Neuromechanics Laboratory, Old Dominion University, United States.
Neuromechanics Laboratory, Old Dominion University, United States.
J Biomech. 2024 Jan;162:111906. doi: 10.1016/j.jbiomech.2023.111906. Epub 2023 Dec 18.
Calculating upper extremity kinematics during overhead movements presents with problems typically not seen for the lower extremity due to the large range of motion. Due to these unique issues, different rotation sequences have been suggested to circumvent challenges due to gimbal lock (GL) and angle coherence (AC). The purpose of this study is to determine the most appropriate rotation sequence for shoulder angle calculation during a volleyball attack.
15 healthy experienced volleyball players (women = 8) performed 5 attacks off a stationary ball. A 12-camera 3D motion capture system was utilized to record trunk and arm kinematics to compare joint angles calculated using the YXY, ZXY, XZY, YXZ, ZYX, and XYZ rotation sequences. Instances of GL and AC inconsistences were marked for each trial. The last 3 trials were used for analysis.
The YXY and XYZ sequences presented with the least total number of errors (12 and 5, respectively). 5 instances of GL were present in the XYZ sequence while none were recorded for the YXY sequence. All other sequences returned incoherent angles that greatly exceeded known ranges of motion.
When performing kinematic analyses during a volleyball attack, researchers should adhere to ISB recommendations and employ the Eulerian YXY sequence for calculations. If greater anatomical understanding is desired, the XYZ sequence may be utilized for most subjects.
本研究旨在确定在排球扣球过程中计算肩部角度时最适合的旋转顺序。
15 名健康有经验的排球运动员（女性=8 名）从静止球上进行了 5 次扣球。使用 12 个摄像头的 3D 运动捕捉系统记录躯干和手臂运动学，以比较使用 YXY、ZXY、XZY、YXZ、ZYX 和 XYZ 旋转顺序计算的关节角度。为每个试验标记了出现万向节锁定（GL）和角度一致性（AC）不一致的实例。最后 3 次试验用于分析。
YXY 和 XYZ 序列的总错误数最少（分别为 12 和 5）。在 XYZ 序列中出现了 5 个 GL 实例，而在 YXY 序列中没有记录到任何 GL 实例。所有其他序列返回的角度不一致，大大超过了已知的运动范围。
在进行排球扣球的运动学分析时，研究人员应遵守国际运动生物力学学会的建议，并使用 Eulerian YXY 序列进行计算。如果需要更深入的解剖学理解，可以为大多数受试者使用 XYZ 序列。
