Neuromuscular control before and after independent walking onset in children with cerebral palsy. High-density electromyography isometric isotonic muscle synergy wrist motion.Ĭopyright © 2022 Geng, Chen, Zhao, Cheung and Li.īekius A., Zandvoort C. This work may lead to an appropriate neuromuscular analysis method for motor function evaluation in clinical settings and provide valuable insights for the prescription of rehabilitation training therapies. Overall, our findings suggest that applying muscle synergy analysis to HDEMG is feasible, and that the traditional muscle synergies defined by whole-muscle components may be broadened to include sub-muscle components represented by the HDEMG channels. Both intra- and intermode similarity of muscle synergies were consistently robust to electrode configurations regardless of the similarity metric used. We observed high similarity of muscle synergies across different tasks within each training mode, but decreased similarity of muscle synergies across different training modes. Next, for a closer look at the mode-specific synergies and the synergies shared by the two training modes, k-means clustering was applied. Then, how the activation coefficients modulate the excitation of specific synergy under each mode was examined by pattern recognition. The cosine of principal angles (CPA) and the Euclidian distance (ED) between synergy vectors were used to evaluate the intra- and inter-mode similarity of muscle synergies. Three different HDEMG electrode configurations were used for comparison and validation of the extracted muscle synergies. Surface HDEMGs were recorded from healthy subjects ( N = 10). Here, modulation of muscle synergies within and across the isometric and isotonic training modes for strengthening muscles across the wrist were investigated. To represent the subtle variation of neuromuscular activities from the smaller forearm muscles during wrist motion, we proposed to apply muscle synergy analysis to preprocessed high-density electromyographic data (HDEMG). Clarifying the modulation of muscle synergies under different strength training modes is important for the rehabilitation of motor-impaired patients. Muscle synergy is regarded as a motor control strategy deployed by the central nervous system (CNS).
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