 2004 . In addition we visually aligned the estimated transverse rotational axis of the dynamometer. The surface EMG electrodes were placed on the right lower extremity s quadriceps muscle. The entire test procedure was repeated for the subjects over 3 consecutive days at approximately the same time of the day to limit the extent of possible diurnal variation. Each day the VR task for maximal joint torque assessment Fig. 1 was performed 3 times for knee flexion and 3 times for knee extension. The protocol
