PDF(Sci-hub)
Abstract：
Motion capture systems are used in the analysis and interpretation of athlete movement patterns for a variety of reasons, but data integrity remains critical regardless. The extent to which marker location or constraining degrees of freedom (DOF) in the biomechanical model impacts on this integrity lacks consensus. Ten elite academy footballers performed bilateral overhead squats using a marker-based motion capture system. Kinematic data were calculated using four different marker sets with 3DOF and 6DOF configurations for the three joint rotations of the right knee. Root mean squared error differences between marker sets ranged in the sagittal plane between 1.02 and 4.19 degrees to larger values in the frontal (1.30-6.39 degrees) and transverse planes (1.33 and 7.97 degrees). The cross-correlation function of the knee kinematic time series for all eight marker-sets ranged from excellent for sagittal plane motion (>0.99) but reduced for both coronal and transverse planes (<0.9). Two-way ANOVA repeated measures calculated at peak knee flexion revealed significant differences between marker sets for frontal and transverse planes (p < 0.05). Pairwise comparisons showed significant differences between some marker sets. Marker location and constraining DOF while measuring relatively large ranges of motion in this population are important considerations for data integrity.
摘要：
运动捕捉系统用于运动员运动模式的分析和解释，原因有很多，但数据完整性仍然至关重要。生物力学模型中的标记位置或约束自由度(DOF)对该完整性的影响程度缺乏共识。十名精英学院足球运动员使用基于标记的动作捕捉系统进行了双边高空深蹲。对于右膝的三个关节旋转，使用具有3DOF和6DOF配置的四个不同标记集来计算运动学数据。标记集之间的均方根误差差异在矢状平面中的范围在1.02和4.19度之间，在额叶平面（1.30-6.39度）和横向平面（1.33和7.97度）中的较大值。所有八个标记集的膝关节运动学时间序列的互相关功能范围为矢状平面运动（>0.99），但冠状和横向平面均降低（<0.9）。在膝关节屈曲峰值处计算的双向ANOVA重复测量显示，额面和横面的标记集之间存在显着差异（p<0.05）。成对比较显示一些标记集之间的显著差异。标记位置和约束DOF同时测量该群体中相对较大的运动范围是数据完整性的重要考虑因素。
