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Experimental Brain Research

, Volume 116, Issue 2, pp 375–380 | Cite as

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

  • A. F. Kohn
  • Mary Kay Floeter
  • Mark Hallett
RESEARCH NOTE

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.

Key words H-reflex depression Homosynaptic depression Presynaptic inhibition Spinal cord Human 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • A. F. Kohn
    • 1
  • Mary Kay Floeter
    • 1
  • Mark Hallett
    • 1
  1. 1.National Institutes of Health, NINDS, Human Motor Control Section, USA Fax: +1-302-402-1007US

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