Background

The inability to standardize footwear is a potential issue when measuring landing kinetics in non-laboratory settings. This study determined the impact of not standardizing footwear on load and load symmetry during landing. A secondary purpose of this study was to introduce the Load Analysis Program, an open-source MATLAB® user-interface for computing kinetic and kinetic symmetry from data collected using loadsol® sensors.

Methods

Forty uninjured participants completed bilateral and unilateral landing tasks in their own preferred athletic footwear and in laboratory-standardized footwear. Peak impact force, impulse, and a limb symmetry index of both kinetic outcomes were computed using loadsol® sensors (200 Hz) for both footwear conditions, and compared between footwear conditions using intraclass correlation coefficients and Bland-Altman plots.

Findings

The agreement between the preferred and standardized conditions was good to excellent for peak impact force, peak impact force limb symmetry index, and impulse limb symmetry index during the bilateral task (intraclass correlation coefficient = 0.870–0.951). The agreement was moderate to poor for unilateral limb symmetry index measures (intraclass correlation coefficient = 0.399–0.516). During the preferred footwear condition, impulse was greater for the left limb during bilateral landing, and peak impact force during unilateral landing on the right limb was decreased, when compared to the standardized footwear condition (p < 0.05).

Interpretation

These results suggest that while not standardizing footwear can alter the results of certain load metrics, laboratory-relevant landing mechanics information can be obtained with participants wearing their own footwear.

中文翻译：

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标准化鞋类对载荷和载荷对称性的影响

背景

在非实验室环境中测量着陆动力学时，无法标准化鞋类是一个潜在问题。这项研究确定了不标准化鞋类对着陆期间负载和负载对称性的影响。本研究的第二个目的是介绍负载分析程序，这是一个开源 MATLAB® 用户界面，用于从使用 loadsol® 传感器收集的数据中计算动力学和动力学对称性。

方法

四十名未受伤的参与者穿着自己喜欢的运动鞋和实验室标准化的鞋完成双边和单边着陆任务。使用 loadsol® 传感器 (200 Hz) 计算两种运动结果的峰值冲击力、脉冲和肢体对称指数，并使用类内相关系数和 Bland-Altman 图在鞋类条件之间进行比较。

发现

首选条件和标准化条件之间的一致性在双边任务期间的峰值冲击力、峰值冲击力肢体对称指数和冲动肢体对称指数方面非常吻合（组内相关系数 = 0.870-0.951）。单侧肢体对称指数测量的一致性为中等至差（组内相关系数 = 0.399-0.516）。在首选鞋类条件下，与标准鞋类条件相比，双侧着地时左肢的冲击力更大，右肢单侧着地时的峰值冲击力降低（p  < 0.05）。

解释

这些结果表明，虽然不标准化鞋类可以改变某些负载指标的结果，但可以通过参与者穿着自己的鞋类获得与实验室相关的着陆力学信息。