Beschorner Kurt E, Albert Devon L, Redfern Mark S
Department of Bioengineering, University of Pittsburgh, Benedum Engineering Hall #302, 3700 O'hara St., Pittsburgh, PA 15261, United States.
Gait Posture. 2016 Jul;48:256-260. doi: 10.1016/j.gaitpost.2016.06.003. Epub 2016 Jun 11.
The required coefficient of friction (RCOF) is frequently reported in the literature as an indicator of slip propensity. This study aimed to further develop slip prediction models based on RCOF by examining slips under moderately slippery conditions where the RCOF was approximately equal to the available coefficient of friction. Baseline RCOFs were found for normal walking trials and then an unexpected slip was introduced with a moderately slippery boot-floor contaminant combination for thirty-one subjects. Slip outcomes (i.e., whether a subject experienced a slip) were assessed based on the displacement of a marker placed on the heel. A logistic regression analysis was used to model the impact of RCOF on slipping. Results showed that subjects who walked with a greater RCOF were found to have a higher probability of slipping. The predicted probability of a slip across the RCOF ranged from 3% to 95% and an increase of 0.01 in RCOF was associated with a slipping odds ratio of 1.7. Thus, modest differences in RCOF can have a dramatic impact on slip propensity. This study shows that RCOF can be a sensitive and valid predictor of slipping in realistic frictional environments.
所需摩擦系数（RCOF）在文献中经常被报道为滑倒倾向的指标。本研究旨在通过在RCOF约等于可用摩擦系数的中等滑溜条件下检查滑倒情况，进一步开发基于RCOF的滑倒预测模型。在正常行走试验中确定基线RCOF，然后对31名受试者使用中等滑溜的靴子 - 地面污染物组合引入意外滑倒。基于放置在脚后跟的标记的位移评估滑倒结果（即受试者是否经历滑倒）。使用逻辑回归分析来模拟RCOF对滑倒的影响。结果表明，RCOF较大的受试者滑倒的可能性更高。RCOF范围内滑倒的预测概率为3％至95％，RCOF增加0.01与滑倒优势比1.7相关。因此，RCOF的适度差异可能对滑倒倾向产生巨大影响。本研究表明，RCOF可以成为现实摩擦环境中滑倒的敏感且有效的预测指标。
