The relationship between the soleus H-reflex amplitude and vibratory inhibition in controls and spastic subjects: I. Experimental results

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

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

The effect of continuous Achills tendon vibration on the soleus H-reflex amplitude was quantified over the entire H-reflex recruitment trajectory in 30 controls and 33 patients with spasticity in the lower limbs. The results show that with increasing stimulus intensities, vibratory inhibition of the H-reflex initially increases, then subsequently decreases. This is probably a direct consequence of how the activation thresholds of the motoneurons are distributed over the motoneuron pool. In patients, vibratory inhibition of the H-reflex was less over the entire recruitment trajectory than in controls. The decrease in to a decrease in vibratory inhibition in spasticity is commonly attributed presynaptic inhibition or post-activation depression. However, the average H-reflex threshold was lower in the patients, suggesting a decrease of the motoneuron activation thresholds. A lower reflex threshold in spasticity, therefore, may contribute to the observed reduction of vibratory inhibition.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalJournal of electromyography and kinesiology
Volume6
Issue number4
DOIs
Publication statusPublished - 1 Dec 1996
Externally publishedYes

Keywords

  • Soleus H-reflexd recruitment
  • Spasticity
  • Vibratory inhibition

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