![]() ![]() 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. Deviations from the average able-bodied synergies in subject with SCI were found to be poorly correlated (r = -0.04) with functional ability. Muscle synergy analysis is a tool for identifying common sources of activity from recordings of multiple 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. Changes in the number of muscle synergies (MSs) and in the weighting of muscles composing each MS are typically altered following an incomplete spinal cord injury (iSCI). Functional performance in each task was quantified using a 5-point clinical scale. 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. Activating the isolated lumbar circuits to restore some level of stepping in severe spinal cord injury recruits all of these systems. ![]() ![]() We further sought to determine a correlation between functional ability and the extent of muscle synergy disruption. Linking muscle synergy to biomechanics - unit bursts as force-field primitives. Background: After incomplete spinal cord injury (iSCI), patients suffer important sensorimotor impairments, such as abnormal locomotion patterns and spasticity. We examined whether changes in the motor control of the hand after SCI are manifested in the form of changes to muscle synergies. This study examines muscle synergies derived from simple standing studies of a complete spinal cord injury (SCI) patient under epidural spinal stimulation. 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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