![]() ![]() ![]() Results suggest that the disruptions and re-organizations of neural circuitry after SCI are reflected by the extracted muscle synergies, but the question of how muscle synergies can guide rehabilitation interventions remains open. These limitations are associated with muscle weakness, a disturbance of the reflex activity, and the inability or difficulty to recruit muscles below the lesion. Neuromuscular constraints on muscle coordination during overground walking in persons with chronic incomplete spinal cord injury. A spinal cord injury (SCI) disrupts the communication within the nervous system, leading to limitations in sensorimotor activities, such as walking. Deviations from the average able-bodied synergies in subject with SCI were found to be poorly correlated (r = -0.04) with functional ability. We performed muscle synergy analysis using non-negative matrix factorization to identify muscle synergies from activation patterns of ten major leg muscles. The proportion of subjects in which particular synergies occurred was significantly different for subjects with SCI compared to able-bodied subjects (P < 0.001). The synergies most commonly observed in able-bodied subjects were co-activation of extensor digitorum communis and extensor indicis proprius, as well as of flexor digitorum superficialis with flexor carpi ulnaris. Functional performance in each task was quantified using a 5-point clinical scale. Interactions between interdependent systems produce emergent effects, such as resilience, that preclude single mechanism interpretations. Muscle synergies were extracted using non-negative matrix factorization. Surface electromyographic (EMG) data were recorded from 8 hand muscles in 10 able-bodied subjects and 6 subjects with SCI as they performed various functional tasks using grip types relevant to activities of daily living. We further sought to determine a correlation between functional ability and the extent of muscle synergy disruption. ![]() We examined whether changes in the motor control of the hand after SCI are manifested in the form of changes to muscle synergies. In order to guide and improve rehabilitation interventions for grip function after spinal cord injury (SCI), it is important to have a detailed understanding of the motor control strategies that the central nervous system uses to control the hand. ![]()
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