The effects of a 12‐week gait retraining program on the adaptation of the medial gastrocnemius (MG) and muscle‐tendon unit (MTU) were investigated. 26 runners with a rearfoot strike pattern (RFS) were randomly assigned to one of two groups: gait retraining (GR) or control group (CON). MG ultrasound images, marker positions, and ground reaction forces (GRF) were collected twice during 9 km/h of treadmill running before and after the intervention. Ankle kinetics and the MG and MTU behavior and dynamics were quantified. Runners in the GR performed gradual 12‐week gait retraining transitioning to a forefoot strike pattern. After 12‐week, (1) ten participants in each group completed the training; eight participants in GR transitioned to non‐RFS with reduced foot strike angles; (2) MG fascicle contraction length and velocity significantly decreased after the intervention for both groups, whereas MG forces increased after intervention for both groups; (3) significant increases in MTU stretching length for GR and peak MTU recoiling velocity for both groups were observed after the intervention, respectively; (4) no significant difference was found for all parameters of the series elastic element. Gait retraining might potentially influence the MG to operate at lower fascicle contraction lengths and velocities and produce greater peak forces. The gait retraining had no effect on SEE behavior and dynamics but did impact MTU, suggesting that the training was insufficient to induce mechanical loading changes on SEE behavior and dynamics.

中文翻译：

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使用极简鞋进行步态再训练对跑步过程中腓肠肌内侧肌腱单位行为和动力学的影响

研究了为期 12 周的步态再训练计划对内侧腓肠肌 (MG) 和肌腱单位 (MTU) 适应的影响。 26 名具有后足着地模式 (RFS) 的跑步者被随机分配到两组中的一组：步态再训练组 (GR) 或对照组 (CON)。干预前后在 9 km/h 跑步机上跑步期间两次收集 MG 超声图像、标记位置和地面反作用力 (GRF)。对踝关节动力学以及 MG 和 MTU 行为和动力学进行了量化。 GR 中的跑步者进行为期 12 周的逐步步态再训练，过渡到前脚着地模式。 12周后，（1）每组10名参与者完成训练； GR 中的 8 名参与者过渡到非 RFS，脚着地角度减小； (2)两组干预后MG束收缩长度和速度均显着下降,而干预后MG力均增加; (3) 干预后两组GR的MTU拉伸长度和峰值MTU反冲速度均显着增加； (4)串联弹性元件各参数均未发现显着性差异。步态再训练可能会影响 MG 以较低的肌束收缩长度和速度运行，并产生更大的峰值力。步态再训练对 SEE 行为和动力学没有影响，但确实影响 MTU，表明训练不足以引起 SEE 行为和动力学的机械负荷变化。