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. 2019 Jan 4;9:1105. doi: 10.3389/fneur.2018.01105

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Copyright © 2019 Ding, Triggs, Kamath and Patten.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Short intracortical inhibition (SICI) across tasks and hemispheres. Data presented are group mean ±SEM. ^* indicates significant differences (P < 0.05). indicates differences approaching statistical significance (P < 0.1). No significant difference was revealed between IH and CH in stroke survivors. During grip and B and B, IH SICI was reduced compared with healthy controls (P = 0.094 during grip and 0.025 during B and B). Additionally, IH SICI was significantly reduced during B and B compared with rest (P = 0.028). In CH or healthy controls no difference in SICI was revealed across tasks. Of note, background EMG activity, S2 MEP size, and MEP/EMG were not significantly different between controls and Stroke IH during either grip or B and B, reducing likelihood that differences in motor excitability contribute to differences in SICI between controls and IH in stroke. CH, contralesional hemisphere; IH, ipsilesional hemisphere; B and B, box and blocks task; MEP, motor-evoked potential. MEP/EMG refers to the ratio of S2 (unconditioned) MEP size to mean prestimulus EMG activity.