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Reflex Excitation of Muscles During Human Walking

  • Jens Bo Nielsen
  • Thomas Sinkjær
Chapter
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 508)

Abstract

Sensory activity may contribute to the control of human walking in two different ways. It may contribute to the pre-programmed drive to the motoneurones and to the reactions to unexpected external perturbations. Some recent findings in relation to these two different roles of sensory activity will be reviewed. When unloading the ankle plantarflexors in the stance phase of walking a drop in the soleus EMG activity is seen at a latency of around 60 ms. This drop is likely caused by the removal of the contribution of Gp II afferents from the ankle plantarflexors to the motoneuronal drive. When stretching plantarflexor muscles in the stance phase three reflex responses are generally observed. These responses may be caused by the spinal monosynaptic la reflex pathway, a spinal Gp II pathway and a transcortical reflex pathway, respectively. The reflex responses are modulated with the background EMG activity and may not be evoked in the swing phase when the plantarflexors are not active. In contrast, stretch of the ankle dorsiflexor muscles evoke relatively small responses in the swing phase when these muscles are active, but very large responses in the stance phase when the muscles are silent. Part of these responses may have a transcortical nature. These findings illustrate the complexity with which sensory input may contribute to the ongoing muscle activity during walking and may also mediate adequate responses to sudden external perturbations.

Keywords

Soleus Muscle Stance Phase Swing Phase Presynaptic Inhibition Human Walking 
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 2002

Authors and Affiliations

  • Jens Bo Nielsen
    • 1
  • Thomas Sinkjær
    • 2
  1. 1.Department of Medical PhysiologyUniversity of CopenhagenCopenhagen NDenmark
  2. 2.Center for Sensory-Motor InteractionUniversity of AalborgAalborgDenmark

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