title: Crossed spinal soleus muscle communication demonstrated by H-reflex conditioning.
abstract: BACKGROUND
  A conditioning volley to the ipsilateral tibial nerve (iTN) inhibits contralateral soleus (cSOL) electromyographic activity at latencies of 37-41 ms. This is evidence for spinal muscular communication in opposing limbs. The aim of our study was to determine whether the cSOL H-reflex would be inhibited in a similar manner.
  
  
  METHODS
  Thirteen subjects participated in two experiments: (1) stimuli delivered to the iTN at 85% of the maximal peak-to-peak M-wave (85% M-max) with a pre-contracted cSOL; (2) 510 stimuli delivered at 85% M-max to the iTN with a test volley delivered to the contralateral tibial nerve at interstimulus intervals of -6 to 100 ms.
  
  
  RESULTS
  Significant inhibition was observed in the cSOL H-reflex when conditioning stimuli were delivered 3-33 ms before the test H-reflex.
  
  
  CONCLUSIONS
  The activity of this spinal pathway can be quantified using H-reflex conditioning to provide a controlled model for further studies of this response.
authors: Hammel Neurorehabilitation Hospital and Research Center, Aarhus University, Hammel, Denmark.
authors: Peter W
authors: PW
authors: Stubbs
authors: Jørgen F
authors: JF
authors: Nielsen
authors: Thomas
authors: T
authors: Sinkjaer
authors: Natalie
authors: N
authors: Mrachacz-Kersting