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Interindividual differences in H reflex modulation during normal walking.

Erik B Simonsen1, Poul Dyhre-Poulsen, Tine Alkjaer

  • 1Institute of Medical Anatomy, The Panum Institute, University of Copenhagen, Blegdamsvej 3C, 2200 Copenhagen N, Denmark. E.Simonsen@mai.ku.dk

Experimental Brain Research
|January 18, 2002
PubMed
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Human walking displays at least two motor patterns based on soleus Hoffmann (H) reflex modulation. These patterns involve different muscle activation and joint mechanics, influencing stability during gait.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Locomotion

Background:

  • Previous research suggests varied soleus Hoffmann (H) reflex modulation during walking.
  • Understanding these patterns is crucial for comprehending gait control and stability.

Purpose of the Study:

  • To identify distinct patterns of soleus H reflex modulation during human walking.
  • To investigate if different H reflex modulation patterns correlate with variations in walking mechanics and electromyographic (EMG) activity.

Main Methods:

  • Fifteen subjects walked at a controlled speed (4.5 km/h) over force platforms, with motion captured via video.
  • Soleus H reflex and EMG activity were recorded during treadmill walking.
  • Two-dimensional analysis calculated joint kinematics and kinetics; inverse dynamics determined joint moments.

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Main Results:

  • Two groups emerged: 'S' (suppressed H reflex during swing phase) and 'LS' (increasing H reflex excitability during swing phase).
  • Group LS exhibited greater ankle plantar flexor moments; Group S showed greater knee extensor moments.
  • Pre-heel strike EMG activity in vastus lateralis and tibialis anterior was higher in Group S.

Conclusions:

  • Human walking involves at least two distinct motor patterns, differentiated by afferent input gating, EMG, and mechanics.
  • Enhanced H reflex excitability during swing may offer protection via stretch reflexes.
  • Suppressed H reflex in swing may rely on knee extensors for stability around heel strike.