Year: 2026
Type: article
Abstract: Muscle synergies describe how the central nervous system coordinates groups of muscles through common activation patterns, reducing the dimensionality of motor control. This work analyzes their extraction from 128-channel high-density electromyography (HD-EMG) recorded over the forearm during hand opening and closing tasks, using Non-Negative Matrix Factorization (NMF). Two synergies reconstructed muscle activity with a Variance Accounted For (VAF) above 97 %. The first, flexor-dominated, showed high inter-subject stability and was associated with grip generation and maintenance; the second, extensor, exhibited greater variability, consistent with individual strategies for stabilization and fine control during opening. Both activated in agreement with the biomechanical phases of grasping. This low-dimensional organization suggests applications as a biomarker of motor coordination in rehabilitation and as a reduced control space for more robust myoelectric interfaces.
Source: Jornadas de Automática
Institution: University of Alicante
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7204892108