Lisee Caroline, Birchmeier Thomas, Yan Arthur, Kuenze Christopher
Michigan State University, Department of Kinesiology, College of Education, East Lansing, MI, USA.
Michigan State University, Department of Kinesiology, College of Education, East Lansing, MI, USA.
Clin Biomech (Bristol). 2019 Dec;70:231-236. doi: 10.1016/j.clinbiomech.2019.10.012. Epub 2019 Oct 22.
It is unclear of how peak knee extension torque and early rate of torque development outcomes are related to lower extremity loading and sagittal plane movement in activities of daily living and landing tasks despite consistent deficits after anterior cruciate ligament reconstruction. The purpose of this cross-section study is to assess the ability of quadriceps strength characteristics to predict movement patterns during a step down and single leg drop crossover hopping tasks.
Fifty-two individuals with a unilateral history of anterior cruciate ligament reconstruction completed three trials of the step down and crossover hopping tasks on their involved limb. Participants completed three isometric knee extension contractions at 90° knee flexion with visual feedback to assess peak knee extension torque and rate of torque development during the first 0-100 ms and 100-200 ms of the contraction.
Peak knee extension torque explained the greatest variance in peak knee extension moment (R = 40.4%, p < 0.001) and knee flexion angle (R = 46.7%, p < 0.001) during the crossover hop landing. Rate of torque development (0-100 ms) was the only predictor of knee flexion angle (R = 19.8%, p = 0.01) at initial contact during the crossover hopping landing. Rate of torque development (100-200 ms) explained 17.6% of the variance in peak knee extension moment during the step down (p = .03).
Peak knee extension torque and early rate of torque development outcomes demonstrate limited relationships between movement of activities of daily living and sport-specific tasks. These limitations should be considered when interpreting the results of isometric strength testing in a clinical setting.
尽管前交叉韧带重建术后存在持续的功能缺陷，但目前尚不清楚在日常生活活动和落地任务中，膝关节伸展峰值扭矩和扭矩早期发展速率与下肢负荷及矢状面运动之间的关系。本横断面研究的目的是评估股四头肌力量特征预测下台阶和单腿交叉跳任务中运动模式的能力。
52名单侧有前交叉韧带重建病史的个体在其患侧肢体上完成了三次下台阶和交叉跳任务的试验。参与者在膝关节屈曲90°时完成三次等长膝关节伸展收缩，并通过视觉反馈评估收缩开始后0 - 100毫秒和100 - 200毫秒内的膝关节伸展峰值扭矩和扭矩发展速率。
在交叉跳落地过程中，膝关节伸展峰值扭矩解释了膝关节伸展峰值力矩（R = 40.4%，p < 0.001）和膝关节屈曲角度（R = 46.7%，p < 0.001）的最大方差。在交叉跳落地初始接触时，扭矩发展速率（0 - 100毫秒）是膝关节屈曲角度的唯一预测指标（R = 19.8%，p = 0.01）。在台阶下降过程中，扭矩发展速率（100 - 200毫秒）解释了膝关节伸展峰值力矩方差的17.6%（p = 0.03）。
膝关节伸展峰值扭矩和扭矩早期发展速率表明，其与日常生活活动和特定运动任务的运动之间关系有限。在临床环境中解释等长力量测试结果时，应考虑这些局限性。
