Presynaptic Control of Afferent Input During Real Locomotion in Rats

  • I. A. Yakhnitsa
  • A. L. Pilyavsky
  • N. V. Bulgokova


Studies were carried out on dorsal root potential (DRP) and dorsal root antidromic action potentials (AAPs) during two types of locomotion (swimming and stepping), which could be distinguished by the intensity of their afferent inputs (AI).

AAPs were taken to be an index to the level of depolarization of low-threshold afferent fibres and DRP, to that of high-threshold ones. During single swimming or stepping locomotor cycles, two DRP and AAP maxima, were found to be associated with the stance (or retraction) and swing phases. The values of AAPs and DRP and the intensity of AI during locomotion and passive hindlimb movements, respectively, were found to be clearly correlated. No dependence between intensity of depolarization of afferent fibres and efferent output was observed during real locomotion, contrary to what was observed during passive hindlimb movement.

It was concluded that DRP and AAPs during real locomotion are initiated mainly by influences from peripheral afferents.


Dorsal Root Tibialis Anterior Stance Phase Afferent Input Swing Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • I. A. Yakhnitsa
    • 1
  • A. L. Pilyavsky
    • 1
  • N. V. Bulgokova
    • 1
  1. 1.A.A. Bogomoletz Institue of PhysiologyAcademy of Sciences of the Ukrainian SSRKievRussia

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