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Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
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Carrying asymmetric loads while walking on an uneven surface.

Junsig Wang1, Jason C Gillette2

  • 1Department of Orthopaedic Surgery, University of Arizona, Tucson, AZ, USA.

Gait & Posture
|December 19, 2018
PubMed
Summary

Carrying loads unevenly or walking on uneven surfaces significantly challenges postural stability. Unilateral loads and uneven terrain demand greater control, especially during single-leg stance.

Keywords:
Asymmetric loadCenter of pressureGaitTime-to-contactUneven surface

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Area of Science:

  • Biomechanics
  • Human movement science
  • Postural control

Background:

  • Asymmetric loading and uneven terrain increase postural control demands.
  • Understanding these challenges is crucial for preventing falls and injuries.

Purpose of the Study:

  • To investigate postural stability (medial-lateral direction) during walking with unilateral vs. bilateral loads on even vs. uneven surfaces.

Main Methods:

  • 19 healthy adults walked on even/uneven treadmills with no load, 20% body weight (BW) bilateral load, or 20% BW unilateral load.
  • Center of pressure (COP) parameters were measured using an in-shoe pressure system.

Main Results:

  • Both bilateral and unilateral loads increased double support ratio.
  • Unilateral loads amplified double support ratio variability, medial-lateral COP excursion variability, and medial-lateral COP velocity variability.
  • Uneven surfaces increased double support ratio, medial-lateral COP excursion, medial-lateral COP velocity, and double support ratio variability.
  • During unilateral loading, the stance phase on the unloaded leg showed increased double support ratio and medial-lateral COP velocity.

Conclusions:

  • Unilateral load carriage and walking on uneven surfaces significantly impair postural stability.
  • The findings highlight the importance of considering these factors in activities requiring balance and mobility.