The effect of ankle joint position and effort on quadriceps reflex sensitivity

  • Hwang I
  • Abraham L
  • Chou S
  • 29


    Mendeley users who have this article in their library.
  • 5


    Citations of this article.


Objective: To investigate a possible ankle-knee synergy, experiments with normal subjects were performed to compare changes of the quadriceps motor pool excitability due to ankle position and effort. Methods: Vastus medialis H reflex amplitude was examined during ankle isometric contractions conditioned by different ankle positions (dorsiflexion, neutral, and plantarfiexion) with or without voluntary effort (either in the dorsiflexion or plantarflexion direction). Repeated measures ANOVAs were performed on the mean and standard deviation of the H peak-to-peak amplitude. Results: Mean vastus medialis H reflex amplitudes were significantly different among the trials of different ankle efforts (P0.05). Conclusions: The data suggest that (1) the position of the ankle joint did not significantly modify the excitability of the neuromotor pool of the VM muscle, in either static or active cases, and (2) the effort effect from the ankle joint on the VM neuromotor pool is most significant during ankle plantarfiexion effort. Possible mechanisms are central motor irradiation and peripheral force-dependent pathways from the ankle joint that influence the VM neuromotor pool. Copyright (C) 2000 Elsevier Science Ireland Ltd.

Author-supplied keywords

  • Ankle position
  • Isometric ankle contraction
  • Motor pool excitability
  • Quadriceps H reflex
  • Synergy

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Ing Shiou Hwang

  • Lawrence D. Abraham

  • Shih Wei Chou

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free