'Speculation' is useless for stroke survivors
Priming the motor system enhances the effects of upper limb therapy in chronic stroke
Priming the motor system enhances the effectsof upper limb therapy in chronic stroke Cathy M. Stinear, 1 P. Alan Barber,2James P Coon,Melanie K.Fleming1 and Winston D. Byblow11 Movement Neuroscience Laboratory, Department of Sport & Exercise Science,University of Auckland and 2 Department of Medicine,University of Auckland, Auckland, New ZealandCorrespondence to: Winston D. Byblow, Movement Neuroscience Laboratory, Department of Sport & Exercise Science,University of Auckland, Private Bag 92019, Auckland, New ZealandE-mail: w.byblow@auckland.ac.nz After stroke, the function of primary motor cortex (M1) between the hemispheres may become unbalanced.T-balancing of M excitability may prime the brain to be more responsive to reha-bilitation therapies and lead to improved functional outcomes. The present y examined the effects of Active^Passive Bilateral Therapy (APBT), a putative movement-based priming strategy designed to reduce intracortical inhibition and increase excitability within the ipsilesional M1.Thirty-two patients with upper limbweakness at least 6 months after stroke were randomized to a 1-month intervention of self-directed motor practice with their affected upper limb (control group) or to APBT for10^15min prior to the same motor practice APBT group). A blinded clinical rater assessed upper limb function at baseline, and immediately and 1 month after the intervention. Transcranial magnetic stimulation was used to assess M1 excitability. Immediately after the intervention, motor function of the affected upper limb improved in both groups( P 5 0.005). One month after the intervention, the APBT group had better upper limb motor function than control patients ( P 5 0.05).The APBT group had increasedipsilesional M1excitability ( P 5 0.025), increased transcal-losal inhibition from ipsilesional to contralesional M1 ( >P 5 within contralesional M1 (P5 0.005).None of these changes were found in the control group. APBT produced sustained improvements in upper limb motor function in chronic stroke patients and induced specific and sustainedchangesin motor cortex inhibitory function.We speculate that APBT may have facilitated plastic reorganizationin the brain in response to motor therapy. The utility of APBTas an adjuvant to physical therapy warrants further consideration.
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