Increasing running step rate reduces patellofemoral joint forces.
Increasing running step rate reduces patellofemoral joint forces.
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DOI：
10.1249/mss.0b013e3182a78c3a
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发表时间：
2014-03
影响因子：
4.1
通讯作者：
Heiderscheit BC
中科院分区：
文献类型：
--
作者：
Lenhart RL;Thelen DG;Wille CM;Chumanov ES;Heiderscheit BC
增加步频已被证明会引起跑步过程中关节运动学和动力学的变化，并已被建议作为髌股关节疼痛跑步者的可能康复策略。本研究的目的是确定改变步速如何影响内部肌肉力量和髌股关节负荷，然后确定哪些运动学和动力学因素最能预测关节负荷的变化。我们记录了30名健康成年人在三种步速条件下（90%，100%和110%的首选步速）在仪器跑步机上跑步的全身运动学。然后，我们使用3D下肢肌肉骨骼模型来估计整个跑步步态周期中的肌肉、髌腱和髌股关节力。此外，线性回归分析使我们能够确定肢体姿势和外部载荷对髌股关节力的相对影响。将步进率增加至首选值的110%，髌股关节峰值力降低14%。峰值肌肉力量也改变了作为一个结果，增加步率与髋关节，膝关节和踝关节伸肌的力量，髋关节外展肌的力量都减少了中期的立场。与90%步速条件相比，在较高步速下，摆动早期和晚期的股直肌和腘绳肌峰值负荷分别随之增加。最大站立相膝关节屈曲度随步频的增加而降低，并且被认为是髌股关节负荷减少的最重要的预测因素。增加步频是减少髌股关节力的有效策略，并且可以有效调节可能导致髌股关节疼痛的生物力学因素。
Increasing step rate has been shown to elicit changes in joint kinematics and kinetics during running, and has been suggested as a possible rehabilitation strategy for runners with patellofemoral pain. The purpose of this study was to determine how altering step rate affects internal muscle forces and patellofemoral joint loads, and then to determine what kinematic and kinetic factors best predict changes in joint loading. We recorded whole body kinematics of 30 healthy adults running on an instrumented treadmill at three step rate conditions (90%, 100%, and 110% of preferred step rate). We then used a 3D lower extremity musculoskeletal model to estimate muscle, patellar tendon, and patellofemoral joint forces throughout the running gait cycles. Additionally, linear regression analysis allowed us to ascertain the relative influence of limb posture and external loads on patellofemoral joint force. Increasing step rate to 110% of preferred reduced peak patellofemoral joint force by 14%. Peak muscle forces were also altered as a result of the increased step rate with hip, knee and ankle extensor forces, and hip abductor forces all reduced in mid-stance. Compared to the 90% step rate condition, there was a concomitant increase in peak rectus femoris and hamstring loads during early and late swing, respectively, at higher step rates. Peak stance phase knee flexion decreased with increasing step rate, and was found to be the most important predictor of the reduction in patellofemoral joint loading. Increasing step rate is an effective strategy to reduce patellofemoral joint forces and could be effective in modulating biomechanical factors that can contribute to patellofemoral pain.