Xiao Xiang, Hu Hui Jing, Li Li Fang, Li Le
Department of Rehabilitation Medicine, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.
Department of Rehabilitation Medicine, Luo Hu peoples' hospital, Shenzhen, China.
Math Biosci Eng. 2019 Feb 26;16(3):1611-1624. doi: 10.3934/mbe.2019077.
This study aimed to investigate the effects of handedness on motion accuracies and to compare 3D kinematic data in reaching performance of dominant and non-dominant hand with the influence of movement speed and target locations. Twelve healthy young adults used self-selected and fast speed to reach for three different target locations as follows: frontal, ipsilateral and contralateral to the performing hand, with equal distance. Both hands were tested and kinematic parameters were recorded by 3D motion analysis system. Successful rate, reach path ratio, mean and peak velocity, the timing of peak velocity and ROM of joints were analyzed. Reach path ratio was smaller when using the dominant hand ( < 0.01) and fast speed ( < 0.01) to perform the movement, but the successful rate of the dominant hand was lower than non-dominant hand during fast speed reaching (99.1% vs 100%). Contralateral movement had lower velocity than the other two target locations, while velocity did not vary between non-dominant and dominant hand. The timing of peak velocity occurred significantly later for fast speed movements ( < 0.01). Trunk rotation was significantly smaller when using the dominant hand, fast movement speed or reaching to the ipsilateral target. The ROM of elbow and wrist flexion-extension decreased in contralateral reaching. The performance of the dominant hand and/or fast speed movements was more efficient with straighter hand path and less trunk rotation, but the successful rate decreased in dominant hand during fast speed movements. The timing of peak velocity occurred later during fast movement in both hands indicating a decreased feedback phase. Target location can influence movement strategy as reaching to contralateral target required more proximal movements and ipsilateral reaching used more distal segment movements.
本研究旨在调查利手对运动准确性的影响，并比较优势手和非优势手在不同运动速度和目标位置下的伸手动作三维运动学数据。12名健康的年轻成年人以自选速度和快速伸手去够三个不同的目标位置，分别为：相对于执行手的前方、同侧和对侧，距离相等。对双手均进行测试，并通过三维运动分析系统记录运动学参数。分析成功率、伸手路径比、平均速度和峰值速度、峰值速度出现的时间以及关节活动度。使用优势手（<0.01）和快速速度（<0.01）进行动作时，伸手路径比更小，但在快速伸手过程中，优势手的成功率低于非优势手（99.1%对100%）。对侧运动的速度低于其他两个目标位置，而非优势手和优势手之间的速度没有差异。快速速度运动时，峰值速度出现的时间显著延迟（<0.01）。使用优势手、快速运动速度或伸手去够同侧目标时，躯干旋转显著更小。对侧伸手时，肘部和腕部屈伸的关节活动度减小。优势手和/或快速速度运动的表现更高效，手部路径更直，躯干旋转更少，但快速运动时优势手的成功率降低。双手在快速运动时峰值速度出现的时间延迟，表明反馈阶段减少。目标位置会影响运动策略，因为伸手去够对侧目标需要更多近端运动，而同侧伸手则更多使用远端节段运动。
