School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China.
Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai 200438, China.
Biomed Res Int. 2020 Mar 20;2020:9723563. doi: 10.1155/2020/9723563. eCollection 2020.
To explore the changes in knee sagittal angle and moment and patellofemoral joint (PFJ) force and stress before and after 12-week gait retraining.
A total of 30 healthy male recreational runners were randomized into a control group ( = 15) who ran in their original strike pattern using minimalist shoes or experimental group ( = 15) who ran in a forefoot strike pattern using minimalist shoes during the 12-week gait retraining. The kinematic and kinetic data of the dominant leg of the participants during the 12 km/h running were collected by 3D motion capture systems and 3D force platforms. Besides, the biomechanical property of the PFJ was calculated on the basis of the joint force model and the regression equation of the contact area.
After the 12-week gait retraining, 78% of the rearfoot strikers turned into forefoot strikers. Peak knee extension moment and peak PFJ stress decreased by 13.8% and 13.3% without altering the running speed, respectively. Meanwhile, no changes in maximum knee flexion angle/extension moment and PFJ force/stress were observed for the control group.
The 12-week gait retraining effectively reduced the PFJ stress, thereby providing a potential means of reducing the risk of patellofemoral pain syndrome while running.
探讨 12 周步态再训练前后膝关节矢状角和力矩以及髌股关节（PFJ）力和应力的变化。
共有 30 名健康男性休闲跑步者被随机分为对照组（n=15），他们穿着传统跑鞋以原始的着地方式跑步；实验组（n=15）在 12 周的步态再训练中穿着 minimalist 跑鞋采用前足着地方式跑步。参与者在以 12km/h 的速度跑步时，通过 3D 运动捕捉系统和 3D 力台收集其优势腿的运动学和动力学数据。此外，根据关节力模型和接触面积的回归方程计算 PFJ 的生物力学特性。
12 周步态再训练后，78%的后足着地者变成了前足着地者。在不改变跑步速度的情况下，膝关节伸展力矩峰值和 PFJ 峰值应力分别降低了 13.8%和 13.3%。同时，对照组的最大膝关节屈曲角度/伸展力矩和 PFJ 力/应力均无变化。
12 周步态再训练可有效降低 PFJ 应力，从而为降低跑步时髌股疼痛综合征的风险提供了一种潜在的手段。
