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Presynaptic inhibition compared with homosynaptic depression as an explanation for soleus H-reflex depression in humans.

Authors
  • Kohn, A F
  • Floeter, M K
  • Hallett, M
Type
Published Article
Journal
Experimental brain research
Publication Date
Sep 01, 1997
Volume
116
Issue
2
Pages
375–380
Identifiers
PMID: 9348136
Source
Medline
License
Unknown

Abstract

The H-reflex is depressed for seconds if elicited following a single H-reflex or train of H-reflexes. Presynaptic inhibition from flexor afferents (tibialis anterior) onto soleus Ia afferents elicited by either single or trains of stimuli had no effect on the soleus H-reflex on a time scale of seconds. Postsynaptic inhibition was also excluded by magnetic stimulation tests that showed that the excitability of the motoneuron pool was not changed at latencies within a range of seconds. Homosynaptic depression localized at the presynaptic terminal seems to be the mechanism behind the H-reflex depression in humans.

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