Ko Ji Hynu, Han Dong Wook, Newell Karl M
Department of Sport Science, Chonbuk National University, Jeonju, South Korea.
Department of Sport Science, Chonbuk National University, Jeonju, South Korea.
Hum Mov Sci. 2017 Oct;55:255-263. doi: 10.1016/j.humov.2017.08.017. Epub 2017 Sep 1.
The purpose of the experiment was to investigate whether skill level differentially organizes the coordination of the postural system and upper limb kinematics in a pistol-aiming task. Participants aimed an air-pistol at a target center in 30s trials as accurately as possible while standing on a force platform with shooting arm joint kinematics recorded. The novice group had greater motion of the pistol end point, arm joints and the center of pressure than the skilled group. Principal components analysis (PCA) showed that the skilled group required 2 components as opposed to the 3 components of the novice group to accommodate the variance. Coherence analysis in the 0-1Hz bandwidth revealed that the coupling between posture and upper-limb movement was stronger in the skilled than the novice group. The findings are consistent with the view that skill acquisition reduces the kinematic variables into a lower dimensional functional unit that in pistol-aiming is defined over the collective posture and upper-limb system.
该实验的目的是研究在手枪瞄准任务中，技能水平是否会对姿势系统和上肢运动学的协调性产生不同的组织作用。参与者站在测力平台上，手持气手枪在30秒的试验中尽可能准确地瞄准目标中心，同时记录射击手臂关节的运动学数据。新手组手枪端点、手臂关节和压力中心的运动比熟练组更大。主成分分析（PCA）表明，熟练组需要2个成分来解释方差，而新手组则需要3个成分。在0-1Hz带宽内的相干分析表明，熟练组中姿势与上肢运动之间的耦合比新手组更强。这些发现与以下观点一致：技能习得将运动学变量简化为一个更低维度的功能单元，在手枪瞄准中，该功能单元是在整体姿势和上肢系统上定义的。
