Can the Voluntary Drive to a Paretic Muscle be Estimated from the Myoelectric Signal during Stimulation

摘要: Patients with SCI sometimes recover lost function after using FES. This phenomenon, known as the carry-over effect, is not fully understood. One theory used to explain this mechanism that electrical stimulation of peripheral nerve causes antidromic action potentials reach anterior horn cells in time patient’s voluntary effort. may reinforce motor pathways and consequently restore control. However, has never been properly tested testing requires a method measuring drive. project aims find out whether it possible estimate drive from measured myoelectric signals. The based on an FES cycling system ability adjust intensity relating corresponding In paretic muscles, weak contraction produces EMG response. signal cannot be directly indication because presence stimulus artefact reflexes. Two methods were investigated A domain was RMS extracted range windows following pulse. approach unsatisfactory large variations seen amplitudes for same power output well low sensitivity change output. frequency then coherence between co-contracting muscles. It encouraging see area under curve β band reflected changes level. further tests showed also greatly influenced by exercise time, becoming unpredictable 3 minutes. conclusion, neither two muscles practical estimation