身心联合疲劳对高水平男性足球运动员非预期侧切变向时膝关节多平面生物力学的影响：一项随机交叉试验
简介
该研究通过随机交叉试验，在高度训练的男性足球运动员中评估了身心联合疲劳（PMF）对非预期侧切动作时膝关节生物力学的影响。结果显示，PMF显著增加了落地初始接触时的膝外翻角度、峰值膝外翻力矩、垂直地面反作用力及加载率，同时减少了膝屈曲角度和负重期时长。这些发现提示，在评估高认知负荷运动任务中的生物力学反应时，需同时考虑身体和认知疲劳的叠加效应，对理解ACL损伤…
英文摘要
OBJECTIVES: To investigate the effects of combined physical and mental fatigue (PMF) on knee biomechanics during unanticipated sidestep cutting in male soccer players. DESIGN: Randomized crossover trial. SETTING: Biomechanics laboratory. MAIN OUTCOME MEASURES: knee angles at initial contact (IC), range of motion (ROM), peak knee moments, three-dimensional ground reaction force (GRF), weight acceptance (WA) duration, and loading rate (LR) during the WA phase. RESULTS: Significant fatigue condition × time interactions were observed for knee flexion (p < 0.001) and abduction angle at IC (p < 0.001), WA duration (p = 0.003), peak knee abduction moment (p < 0.001), peak vertical GRF (p = 0.014), and LR (p = 0.016). Post hoc analyses showed that PMF increased knee abduction angle at IC (p < 0.001), peak knee abduction moment (p < 0.001), peak vertical GRF (p = 0.012), and LR (p = 0.006), while decreasing knee flexion angle at IC (p < 0.001) and WA duration (p < 0.001). CONCLUSIONS: PMF resulted in greater alterations in knee biomechanics during unanticipated sidestep cutting compared with isolated fatigue states. These findings suggest that the combined effects of physical and cognitive fatigue should be considered when evaluating biomechanical responses during cognitively demanding motor tasks.