Gender Comparisons and Associations between Lower Limb Muscle Activation Strategies and Resultant Knee Biomechanics during Single Leg Drop Landings

IF 1.4
Xiaohan Xu, Guojiong Hu, Genevieve K. R. Williams, Fenghao Ma
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引用次数: 1

Abstract

(1) Background: We aimed to compare gender differences in knee biomechanics and neuromuscular characteristics, and to determine the relationships between lower limb muscle pre-activations and knee biomechanics during a single leg drop landing, in order to identify riskier landing patterns to prevent injury and intervene properly. (2) Methods: Descriptive laboratory cross-sectional study on 38 healthy untrained subjects with low to moderate physical activity status. (3) Results: During the initial-contact phase of landing, females demonstrated greater peak vertical ground reaction force (GRF) normalized to body weight (49.12 ± 7.53 vs. 39.88 ± 5.69 N/kg; p < 0.001; Hedge’s g = 1.37), peak knee anterior reaction force normalized to body weight (0.23 ± 0.04 vs. 0.17 ± 0.05 N/kg; p < 0.001; Hedge’s g = 1.33), and decreased pre-activation of the semitendinosus (45.10 ± 20.05% vs. 34.03 ± 12.05%; p = 0.04; Hedge’s g = 0.67). The final regression equation was peak knee anterior reaction force = 0.024 + 0.025 (peak knee flexion moment) − 0.02 (semitendinosus-to-vastus lateralis pre-activation ratio) + 0.003 (peak vertical GRF) (R2 = 0.576, p < 0.001). (4) Conclusions: Overall, the data provided in this study support that a reduced semitendinosus-to-vastus lateralis pre-activation ratio predicted an increase in knee anterior reaction force and potentially an increase in ACL forces. Female non-athletes had gender-specific landing characteristics that may contribute to ACL injury. Future studies are warranted to consider more possible predictors of non-contact ACL injury.
单腿触地跌落过程中下肢肌肉激活策略与膝关节生物力学的性别比较及关联
(1) 背景:我们旨在比较膝关节生物力学和神经肌肉特征的性别差异,并确定单腿落地过程中下肢肌肉预激活和膝关节生物力学之间的关系,以确定风险更大的落地模式,防止受伤并进行适当干预。(2) 方法:对38名低至中等体力活动状态的未经训练的健康受试者进行描述性实验室横断面研究。(3) 结果:在着陆的初始接触阶段,雌性表现出更大的垂直地面反作用力峰值(49.12±7.53 vs.39.88±5.69 N/kg;p<0.001;Hedge's g=1.37),膝盖前反作用力峰值与体重标准化(0.23±0.04 vs.0.17±0.05 N/kg;p<0.001;Hedge'sg=1.33),半腱肌预激活降低(45.10±20.05%对34.03±12.05%;p=0.04;Hedge's g=0.67)。最终回归方程为峰值膝前反作用力=0.024+0.025(峰值膝屈曲力矩)-0.02(半腱肌与股外侧肌预激活率)+0.03(峰值垂直GRF)(R2=0.576,p<0.001)。(4)结论:总体而言,本研究中提供的数据支持,半腱肌与股外侧肌预激活率的降低预测了膝关节前反作用力的增加,并可能导致ACL力的增加。非运动员的女性具有特定性别的着地特征,这可能导致前交叉韧带损伤。未来的研究需要考虑更多非接触性ACL损伤的可能预测因素。
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