Ko Ji-Hyun, Han Dong-Wook, Newell Karl M
a Department of Sport Science , Chonbuk National University , Jeonju , South Korea.
b Department of Kinesiology , University of Georgia , Athens , USA.
J Sports Sci. 2018 Apr;36(7):809-816. doi: 10.1080/02640414.2017.1343490. Epub 2017 Jun 19.
The study investigated the coordination and variability of posture and pistol motion for skilled pistol shooters and novices in a pistol-aiming task. The participants stood on a force platform and held a pistol with the preferred arm to aim for accuracy to a target on 30 s trials. The results revealed that the amount of the centre of pressure (COP) and pistol motion was lower for the expert than novice group. The time-varying structure of COP as indexed by multiscale entropy (MSE) and detrended fluctuation analysis (DFA) was also lower for the expert than the novice group. The relative phase between the COP in the anterior-posterior (AP) and pistol in the AP and between the COP in the medial-lateral (ML) and pistol in AP was close to inphase for the both groups. However, for the novice group the coordination patterns of posture and pistol motion were more variable with the pistol motion leading the posture motion while it was lagging in the skilled group. The findings show different qualitative and quantitative dynamics in pistol-aiming as a function of skill level with postural control foundational to supporting the reduced dispersion and complexity of the skilled arm-pistol motion.
该研究调查了熟练手枪射击者和新手在手枪瞄准任务中姿势与手枪动作的协调性和变异性。参与者站在测力平台上，用优势手臂握住手枪，在30秒的试验中瞄准目标以确保准确性。结果显示，专家组的压力中心（COP）和手枪动作量低于新手组。通过多尺度熵（MSE）和去趋势波动分析（DFA）得出的COP随时间变化的结构，专家组也低于新手组。两组前后方向（AP）上的COP与AP方向上手枪之间以及内侧-外侧方向（ML）上的COP与AP方向上手枪之间的相对相位均接近同相。然而，新手组姿势与手枪动作的协调模式更具变异性，手枪动作领先于姿势动作，而在熟练组中则是滞后。研究结果表明，作为技能水平的函数，手枪瞄准中存在不同的定性和定量动态，姿势控制对于支持熟练手臂-手枪动作的减少分散和复杂性至关重要。
