β-Oscillations Reflect Recovery of the Paretic Upper Limb in Subacute Stroke

Posted on 2020-04-24 - 12:09

Background. Recovery of upper limb function post-stroke can be partly predicted by initial motor function, but the mechanisms underpinning these improvements have yet to be determined. Here, we sought to identify neural correlates of post-stroke recovery using longitudinal magnetoencephalography (MEG) assessments in subacute stroke survivors. Methods. First-ever, subcortical ischemic stroke survivors with unilateral mild to moderate hand paresis were evaluated at 3, 5, and 12 weeks after stroke using a finger-lifting task in the MEG. Cortical activity patterns in the β-band (16-30 Hz) were compared with matched healthy controls. Results. All stroke survivors (n=22; 17 males) had improvements in action research arm test (ARAT) and Fugl-Meyer upper extremity (FM-UE) scores between 3 and 12 weeks. At 3 weeks post-stroke the peak amplitudes of the movement-related ipsilesional β-band event-related desynchronization (β-ERD) and synchronization (β-ERS) in primary motor cortex (M1) were significantly lower than the healthy controls (p<0.001) and were correlated with both the FM-UE and ARAT scores (r=0.51-0.69, p<0.017). The decreased β-ERS peak amplitudes were observed both in paretic and non-paretic hand movement particularly at 3 weeks post-stroke, suggesting a generalized disinhibition status. The peak amplitudes of ipsilesional β-ERS at week 3 post-stroke correlated with the FM-UE score at 12 weeks (r=0.54, p=0.03) but no longer significant when controlling for the FM-UE score at 3 weeks post-stroke.Conclusions. Although early β-band activity does not independently predict outcome at 3 months after stroke, it mirrors functional changes, giving a potential insight into the mechanisms underpinning recovery of motor function in subacute stroke.

CITE THIS COLLECTION

Tang, Chih-Wei; Hsiao, Fu-Jung; Lee, Po-Lei; Tsai, Yun-An; Hsu, Ya-Fang; Chen, Wei-Ta; et al. (2020): β-Oscillations Reflect Recovery of the Paretic Upper Limb in Subacute Stroke. SAGE Journals. Collection. https://doi.org/10.25384/SAGE.c.4951623.v1
or
Select your citation style and then place your mouse over the citation text to select it.

SHARE

email

Usage metrics

Neurorehabilitation and Neural Repair

AUTHORS (9)

Chih-Wei Tang
Fu-Jung Hsiao
Po-Lei Lee
Yun-An Tsai
Ya-Fang Hsu
Wei-Ta Chen
Yung-Yang Lin
Charlotte J. Stagg
I-Hui Lee
need help?