Background

Adequate footwear is an important factor for reducing the risk of slipping; as shoe outsoles wear down, friction decreases, and slip and fall risk increases. Wear theory suggests that gait kinetics may influence rate of tread wear.

Research question

Do the kinetics of walking (i.e., the shoe-floor force interactions) affect wear rate?

Methods

Fourteen participants completed dry walking trials during which ground reaction forces were recorded across different types of shoes. The peak normal force, shear force, and required coefficient of friction (RCOF) were calculated. Participants then wore alternating pairs of shoes in the workplace each month for up to 24 months. A pedometer was used to track the distance each pair of shoes was worn and tread loss was measured. The wear rate was calculated as the volumetric tread loss divided by the distance walked in the shoes. Three, mixed linear regression models were used to assess the impact of peak normal force, shear force, and RCOF on wear rate.

Results

Wear rate was positively associated with peak RCOF and with peak shear force, but was not significantly related to peak normal forces.

Significance

The finding that shear forces and particularly the peak RCOF are related to wear suggests that a person’s gait characteristics can influence wear. Therefore, individual gait kinetics may be used to predict wear rate based on the fatigue failure shoe wear mechanism.

中文翻译：

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步态动力学影响鞋面磨损率

背景

充足的鞋履是降低滑倒风险的重要因素；随着鞋外底磨损，摩擦减少，滑倒和跌倒的风险增加。磨损理论表明，步态动力学可能会影响胎面磨损率。

研究问题

行走的动力学（即鞋-地板力的相互作用）会影响磨损率吗？

方法

十四名参与者完成了干步行试验，在此期间记录了不同类型鞋子的地面反作用力。计算峰值法向力、剪切力和所需摩擦系数 (RCOF)。然后，参与者每个月在工作场所交替穿双鞋，持续长达 24 个月。计步器用于跟踪每双鞋的磨损距离并测量胎面损失。磨损率的计算方法是体积胎面损失除以穿鞋的距离。三、混合线性回归模型用于评估峰值法向力、剪切力和 RCOF 对磨损率的影响。

结果

磨损率与峰值 RCOF 和峰值剪切力呈正相关，但与峰值法向力没有显着相关性。

意义

剪切力，特别是峰值 RCOF 与磨损有关的发现表明，人的步态特征会影响磨损。因此，个体步态动力学可用于基于疲劳失效鞋磨损机制来预测磨损率。