Abstract:

The aim of this study was to investigate the similarities of Center of Pressure (COP) trajectories during barefoot walking and jogging, based on plantar pressure data collected from 32 healthy volunteers. 32 subjects walk or run on a two-meter footscan® system at a self-selected speed for 5 valid trials respectively. For each trial, a sequence of frames is generated which records the instantaneous pressure value of the reaction between body and the supporting surface. Similarities between COP trajectories are calculated. Results show that similarities between walking and jogging COP trajectories are lower than 0.25, while similarities between left and right COP trajectories during the same motion status (walking or jogging) is higher than 0.91. In addition, intrasubject similarities are significantly higher than those of intersubject. Moreover, similarities between the same sides are significantly higher than those of different sides. COP trajectories similarities between walking and jogging are very low which indicates COP trajectories can distinguish walking from jogging. During the same motion, intersubject similarities are high. In addition, intrasubject similarities are even higher. This study provides a reliable dataset for clinical diagnosis, rehabilitation evaluation, orthosis prescription and sports exercises.

Key words: plantar pressure, center of pressure, similarity, walking, jogging

摘要：

应用 footscan® 足底压力测量系统, 对 32 例健康女大学生被试在步行和慢跑时足底压力中心(centre of pressure, COP)轨迹的变化规律进行不同运动模式下的对照研究, 分别分析左足、右足在5 次步行或慢跑时整个支撑期的COP 轨迹及其相似度。结果表明: 1) 不同运动模式(步行与慢跑)的COP 轨迹相似度低于0.25; 2) 同一运动模式(步行或慢跑)下, 左侧、右侧的COP 轨迹均具有很高的相似度(大于0.91)。其中被试内(同一被试) COP 轨迹相似度高于被试间(不同被试), 且前者方差低于后者, 差值具有显著意义; 被试内(同一被试)同侧足之间的COP 轨迹相似度高于异侧足间, 差值具有统计学意义。通过分析得到: 步行和慢跑两个运动模式的COP 轨迹相似度很低, COP 轨迹可以识别不同的运动模式; 运动模式相同时, 不同被试间的COP轨迹相似度较高, 且同一被试内同一侧的COP 轨迹相似度更高。研究结果可以为临床诊断、康复评定、矫形处方和运动训练等提供参考依据。

关键词: 动态足底压力, 足底压力中心轨迹, 相似度, 步行, 慢跑