Department of Neuromedicine and Movement Science, Center for Elite Sports Research, Norwegian University of Science and Technology, Trondheim, Norway.
Department of Neuromedicine and Movement Science, Center for Elite Sports Research, Norwegian University of Science and Technology, Trondheim, Norway.
J Biomech. 2022 Aug;141:111212. doi: 10.1016/j.jbiomech.2022.111212. Epub 2022 Jun 28.
The literature on shoulder (humerothoracic) kinematics in manual wheelchair propulsion is growing. Inconsistencies in the reporting of which rotation sequence is used to compute three-dimensional (3D) angles complicates the interpretation and comparison between studies. The purpose of this study was to compare the effects of three often used and recommended rotation sequences (ZXY, XZY, and YXY) and two tracking methods (anatomical and cluster only) on the humerothoracic kinematics of manual wheelchair propulsion. Fourteen able-bodied participants performed manual wheelchair propulsion on a treadmill, while a motion capture system recorded the movements at 120 Hz. Humeral and thoracic segment coordinate systems were constructed according to ISB recommendations. Humerothoracic angles were calculated using each of the three rotation sequences. The ZXY and XZY sequences yielded similar angles in terms of both shape and amplitude, but, perhaps unsurprisingly, these differed substantially from the YXY sequence. Anatomical tracking showed neither gimbal locks nor phase angle discontinuities for any rotation sequence, while cluster tracking yielded phase angle discontinuities for the ZXY and YXY rotation sequences. The two tracking methods yielded similar joint angles for all sequences except for internal/external rotation, and the cluster-only method had larger variability than the anatomical method. These results highlight the importance of reporting which rotation sequence and tracking method are used when calculating humerothoracic angles in order to allow for straightforward interpretation of results and comparison across studies.
关于手动轮椅推进中的肩部（肩胸）运动学的文献正在不断增加。在报告用于计算三维（3D）角度的旋转顺序时存在不一致性，这使得在研究之间进行解释和比较变得复杂。本研究的目的是比较三种常用且推荐的旋转顺序（ZXY、XZY 和 YXY）和两种跟踪方法（解剖和仅聚类）对手动轮椅推进中肩胸运动学的影响。14 名健全人在跑步机上进行了手动轮椅推进，同时运动捕捉系统以 120 Hz 的频率记录运动。根据 ISB 建议构建了肱骨和胸段坐标系。使用这三种旋转顺序中的每一种计算肩胸角度。ZXY 和 XZY 序列在形状和幅度上产生了相似的角度，但也许并不奇怪，它们与 YXY 序列有很大的不同。解剖跟踪对于任何旋转顺序都没有出现万向节锁或相位角不连续，而聚类跟踪对于 ZXY 和 YXY 旋转顺序则出现了相位角不连续。除了内外旋转外，两种跟踪方法对于所有序列都产生了相似的关节角度，而仅聚类方法的变异性大于解剖方法。这些结果强调了在计算肩胸角度时报告使用的旋转顺序和跟踪方法的重要性，以便能够直接解释结果并在研究之间进行比较。
