This study aimed to evaluate the relationship between peak tibial acceleration and peak ankle joint contact forces in response to stride length manipulation during level-ground running. Twenty-seven physically active participants ran 10 trials at preferred speed in each of 5 stride length conditions: preferred, ±5 %, and ±10 % of preferred stride length. Motion capture, force platform, and tibial acceleration data were directly measured, and ankle joint contact forces were estimated using an inverse-dynamics-based static optimization routine. In general, peak axial tibial accelerations ( < 0.001) as well as axial ( < 0.001) and resultant ( < 0.001) ankle joint contact forces increased with stride length. When averaged within the 10 strides of each stride condition, moderate positive correlations were observed between peak axial acceleration and joint contact force ( = 0.49) as well as peak resultant acceleration and joint contact force ( = 0.51). However, 37% of participants illustrated either no relationship or negative correlations. Only weak correlations across participants existed between peak axial acceleration and joint contact force ( = 0.12) as well as peak resultant acceleration and ankle joint contact force ( = 0.18) when examined on a step-by-step basis. These results suggest that tibial acceleration should not be used as a surrogate for ankle joint contact force on a step-by-step basis in response to stride length manipulations during level-ground running. A 10-step averaged tibial acceleration metric may be useful for some runners, but an initial laboratory assessment would be required to identify these individuals.

中文翻译：

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单独的胫骨加速度并不是响应步幅长度操作的胫骨负载的有效替代测量值


本研究旨在评估平地跑步期间步幅长度操作时的峰值胫骨加速度和峰值踝关节接触力之间的关系。 27 名身体活跃的参与者在 5 种步长条件下以首选速度进行了 10 次试验：首选、首选步长的 ±5% 和 ±10%。直接测量运动捕捉、力平台和胫骨加速度数据，并使用基于逆动力学的静态优化程序来估计踝关节接触力。一般来说，峰值轴向胫骨加速度 (< 0.001) 以及轴向 (< 0.001) 和合成 (< 0.001) 踝关节接触力随着步幅长度的增加而增加。当在每个步幅条件的 10 步内取平均值时，观察到峰值轴向加速度和关节接触力 (= 0.49) 以及峰值合成加速度和关节接触力 (= 0.51) 之间存在中等正相关性。然而，37% 的参与者表示没有关系或呈负相关。当逐步检查时，参与者之间的峰值轴向加速度和关节接触力（= 0.12）以及峰值合成加速度和踝关节接触力（= 0.18）之间仅存在微弱的相关性。这些结果表明，不应将胫骨加速度用作踝关节接触力的替代，以响应平地跑步期间步幅长度的操作。 10 步平均胫骨加速度指标可能对某些跑步者有用，但需要进行初步实验室评​​估才能识别这些人。