Symes Debbie, Ellis Robert
University Campus Suffolk, Ipswich, Suffolk IP4 1LZ, UK.
Vet J. 2009 Jul;181(1):34-7. doi: 10.1016/j.tvjl.2009.03.016. Epub 2009 Apr 16.
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.
骑手不对称现象在坊间被认为与表现不佳和受伤有关。在本研究中，通过视频分析测量骑手的轴向旋转（AR）和肩角位移（SAD），并测量腿长不等（LLI），以评估LLI、AR和SAD之间的相关性。两台摄像机，分别记录横向和矢状面视图，同时拍摄了17名女性骑手在慢步、快步以及左右跑步时的情况。在一个完整的步幅周期内，测量每次肢体着地时骑手肩部相对于颅尾线的角度。除了右跑步外，所有骑手在所有步态中均表现出向左的AR以及右肩更大的运动范围（ROM）。所有骑手均存在LLI（右侧短），但LLI程度与AR或ROM程度无关，除了在右跑步时出现了显著的负相关。这种方法允许对不对称性进行评估，这可能会改进训练技术并产生提高表现和福利的益处。
