8周FIFA 11+训练对伴有动态膝外翻的青春期女足运动员功能性疲劳后落地错误评分系统的影响
简介
一项针对存在动态膝外翻的青少年女足运动员的随机对照试验发现，8周FIFA 11+训练能显著改善其落地错误评分系统（LESS）评分，尤其在功能性疲劳状态下，干预组评分下降34.2%，而对照组上升3.1%。该结果表明，FIFA 11+有助于维持疲劳高风险状态下的落地力学，可能对降低ACL损伤风险有积极意义，但样本量较小且针对特定人群。
英文摘要
BACKGROUND: Adolescent female soccer players exhibit a disproportionately high risk of non-contact anterior cruciate ligament (ACL) injuries, with dynamic knee valgus (DKV) representing one of the major modifiable biomechanical risk factors, particularly under conditions of functional fatigue. The FIFA 11+ injury prevention program has demonstrated efficacy in reducing lower extremity injury risk, yet its impact on landing mechanics under fatigued conditions in this population remains underexplored. This study aimed to investigate the effects of an 8-week FIFA 11+ program on Landing Error Scoring System (LESS) scores following a functional fatigue protocol in adolescent female soccer players with DKV. METHODS: This parallel-group randomized controlled trial included 21 adolescent female soccer players (aged 13-17 years) exhibiting DKV, allocated to an intervention group (n = 11) receiving the FIFA 11+ program or a control group (n = 10) maintaining standard warm-up routines. LESS assessments were conducted before and after a validated youth soccer fatigue simulation protocol (YoSFS⁵) at baseline and after 8 weeks. A 2 × 2 × 2 mixed-design ANOVA examined the effects of group, time, and fatigue on LESS scores. RESULTS: Significant main effects were observed for time (F1,19= 4.90,p = 0.039, partial η² = 0.205) and fatigue (F1,19= 73.49, p < 0.001, partial η² = 0.795). Critically, significant interactions emerged for time × group (F1,19= 13.51,p = 0.002, partial η² = 0.416), time × fatigue (F1,19= 15.95,p < 0.001, partial η² = 0.456), and time × fatigue × group (F1,19= 4.62, p = 0.045, partial η² = 0.196). The intervention group demonstrated substantial reductions in LESS scores post-intervention, particularly under fatigued conditions (-34.2% vs. +3.1% in controls). CONCLUSION: The 8-week FIFA 11+ program significantly improved landing mechanics and attenuated fatigue-induced deteriorations in adolescent female soccer players with DKV. These findings highlight the program's potential to improve the maintenance of landing mechanics during high-risk fatigued states, with potential implications for improving biomechanical factors associated with ACL injury risk during fatigue. TRIAL REGISTRATION: Iranian Registry of Clinical Trials (IRCT), IRCT20250818066901N1, registered 24/09/2025.