A preliminary study into rider asymmetry within equitation

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.