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Abstract
Rider asymmetry is anecdotally associated with underperformance and injury. In this
study, rider axial rotation (AR) and shoulder angle displacement (SAD) were measured
using video analysis, and leg length inequality (LLI) was measured to assess any correlation
between LLI, AR and SAD. Two video cameras, recording transverse and sagittal views,
simultaneously filmed each of 17 female riders in walk, trot, and left and right canter.
The rider's shoulder angles relative to the cranial caudal line were measured at each
limb impact for a complete stride cycle. All riders exhibited left AR and a greater
range of movement (ROM) in the right shoulder in all gaits except right canter. LLI
(short right) was found in all riders but the LLI degree did not correlate with the
AR or ROM degree except in right canter, where a significant negative correlation
occurred. This method permits assessment of asymmetry, which could improve coaching
techniques and produce performance and welfare benefits.