Between Limb Muscle Co-activation Patterns in the Paretic Arm During Non-paretic Arm Tasks in Hemiparetic Cerebral Palsy.

Autor:	Hill NM; Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, United States.; Department of Biomedical Engineering, Northwestern University, Evanston, IL, United States., Sukal-Moulton T; Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, United States.; Department of Pediatrics, Northwestern University, Chicago, IL, United States., Dewald JPA; Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, United States.; Department of Biomedical Engineering, Northwestern University, Evanston, IL, United States.; Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, IL, United States.
Jazyk:	angličtina
Zdroj:	Frontiers in neuroscience [Front Neurosci] 2021 Jul 29; Vol. 15, pp. 666697. Date of Electronic Publication: 2021 Jul 29 (Print Publication: 2021).
DOI:	10.3389/fnins.2021.666697
Abstrakt:	Tasks of daily life require the independent use of the arms and hands. Individuals with hemiparetic cerebral palsy (HCP) often experience difficulty with fine motor tasks demonstrating mirrored movements between the arms. In this study, bilateral muscle activations were quantified during single arm isometric maximum efforts and submaximal reaching tasks. The magnitude and direction of mirrored activation was examined in 14 individuals with HCP and 9 age-matched controls. Participants generated maximum voluntary torques (MVTs) in five different directions and completed ballistic reaches while producing up to 80% of shoulder abduction MVT. Electromyography (EMG) signals were recorded from six upper extremity muscles bilaterally. Participants with HCP demonstrated more mirrored activation when volitionally contracting the non-paretic (NP) arm than the paretic arm ( F = 83.543, p < 0.001) in isometric efforts. Increased EMG activation during reach acceleration resulted in a larger increase in rest arm co-activation when reaching with the NP arm compared to the paretic arm in the HCP group ( t = 8.425, p < 0.001). Mirrored activation is more pronounced when driving the NP arm and scales with effort level. This directionality of mirroring is indicative of the use of ipsilaterally terminating projections of the corticospinal tract (CST) originating in the non-lesioned hemisphere. Peripheral measures of muscle activation provide insight into the descending pathways available for control of the upper extremity after early unilateral brain injury. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2021 Hill, Sukal-Moulton and Dewald.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu