Abstract：
The gait cycle can be divided into four functional rocker units. Although the widespread use of the OptoGait (OG) system and the Freemed (FM) platform, their accuracy has not been tested. An observational study was completed with eighteen healthy volunteers to determine the accuracy of OG and FM for overground walking gait analysis. The pairwise comparison between data obtained from OG, FM and high-speed video analysis revealed significant differences for most of the measurements (p < 0.05). ICCs revealed an excellent absolute agreement between measurements (ICCs > 0.94) for all measures for OG systems compared to video-analysis. When considering FM vs. video-analysis, ICCs showed good absolute agreement for rocker 1 (ICC = 0.86) and 3 (ICC = 0.82), excellent for rocker 2 (ICC = 0.93) and poor (ICC < 0.5) for rocker 4. Bland-Altman plots (95% limits of agreement) revealed heteroscedasticity of error for OG in all variables for foot rockers (r2 > 0.1) while no heteroscedasticity of error was found when using FM (r2 < 0.1). This study indicates that the OG system and the FM platform can provide consistent foot rockers values when walking at a constant velocity. The differences between the systems assessed and their agreement and consistency values advise against their interchangeable use.
摘要：
步态周期可以分为四个功能摇臂单元。尽管OptoGait（OG）系统和Freemed（FM）平台的广泛使用，其准确性尚未经过测试。对18名健康志愿者完成了一项观察性研究，以确定OG和FM用于地面行走步态分析的准确性。从OG获得的数据之间的成对比较，FM和高速视频分析显示，大多数测量值存在显着差异（p<0.05）。ICC显示，与视频分析相比，OG系统的所有测量值之间的绝对一致性（ICC>0.94）。当考虑FM与视频分析，ICC对摇杆1(ICC=0.86)和3(ICC=0.82)显示出良好的绝对一致性，对于摇杆2（ICC=0.93）和较差（ICC<0.5）摇杆4。Bland-Altman图（95％的一致性极限）揭示了脚摇杆的所有变量中OG的误差异方差性（r2>0.1），而使用FM（r2<0.1）时没有发现误差异方差性。这项研究表明，以恒定速度行走时，OG系统和FM平台可以提供一致的脚摇杆值。评估的系统与其协议和一致性值之间的差异建议不要互换使用。
