Abrupt deceleration is a common practice in several sports, where sudden changes of direction are needed to reach the highest performance level. When inappropriately performed, these actions can impose excessive mechanical loads at the lower limb joints, specifically at the knee and ankle joints, usually associated with increased risk of injury. This work aims to estimate muscle forces and muscle contributions to the acceleration of the center of mass during a rapid maximal single-leg forward braking and backward acceleration task. Fourteen elite male injury-free indoor-sports athletes participated in this work. Scaled generic musculoskeletal models, consisting of 12 segments, 23 degrees of freedom, and 92 muscle-tendon actuators were used in OpenSim software. Due to the nature of the musculoskeletal system, all muscles are considered when joint and segment positions, velocities, and accelerations are calculated, resulting in muscles acting to accelerate joints it does not span. The knowledge of muscle interaction during this multijoint task is important and was achieved through an induced acceleration analysis. The vasti (−9.18 ± 2.09 and −7.63 ± 1.33 N/Kg) were the main contributors to the centre of mass deceleration profile along the anterior/posterior direction, aided by the soleus muscle (9.72 ± 2.35 and 9.62 ± 2.07 N/Kg), which counteracted most of the effects applied by gravity along the vertical direction, during both phases. This study provides a computational approach to quantify the dynamical interactions between muscles and joints during an abrupt anterior/posterior deceleration task, thus giving robust and insightful indicators that can be implemented in injury prevention protocols.

突然减速是几种运动的惯常做法，需要突然改变方向才能达到最高性能。如果执行不当，这些动作可能会在下肢关节（特别是在膝盖和脚踝关节）施加过大的机械负荷，通常会增加受伤的风险。这项工作旨在估计在快速最大单腿向前制动和向后加速任务期间，肌肉力和肌肉对质心加速的贡献。十四名精英男性无损伤室内运动运动员参加了这项工作。在OpenSim软件中使用了由12个部分，23个自由度和92个肌腱执行器组成的按比例缩放的通用肌肉骨骼模型。由于肌肉骨骼系统的性质，在计算关节和节段的位置，速度和加速度时，会考虑所有肌肉，从而导致肌肉加速不跨越的关节。在此多关节任务中，肌肉相互作用的知识很重要，并且是通过诱导加速度分析获得的。的大比目鱼（−9.18±2.09和−7.63±1.33 N / Kg）是比目鱼肌（9.72±2.35和9.62±2.07 N / Kg）辅助沿前后方向质心减速曲线的主要因素，这抵消了重力在两个阶段中沿垂直方向施加的大部分影响。这项研究提供了一种计算方法，可以量化突然的前后减速任务期间肌肉与关节之间的动力相互作用，从而提供可以在伤害预防方案中实施的强大而有见地的指标。