Soleus H-reflex tests and clinical signs of the upper motor neuron syndrome

J.H.T.M. Koelman, L.J. Bour, A.A.J. Hilgevoord, G.J. van Bruggen, B.W. Ongerboer de Visser*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Soleus H-reflex tests are used for elucidating pathophysiological mechanisms in motor control. The cumulative vibratory inhibition of the soleus H-reflex, the ratio of the reflex to direct muscle potential (H to M ratio) and the recovery curve of the soleus H-reflex were studied in 38 patients with varying signs of the upper motor neuron syndrome for a possible relation with clinical features. The results were compared with those obtained from a group of healthy volunteers. The magnitude of vibratory inhibition decreased with increase of hypertonia. The H to M ratio increased as the activity of the tendon reflex was enhanced and correlated to a lesser degree with muscle tone. Both the H to M ratio and late facilitation of the soleus H-reflex recovery curve were elevated in clonus. The findings suggest that alterations in the results of soleus H-reflex tests relate to specific clinical features of the upper motor neuron syndrome. Possible pathophysiological implications are discussed.

Original languageEnglish
Pages (from-to)776-781
Number of pages6
JournalJournal of neurology, neurosurgery and psychiatry
Issue number7
Publication statusPublished - 1 Jan 1993
Externally publishedYes

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