Group I nonreciprocal inhibition in primary restless legs syndrome |
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Authors: | Cesa Scaglione MD PhD Roberto Vetrugno MD PhD Giuseppe Plazzi MD Giovanni Rizzo MD Federica Provini MD PhD Pasquale Montagna MD Paolo Martinelli MD |
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Institution: | Department of Neurological Sciences, University of Bologna, Bologna, Italy |
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Abstract: | Electrophysiological investigations of restless legs syndrome (RLS) have found spinal circuits impinging on motoneurones. We evaluated the H reflex threshold, latency, the Hmax/Mmax ratio, and the short latency autogenic inhibition in 7 patients with RLS and 10 age‐matched controls by testing the excitability changes in soleus H reflex Ib interneuron function. A significant reduction in Ib inhibition at 4 (P = 0.043), 5 (P = 0.007), and 6 ms (P = 0.001) of H reflex conditioning interstimulus interval was found in RLS patients. Data support the hypothesis that altered group I nonreciprocal inhibition is implicated in enhancing the spinal circuitry excitability of RLS, and are consistent with the view of an abnormal supraspinal drive to spinal interneurons in RLS. © 2007 Movement Disorder Society |
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Keywords: | restless legs syndrome spinal reflex Ib inhibition reticular formation nucleus reticularis giganto‐cellularis |
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