Abstract：
This study aimed to investigate posterior chain muscle function and the influence of pointe shoes in ballet dancers with and without low back pain (LBP) in the Arabesque. Twenty-nine young professional ballet dancers (17 with LBP and 12 healthy controls) were recruited. Muscle strength and mechanical properties of the erector spinae and hamstrings were assessed. The displacement of centre of mass (COM) during Arabesque under different shoe conditions (R-class, Chacott, and own shoes) was measured with a motion capture system. The LBP group exhibited greater dynamic stiffness and decreased mechanical stress relaxation time in the lateral hamstring compared to the control group. During Arabesque, the LBP group demonstrated significantly greater anterior-posterior displacement of the COM and a larger percentage of time to achieve maximal trunk extension angle. The COM displacement in vertical and medial-lateral directions was smaller in the R-class than in their own shoes. LBP impacts muscle mechanical properties, particularly in the lateral hamstring. The compromised muscle function resulted in a longer time to spinal extension during Arabesque, signifying that reduced trunk control contributed to greater COM displacement. Hence, it is essential to emphasise that evaluating muscle properties and dynamic postural control is imperative for dancers experiencing LBP.
摘要：
这项研究旨在研究后链肌肉功能以及足尖鞋对阿拉伯式芭蕾舞演员有无腰背痛（LBP）的影响。招募了29名年轻的专业芭蕾舞演员（17名患有LBP和12名健康对照）。评估了竖脊肌和腿筋的肌肉强度和机械性能。在不同的鞋子条件下（R级，Chacott,和自己的鞋子）用动作捕捉系统测量。与对照组相比，LBP组表现出更大的动态刚度，并减少了外侧腿筋的机械应力松弛时间。在阿拉伯时期，LBP组显示COM前后位移明显更大,达到最大躯干伸展角的时间百分比更大.R级的垂直和内侧-外侧方向的COM位移比他们自己的鞋子小。LBP影响肌肉机械特性，尤其是外侧腿筋。Arabesque期间受损的肌肉功能导致脊柱延伸的时间更长，这表明躯干控制的减少导致了更大的COM位移。因此，必须强调的是，评估肌肉特性和动态姿势控制对于经历LBP的舞者至关重要。
