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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.

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Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
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Published on: January 15, 2016

A preliminary study into rider asymmetry within equitation.

Debbie Symes1, Robert Ellis

  • 1University Campus Suffolk, Ipswich, Suffolk IP4 1LZ, UK. debbie@earlsway.orangehome.co.uk

Veterinary Journal (London, England : 1997)
|April 21, 2009
PubMed
Summary

Rider asymmetry, including axial rotation and shoulder angle displacement, was studied in 17 female riders. Leg length inequality was present but weakly correlated with asymmetry, suggesting other factors influence rider performance and welfare.

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Area of Science:

  • Equine Science
  • Biomechanics
  • Sports Medicine

Background:

  • Rider asymmetry is anecdotally linked to decreased performance and increased injury risk in equestrian sports.
  • Objective measurement of rider asymmetry is crucial for understanding its impact.

Purpose of the Study:

  • To investigate the correlation between leg length inequality (LLI) and rider asymmetry, specifically axial rotation (AR) and shoulder angle displacement (SAD).
  • To establish a quantifiable method for assessing rider asymmetry to improve coaching and welfare.

Main Methods:

  • 17 female riders were filmed using two video cameras (transverse and sagittal views) across multiple gaits (walk, trot, canter).
  • Rider axial rotation (AR) and shoulder angle displacement (SAD) were measured using video analysis.
  • Leg length inequality (LLI) was measured to assess its relationship with AR and SAD.

Main Results:

  • All riders exhibited leftward axial rotation (AR) and greater range of motion (ROM) in the right shoulder, except during right canter.
  • Leg length inequality (short right leg) was present in all riders.
  • LLI degree showed no significant correlation with AR or ROM, except for a negative correlation during right canter.

Conclusions:

  • The study quantifies rider asymmetry, identifying consistent patterns of AR and SAD.
  • While LLI is prevalent, it is not the sole determinant of rider asymmetry.
  • The developed video analysis method offers a valuable tool for assessing asymmetry, potentially enhancing coaching strategies and improving horse and rider welfare.