Background: Although many of the movements of skiers are asymmetric, little is presently known about how such asymmetry influences performance. Here, our aim was to examine whether asymmetries in technique and the ground reaction forces associated with left and right turns influence the asymmetries in the performance of elite slalom skiers. Methods: As nine elite skiers completed a 20-gate slalom course, their three-dimensional full-body kinematics and ground reaction forces (GRF) were monitored with a global navigation satellite and inertial motion capture systems, in combination with pressure insoles. For multivariable regression models, 26 predictor skiing techniques and GRF variables and 8 predicted skiing performance variables were assessed, all of them determining asymmetries in terms of symmetry and Jaccard indices. Results: Asymmetries in instantaneous and sectional performance were found to have the largest predictor coefficients associated with asymmetries in shank angle and hip flexion of the outside leg. Asymmetry for turn radius had the largest predictor coefficients associated with asymmetries in shank angle and GRF on the entire outside foot. Conclusions: Although slalom skiers were found to move their bodies in a quite symmetrical fashion, asymmetry in their skiing technique and GRF influenced variables related to asymmetries in performance.

中文翻译：

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优秀高山滑雪运动员技术和地面反作用力的不对称性影响他们的激流回旋性能

背景：尽管滑雪者的许多动作是不对称的，但目前对于这种不对称如何影响性能的了解很少。在这里，我们的目的是检查技术上的不对称性以及与左右转弯相关的地面反作用力是否会影响精英激流回旋滑雪者的表现中的不对称性。方法：当九位精英滑雪者完成了20门激流回旋路线时，他们的三维全身运动学和地面反作用力（GRF）受到全球导航卫星和惯性运动捕获系统以及压力鞋垫的监控。对于多变量回归模型，评估了26种预测器滑雪技术和GRF变量以及8种预测的滑雪性能变量，所有这些变量都根据对称性和Jaccard指数确定了不对称性。结果：发现瞬时和截面表现的不对称性具有与胫骨小腿角度和髋部屈曲不对称性相关的最大预测系数。转弯半径的不对称具有与整个外脚上的刀柄角和GRF不对称相关的最大预测系数。结论：尽管发现激流回旋滑雪者以非常对称的方式移动身体，但滑雪技术和GRF的不对称性会影响与性能不对称性相关的变量。