Department of Bioengineering, University of Pittsburgh, 301 Schenley Place, 4420 Bayard Street, Pittsburgh, PA, 15213, USA.
Gait Posture. 2021 May;86:157-161. doi: 10.1016/j.gaitpost.2021.03.006. Epub 2021 Mar 8.
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.
Do the kinetics of walking (i.e., the shoe-floor force interactions) affect wear rate?
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.
Wear rate was positively associated with peak RCOF and with peak shear force, but was not significantly related to peak normal forces.
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.
合适的鞋子是降低滑倒风险的一个重要因素；随着鞋底的磨损，摩擦力会降低，滑倒和摔倒的风险会增加。磨损理论表明，步态动力学可能会影响 tread wear 的速度。
行走的动力学（即鞋与地面的力相互作用）是否会影响磨损率？
14 名参与者在不同类型的鞋子上完成了干燥行走试验，在此期间记录了地面反作用力。计算了峰值法向力、剪切力和所需摩擦系数（RCOF）。然后，参与者在工作场所每月交替穿不同的鞋子，最长可达 24 个月。计步器用于跟踪每双鞋的行走距离，测量 tread loss。磨损率计算为体积 tread loss 除以穿着鞋子行走的距离。使用三个混合线性回归模型来评估峰值法向力、剪切力和 RCOF 对磨损率的影响。
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著关系。
剪切力，特别是峰值 RCOF 与磨损有关的发现表明，一个人的步态特征可能会影响磨损。因此，个体步态动力学可以根据疲劳失效的鞋磨损机制来预测磨损率。
