School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.
Sports Performance and Technology Laboratory, University of São Paulo, São Paulo, Brazil.
J Sports Sci. 2024 Jun;42(12):1120-1129. doi: 10.1080/02640414.2024.2386206. Epub 2024 Aug 2.
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 < 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.
在理解侧向跨步切割过程中肌肉疲劳的影响时，加载内外侧间室都很重要。本研究调查了在手球特定疲劳方案后，侧向跨步切割动作中，胫股接触力在内侧和外侧间室的变化以及肌肉力的贡献。20 名女性手球运动员在疲劳方案前（基线）和后进行了三次侧向跨步切割动作测试。运动捕捉和地面反作用力被测量，数据在 OpenSim 中进行处理。使用统计参数映射（SPM）比较变量，显著性水平为 < 0.05。结果表明，在早期站立阶段疲劳时，膝关节屈曲角度减小。此外，疲劳后分析显示，股四头肌的力量明显减小。同样，在疲劳期间，SPM 分析显示，垂直和前向的胫股接触力减小。疲劳后，内外侧髁的垂直力均显著减小。这些结果表明，与基线值相比，疲劳后施加在胫股关节上的力减小。然而，没有一致的证据表明疲劳会增加膝关节受伤的风险。
