Detection of Volitional and Induced EMG for Functional Electrical Therapy

• Main Authors: Chin-Yi Wang, 王敬懿
• Other Authors: Jia-Jin Chen
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/61681144486121655129

碩士 === 國立成功大學 === 醫學工程研究所碩博士班 === 96 === Those surviving strokes may be left with physical impairments deeply affecting the activities of daily living and quality of life. Patients with asymmetrical lower limb functions are difficult to perform continuous and smooth reciprocal movements in the lower limb, such as walking and cycling. To enhance residual functions of patients with partial motor disorders, electrical stimulation (ES) combined with cycling exercise has been utilized as a rehabilitation technology recently. For the limb with residual function, during stimulating, muscle contraction is generated from two different excitation sources: volitional and external electrical stimulation. This muscle activation is referred as hybrid muscle activation. The aim of this study is to develop an EMG recording system, which includes the stimulus artifact suppressor and software and hardware implementation for extracting volitional and ES-induced EMG signals in dynamic movement during functional electrical therapy (FET). The separation of electrically evoked EMG and EMG interference can represent the force induced by the electrical stimulation and residual movement ability of the stroke subject. In addition, we design Peak-to-Peak (PTP) detector for real-time measurement of PTP amplitude of ES-induced EMG. Our pilot results show that signal processing can separate volitional and stimulus EMG from artifact-free overall EMG. The PTP detector can accurately and sensitively capture PTP value of stimulus-induced EMG during dynamic movement. The information acquired can serve as a training protocol or a control strategy for an FES-cycling induced by hybrid muscle activation in future study which therefore would benefit wide ranges of physically handicapped including stroke, incomplete SCI, and able-bodied elderly with varied volitional muscle functions.