Abstract:
:In cat medial gastrocnemius motoneurons, single stimuli to the cutaneous sural nerve evoke a post-synaptic potential with a mixture of depolarization and hyperpolarization, depolarization being dominant in type F cells and hyperpolarization in type S cells. This pattern is consistent with previous reports showing that activation of the sural nerve can sometimes reverse the normal order of motor unit recruitment by inhibiting S motor units while simultaneously exciting F motor units. However, during repetitive stimulation for 1-2 s, we found that the hyperpolarizing component of the sural input to medial gastrocnemius motoneurons was not persistent, but instead gave way to depolarization after the first 30 ms. The net steady-state response after 0.5-1.0 s of stimulation was depolarization in all cells, regardless of motor unit type. This suggests that tonic sural input may be incapable of producing prolonged recruitment reversals.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Heckman CJ,Miller JF,Munson M,Rymer WZdoi
10.1007/BF00230025keywords:
subject
Has Abstractpub_date
1992-01-01 00:00:00pages
167-70issue
1eissn
0014-4819issn
1432-1106journal_volume
91pub_type
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