The aim of this study was to explore how riders attenuate accelerations in sitting trot between their trunk and pelvis using IMUs. Fifteen female adult riders and their own horses were captured in sitting trot using IMUs affixed the rider`s trunk (approx. T12), and sacrum, and the horse`s girth. Horse-pelvis and trunk-pelvis attenuation were calculated from the resultant acceleration in the frequency domain. The root mean square of the horse`s acceleration per stride was averaged for the trial. Sensor fusion was performed to elicit rider pelvis and trunk pitch. Significant (pr2=-0.52) attenuation and trunk-pelvis attenuation and horse acceleration (r2=-0.58). Riders attenuate the horse`s accelerations between trunk and pelvis, scaling to horse acceleration, calling for further investigation of contributing factors.
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