Abstract

The objective of this study was to examine the effects of muscle strength training on knee kinematics/kinetics and muscle activation patterns during anticipated side-step cutting. Three-dimensional knee kinematics/kinetics data and muscle activation of selected lower extremity muscles were measured while performing cutting before and after completing 10-week circuit strength training mixed typical resistance training and power training (intervention) or no training (control) from 25 female subjects. The muscle strength of quadriceps and hamstrings were measured before and after training using isokinetic dynamometer. No statistically significant differences were observed in quadriceps and hamstrings muscle strength, all kinematic/kinetic variables, and muscle activation for the control group. Both quadriceps (p = 0.005) and hamstrings (p = 0.030) muscle strength were increased after training. An increased biceps femoris (p = 0.003) and H:Q ratio of activation (p = 0.016), as well as decreased gastrocnemius muscle activation (p = 0.012) during pre-activation phase in intervention group were found. No significant differences were found in knee kinematics and kinetics both at the time frame of the initial contact and the peak tibial anterior shear force after training. In conclusion, muscle strength training altered some muscle activations of lower extremity muscles, which might affect the risk of ACL injury, but it did not change the kinematic/kinetic parameters.

摘要

这项研究的目的是检查预期的步伐切割过程中，肌肉力量训练对膝关节运动学/动力学和肌肉激活模式的影响。在完成10周回路力量训练之前和之后进行切割时，测量了25名女性的三维膝关节运动学/运动学数据以及选定下肢肌肉的肌肉激活情况，同时对25名女性进行了典型的阻力训练和力量训练（干预）或不训练（对照）科目。使用等速测功机在训练前后测量股四头肌和绳肌的肌肉强度。对照组的四头肌和绳肌的肌肉力量，所有运动/运动学变量和肌肉激活均未观察到统计学显着差异。两个四头肌（p 训练后，肌肉力量增加了 （= 0.005）和绳肌（p = 0.030）。 在干预组中，在激活前阶段，发现股二头肌增加（p  = 0.003）和H：Q激活比率（p  = 0.016），腓肠肌激活减少（p = 0.012）。初次接触的时间和训练后胫骨前剪切力峰值在膝关节运动学和动力学方面均未发现明显差异。总之，肌肉力量训练改变了下肢肌肉的某些肌肉激活，这可能会影响ACL损伤的风险，但并没有改变运动学/运动学参数。