Objective.
To evaluate for any clinical effects of home-based mirror therapy and
subsequent cortical reorganization in patients with chronic stroke with
moderate upper extremity paresis.
Methods.
A total of 40 chronic
stroke patients (mean time post .onset, 3.9 years) were randomly
assigned to the mirror group (n = 20) or the control group (n = 20) and
then joined a 6-week training program. Both groups trained once a week
under supervision of a physiotherapist at the rehabilitation center and
practiced at home 1 hour daily, 5 times a week. The primary outcome
measure was the Fugl-Meyer motor assessment (FMA). The grip force,
spasticity, pain, dexterity, hand-use in daily life, and quality of life
at baseline—post treatment and at 6 months—were all measured by a
blinded assessor. Changes in neural activation patterns were assessed
with functional magnetic resonance imaging (fMRI) at baseline and
post treatment in an available subgroup (mirror, 12; control, 9).
Results.
Post treatment, the FMA improved more in the mirror than in the control group (3.6 ± 1.5, P < .05), but this improvement did not persist at follow-up. No changes were found on the other outcome measures (all Ps
>.05). fMRI results showed a shift in activation balance within the
primary motor cortex toward the affected hemisphere in the mirror group
only (weighted laterality index difference 0.40 ± 0.39, P < .05).
Conclusion.
This phase II trial showed some effectiveness for mirror therapy in
chronic stroke patients and is the first to associate mirror therapy
with cortical reorganization. Future research has to determine the
optimum practice intensity and duration for improvements to persist and
generalize to other functional domains.
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