Post-activation depression of the soleus H-reflex in stroke patients

Yoshihisa Masakado, Y. Kagamihara, O. Takahashi, K. Akaboshi, Y. Muraoka, J. Ushiba

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Purpose: We examined post-activation depression in 35 stroke patients and 10 healthy subjects, and investigated whether their clinical symptoms were correlated to post-activation depression. Methods: Post-activation depression of the soleus H-reflex evoked by electrical stimulation of the common peroneal nerve with supramaximal intensity of motor response on the tibialis anterior muscle. Results: Post-activation depression was decreased on the affected side of the stroke patients. There was a significant difference between the affected and unaffected sides of the patients with post-activation depression, but no difference between the unaffected sides of the patients and healthy subjects. The presence of ankle clonus and the decrease in post-activation depression were correlated. Conclusion: Decreased post-activation depression in stroke patients suggests that a mechanism other than postsynaptic inhibition, such as reciprocal Ia inhibition and Ib inhibition, and presynaptic inhibition, may contribute to the exaggerated stretch reflexes, in particular, the manifestation of clonus.

Original languageEnglish
Pages (from-to)115-122
Number of pages8
JournalElectromyography and Clinical Neurophysiology
Issue number2
Publication statusPublished - 2005 Mar


  • Clonus
  • H reflex
  • Post-activation depression
  • Soleus muscle
  • Stroke

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Physiology (medical)


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