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Spastic co-contraction is directly associated with altered cortical beta oscillations after stroke

Abstract : Objective: Spastic co-contraction is a motor-disabling form of muscle overactivity occurring after a stroke, contributing to a limitation in active movement and a certain level of motor impairment. The cortical mechanisms underlying spastic co-contraction remain to be more fully elucidated, the present study aimed to investigate the role of the cortical beta oscillations in spastic co-contraction after a stroke. Method: We recruited fifteen post-stroke participants and nine healthy controls. The participants were asked to perform active elbow extensions. In the study, multimodal analysis was performed to combine the evaluation of three-dimensional elbow kinematics, the elbow muscles electromyographic activations, and the cortical oscillatory activity. Results: The movement-related beta desynchronization was significantly decreased in post-stroke participants compared to healthy participants. We found a significant correlation between the movement-related beta desynchronization and the elbow flexors activation during the active elbow extension in post-stroke participants. When compared to healthy participants, post-stroke participants exhibited significant alterations in the elbow kinematics and greater muscle activation levels. Conclusions: Cortical beta oscillation alterations may reflect an important neural mechanism underlying spastic co-contraction after a stroke. Significance: Measuring the cortical oscillatory activity could be useful to further characterize neuromuscular plasticity induced by recovery or therapeutic interventions.
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Submitted on : Friday, May 14, 2021 - 2:28:30 PM
Last modification on : Wednesday, June 1, 2022 - 4:05:21 AM


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Alexandre Chalard, David Amarantini, Joseph Tisseyre, Philippe Marque, D. Gasq. Spastic co-contraction is directly associated with altered cortical beta oscillations after stroke. Clinical Neurophysiology, Elsevier, 2020, 131 (6), pp.1345 - 1353. ⟨10.1016/j.clinph.2020.02.023⟩. ⟨inserm-03223335v2⟩



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