It is generally accepted that neuromuscular overload and fatigue of one lower limb can affect the functional ability of the ipsilateral limb, and possibly the contralateral limb, increasing the likelihood of injury. The purpose of the current study was to examine the effect of a unilateral countermovement vertical jump (UCVJ) fatigue protocol on the neuromuscular function of the ipsilateral as well as the contralateral lower limb. The isometric strength of the hip stabilizers, postural control via posturographic analysis during the Y-Balance-Test (YBT), and the stance-phase-of-gait were assessed in 24 healthy physical active males and females before and after execution of a UCVJ fatigue protocol. The fatigue protocol included 5 sets of 20 maximum UCVJs performed on the supportive leg, with a 30-s break between sets. Following a 16.8% decline in vertical jump performance and an associated 2.3-fold increase in perceived exertion, our findings revealed significant post-fatigue inter-limb differences regarding postural control. The post-fatigue inter-limb differences regarding the isometric strength of the hip stabilizers and the stance-phase-of-gait parameters were not significant. Our findings showed that a 100 UCVJs session is likely to induce significant inter-limb differences in postural control, possibly increasing the risk of lower limb injury.

中文翻译：

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单边反向运动垂直跳跃协议后，疲劳引起的髋部稳定器强度、姿势控制和步态的四肢不对称

人们普遍认为，一侧下肢的神经肌肉超负荷和疲劳会影响同侧肢体的功能能力，也可能影响对侧肢体的功能能力，从而增加受伤的可能性。本研究的目的是检查单侧反向运动垂直跳跃（UCVJ）疲劳方案对同侧以及对侧下肢神经肌肉功能的影响。在执行 UCVJ 之前和之后，对 24 名健康体力活跃的男性和女性评估了髋部稳定器的等长强度、Y 平衡测试 (YBT) 期间通过姿势图分析进行的姿势控制以及步态的站立阶段疲劳协议。疲劳方案包括在支撑腿上进行 5 组，每组 20 次最大 UCVJ，组间休息 30 秒。在垂直跳跃表现下降 16.8% 以及相关的感知用力增加 2.3 倍之后，我们的研究结果揭示了疲劳后肢体间在姿势控制方面的显着差异。疲劳后关于髋部稳定器的等长力量和步态站立阶段参数的四肢间差异并不显着。我们的研究结果表明，100 次 UCVJ 训练可能会导致肢体间在姿势控制方面存在显着差异，从而可能增加下肢受伤的风险。