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Function of sural nerve reflexes during human walking

E P Zehr1, R B Stein, T Komiyama

  • 1Division of Neuroscience, University of Alberta, Edmonton, Alberta, Canada T6G 2S2. pzehr@gpu.srv.ualberta.ca

The Journal of Physiology
|April 4, 1998
PubMed
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Cutaneous reflexes in human walking help stabilize gait by adjusting muscle activity and joint movements. These reflexes aid in adapting to uneven terrain during stance and avoiding obstacles during swing.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Locomotion

Background:

  • Ipsilateral cutaneous reflexes play a role in modulating motor output during locomotion.
  • Understanding these reflexes is crucial for comprehending gait stability and adaptation.

Purpose of the Study:

  • To investigate the functional roles of cutaneous reflexes during human walking.
  • To determine how stimulation intensity and phase of the step cycle influence reflex responses.

Main Methods:

  • Stimulation of the sural nerve with pseudorandom trains during walking.
  • Recording of electromyograms (EMG) from lower and upper leg muscles.
  • Measurement of ankle, knee, and hip joint kinematics.

Main Results:

Related Experiment Videos

  • Reflex responses varied with stimulation intensity and phase of the gait cycle.
  • During stance, reflexes assisted in adapting to uneven terrain and preventing injury from obstacles.
  • During swing, reflexes promoted dorsiflexion and knee flexion for obstacle avoidance.

Conclusions:

  • Cutaneous reflexes contribute to gait stabilization against external perturbations.
  • These reflexes play a significant role in adapting to uneven surfaces and avoiding obstacles during walking.