Evidence for normal intracortical inhibitory recruitment properties in cervical dystonia |
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Institution: | 1. Divisions of Physical Therapy and Rehabilitation Science, Department of Rehabilitation Medicine, School of Medicine, University of Minnesota, 426 Church St. SE, Minneapolis, MN 55455, USA;2. Department of Neurology, School of Medicine, University of Minnesota, 717 Delaware St. SE, Minneapolis, MN 55414, USA;3. Non-invasive Neuromodulation Laboratory, MnDRIVE Initiative, University of Minnesota, 247, 717 Delaware St. SE, Minneapolis, MN 55414, USA;4. School of Health and Rehabilitation Sciences, Department of Physical Therapy, Massachusetts General Hospital, Institute of Health Professions, 36 First Ave, Boston, MA 02129, USA |
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Abstract: | ObjectiveDystonia is associated with reduced intracortical inhibition as measured by the cortical silent period (cSP); however, this may be due to abnormal cSP threshold or input-output properties. This study evaluated cSP recruitment properties in people with cervical dystonia (CD).MethodsBilateral electromyographic recordings were collected in the upper trapezius muscle in response to transcranial magnetic stimulation of the left and right primary motor cortex in a group with CD (n = 19) and controls (n = 21). cSP threshold, cSP input-output properties at stimulation intensities from 1 to 1.4x the cSP threshold, ipsilateral silent period duration (iSP) and timing and magnitude of the contralateral and ipsilateral motor evoked potential (MEP) were assessed.ResultsThe cSP threshold, input-output properties, and contralateral MEP magnitude were not significantly different between groups (all p > 0.07). Hemispheric symmetry was present in the control group while the CD group had reduced iSP (p < 0.01) and a trend for reduced ipsilateral MEP response (p = 0.053) in the left hemisphere.ConclusionsRecruitment properties of intracortical inhibition are similar between control and CD groups. Transcallosal inhibition is asymmetric between hemispheres in people with CD.SignificanceEvidence of normal intracortical inhibition recruitment properties challenge the commonly held view that cortical inhibition is reduced in dystonia. |
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Keywords: | Dystonia Transcranial magnetic stimulation Cortical silent period Transcallosal inhibition Motor evoked potential Cortical excitability |
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