Tu Jean, Bruce Olivia L, Edwards W Brent
Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary T2N 1N4, Canada; McCaig Institute for Bone and Joint Health, University of Calgary, Calgary T2N 4Z6, Canada.
Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary T2N 1N4, Canada; Department of Radiology, Stanford University, Stanford, CA 94305-2004, USA.
J Sport Health Sci. 2024 Sep 3;14:100978. doi: 10.1016/j.jshs.2024.100978.
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 (p < 0.001) as well as axial (p < 0.001) and resultant (p < 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 (r = 0.49) as well as peak resultant acceleration and joint contact force (r = 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 (r = 0.12) as well as peak resultant acceleration and ankle joint contact force (r = 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.
本研究旨在评估在平地跑步过程中，随着步幅长度的变化，胫骨峰值加速度与踝关节峰值接触力之间的关系。
27名身体活跃的参与者在5种步幅长度条件下，以各自偏好的速度进行10次跑步试验：偏好步幅长度、偏好步幅长度±5%以及偏好步幅长度±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估算踝关节接触力。
总体而言，胫骨峰值轴向加速度（p < 0.001）以及轴向（p < 0.001）和合成（p < 0.001）踝关节接触力均随步幅长度增加而增大。在每个步幅条件下的10步内取平均值时，峰值轴向加速度与关节接触力之间（r = 0.49）以及峰值合成加速度与关节接触力之间（r = 0.51）观察到中等程度的正相关。然而，37%的参与者表现出无相关性或负相关性。在逐步步幅的基础上进行检查时，参与者之间峰值轴向加速度与关节接触力（r = 0.12）以及峰值合成加速度与踝关节接触力（r = 0.18）之间仅存在微弱相关性。
这些结果表明，在平地跑步过程中，响应步幅长度变化时，逐步步幅的情况下胫骨加速度不应被用作踝关节接触力的替代指标。对于一些跑步者来说，10步平均胫骨加速度指标可能有用，但需要进行初步的实验室评估来确定这些个体。
