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Keep your head down: Maintaining gait stability in challenging conditions.

Nicholas D A Thomas1, James D Gardiner2, Robin H Crompton2

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Young adults adapt well to lower visual field loss when walking on complex surfaces, primarily adjusting gaze rather than gait. Surface complexity significantly impacts walking behavior more than visual field restriction.

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Area of Science:

  • Human locomotion
  • Vision science
  • Biomechanics

Background:

  • Age-related peripheral vision loss impairs locomotion and increases fall risk.
  • Lower visual field loss specifically affects gaze and gait, exacerbating fall risk.
  • Walking on complex surfaces also alters gait and increases fall risk.

Purpose of the Study:

  • To investigate how lower visual field loss affects gaze and gait on varied complex surfaces.
  • To determine if lower visual field loss and surface complexity interact synergistically.

Main Methods:

  • Compared young participants' gaze and gait (head pitch, eye angle, muscle coactivation, gait speed, walking smoothness) with full vision versus simulated lower visual field loss.
  • Participants walked on diverse surfaces: pavements, grass, steps, and pebbles.

Main Results:

  • Surface complexity significantly altered head pitch, muscle coactivation, gait speed, and walking smoothness.
  • Lower visual field loss primarily affected head pitch angle, especially on complex surfaces.
  • No significant changes in muscle coactivation, gait speed, or walking smoothness were observed between full vision and lower visual field loss conditions.
  • Head pitch, muscle coactivation, gait speed, and walking smoothness were highly correlated.

Conclusions:

  • Young adults effectively compensate for lower visual field loss with minimal gait changes, mainly by adjusting gaze.
  • Surface complexity poses a greater challenge to gait than lower visual field loss.
  • Head pitch demonstrated a synergistic interaction with surface complexity when the lower visual field was blocked.
  • Future research should explore combined impairments representative of aging comorbidities.