Abstract：
Loading both lateral and medial compartments is crucial to understanding the effect of muscle fatigue during sidestep cutting. The present study investigated the changes in tibiofemoral contact forces in the medial and lateral compartments and the muscle force contributions during the sidestep-cutting manoeuvre after a handball-specific fatigue protocol. Twenty female handball athletes performed three trials of the sidestep-cutting manoeuvre before (baseline) and after the fatigue protocol. Motion capture and ground reaction forces were measured, and the data were processed in OpenSim. The variables were compared using statistical parametric mapping (SPM), with a significance level of p < 0.05. The results showed a decreased knee flexion angle during fatigue in the early stance phase. In addition, the post-fatigue analysis demonstrated significantly reduced forces in vasti muscles. Similarly, during fatigue, the SPM analysis showed decreased tibiofemoral contact forces in the vertical and anterior directions. Vertical force applied to both medial and lateral condyles demonstrated a significant reduction after the fatigue protocol. These results indicated that forces applied to the tibiofemoral joint were reduced following the fatigue protocol compared to the baseline values. However, no consistent evidence exists that fatigue increases the risk of knee injuries.
摘要：
加载外侧和内侧隔室对于了解侧切过程中肌肉疲劳的影响至关重要。本研究调查了特定于手球的疲劳方案后，在切边动作过程中，内侧和外侧隔室的胫骨接触力的变化以及肌肉力量的贡献。二十名女手球运动员在疲劳方案之前（基线）和之后进行了三次切边动作试验。测量了运动捕获力和地面反作用力，并在OpenSim中处理数据。使用统计参数映射(SPM)比较变量，显著性水平为p<0.05。结果表明，在早期站立阶段疲劳期间，膝关节屈曲角度减小。此外,疲劳后分析显示肌肉力量显著降低.同样，在疲劳期间，SPM分析显示，在垂直和向前方向上，胫骨股接触力降低。疲劳方案后，施加到内侧和外侧髁的垂直力显示出显着降低。这些结果表明,与基线值相比,在疲劳方案之后施加到胫股关节的力减小。然而,没有一致的证据表明疲劳会增加膝关节损伤的风险.
