![]() ![]() We think these muscle-synergy patterns can be used as physiological markers of the status of any patient with stroke or trauma, thereby guiding the development of different rehabilitation approaches, as well as future physiological experiments for a further understanding of postinjury mechanisms of motor control and recovery. These patterns varied as a function of both the severity of functional impairment and the temporal distance from stroke onset. When its balanced directly over an erect spine, it takes much less work for your neck and back muscles to support it. Our factorization analysis revealed, in a quantitative way, three distinct patterns of muscle coordination-including preservation, merging, and fractionation of muscle synergies-that reflect the multiple neural responses that occur after cortical damage. Abstract Background/objectives: 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. Existing reviews on the subject of motor synergy following spinal cord injury also use the stroke framework due to the sparsity of information regarding spainal cord injury. We used a factorization algorithm to identify the muscle synergies. ![]() ![]() To gain insights into this complex process, we recorded myoelectric signals from multiple upper-limb muscles in subjects with cortical lesions. Damage to the motor cortical areas disrupts the orchestration of the modules, resulting in abnormal movements. A ventral root consists of the axons of those motor neurons that have their bodies in the ventral (or anterior) grey horns of the spinal cord. These spinal modules subserve normal motor behaviors by activating groups of muscles as individual units (muscle synergies). Cortical damage, whether by trauma or stroke, interferes with the flow of descending signals to the modular interneuronal structures of the spinal cord. The experimental findings herein reported are aimed at gaining a perspective on the complex neural events that follow lesions of the motor cortical areas. Changes in hand muscle synergies in subjects with spinal cord injury: Characterization and functional implications José Zariffa, John Steeves & Dinesh K. ![]()
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