Article

Mirror activity refers to
emergence of motion not only in the intended, but also in the contralateral limb.
PURPOSE: To characterize post-stroke mirror activities across multiple muscles
during unilateral pinch. METHODS: Chronic stroke survivors performed unilateral
pinch grip using the paretic and nonparetic hand, while four muscles' EMGs were
recorded for both hands. RESULTS: During the paretic hand grip, the relaxed
nonparetic hand showed mirror activity that was more pronounced for the intrinsic
(FDI and thenar eminence) than extrinsic muscles (FDS and EDC). During the
nonparetic hand grip, mirror activity in the paretic hand was suppressed for the
intrinsic than extrinsic muscles. CONCLUSION: Chronic stroke survivors' relaxed
hand did not mirror the task hand's muscle activation pattern, but displayed
altered muscle activation patterns depending on muscles and sides, possibly
mediated by disturbed interhemispheric inhibition and relative reliance on
corticospinal tracts among muscles. LEVEL OF EVIDENCE: N/A.
CI - Copyright (c) 2013 Hanley & Belfus. Published by Elsevier Inc. All rights
reserved.

Langue : ANGLAIS