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• W4384525245 abstract "Isometric force generation and kinematic reaching in the upper extremity has been found to be represented by a limited number of muscle synergies, even across task-specific variations. However, the extent of the generalizability of muscle synergies between these two motor tasks within the arm workspace remains unknown. In this study, we recorded electromyographic (EMG) signals from 13 different arm, shoulder, and back muscles of ten healthy individuals while they performed isometric and kinematic center-out target matches to one of 12 equidistant directional targets in the horizontal plane and at each of four starting arm positions. Non-negative matrix factorization was applied to the EMG data to identify the muscle synergies. Five and six muscle synergies were found to represent the isometric force generation and point-to-point reaches. We also found that the number and composition of muscle synergies were conserved across the arm workspace per motor task. Similar tuning directions of muscle synergy activation profiles were observed at different starting arm locations. Between the isometric and kinematic motor tasks, we found that two to four out of five muscle synergies were common in the composition and activation profiles across the starting arm locations. The greater number of muscle synergies that were involved in achieving a target match in the reaching task compared to the isometric task may explain the complexity of neuromotor control in arm reaching movements. Overall, our results may provide further insight into the neuromotor compartmentalization of shared muscle synergies between two different arm motor tasks and can be utilized to assess motor disabilities in individuals with upper limb motor impairments." @default.
• W4384525245 created "2023-07-18" @default.
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• W4384525245 date "2023-07-17" @default.
• W4384525245 modified "2023-09-30" @default.
• W4384525245 title "Generalizability of muscle synergies in isometric force generation versus point-to-point reaching in the human upper extremity workspace" @default.
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• W4384525245 doi "https://doi.org/10.3389/fnhum.2023.1144860" @default.
• W4384525245 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37529403" @default.
• W4384525245 hasPublicationYear "2023" @default.
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