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Related Experiment Videos

Soleus stretch reflex modulation during gait in humans

T Sinkjaer1, J B Andersen, B Larsen

  • 1Department of Medical Informatics and Image Analysis, Aalborg University, Denmark.

Journal of Neurophysiology
|August 1, 1996
PubMed
Summary

The short-latency stretch reflex in soleus muscles is modulated during walking. Its amplitude varies across the step cycle, being minimal during swing and increasing at heel contact, suggesting a role in muscle activation.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Physiology

Background:

  • The stretch reflex is a fundamental neural circuit controlling muscle activity.
  • Understanding reflex modulation during locomotion is crucial for analyzing human movement control.

Purpose of the Study:

  • To investigate the modulation of the short-latency stretch reflex during walking at various speeds.
  • To compare walking stretch reflexes with those during standing.

Main Methods:

  • Applied controlled ankle joint stretches using a motor-driven system during treadmill walking.
  • Measured soleus muscle electromyogram (EMG) and joint torque throughout the step cycle.
  • Analyzed reflex onset, peak latencies, and amplitude in relation to gait phase.

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Main Results:

  • Short-latency soleus stretch reflex amplitude varied significantly during the step cycle.
  • Reflex amplitude was similar to standing levels during stance, zero during swing-to-stance transition, and increased in late swing.
  • Reflex onset and peak latencies remained constant, irrespective of the gait phase.

Conclusions:

  • Constant reflex latencies suggest ankle extensor muscle spindles are consistently taut during walking.
  • The observed modulation, particularly the increased amplitude in late swing and at heel contact, indicates the stretch reflex contributes to ankle extensor activation in early stance.