The effects of practice on limb kinematics in a throwing task.
The effects of practice on limb kinematics in a throwing task.
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投掷任务中练习对肢体运动学的影响。
DOI：
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发表时间：
1989
影响因子：
1.4
通讯作者：
Karl M. Newell
中科院分区：
文献类型：
--
作者：
P. V. Mcdonald;R. Emmerik;Karl M. Newell
在飞镖投掷任务中的肢体运动学的实践效果进行了检查，以测试目前的三个假设，肢体控制：轨迹形成;终点控制;和协调的关节空间控制。练习给予了5名男性受试者的相对熟练的优势和相对不熟练的非优势肢体，以分析协调获得的早期阶段。非优势肢体表现出高的绝对关节交叉相关性，在整个实践和一致性的手轨迹的高变异性。优势肢体在练习中表现出腕肘和腕肩交叉相关性的显著降低，同时还保持一致的手轨迹和显著更高的得分表现。研究结果表明，实践效果可以看出，在协调模式和肢体运动的各种参数的变化，但变量之间的变化关系表明，控制不能归因于任何一个先进的三个假设。有人建议，观察到的不变性或变异的肢体轨迹，终点控制，和协调关节角度是一个反映更多的全球性的参数出现从流场特性的生物体，环境和任务的相互作用。
The effect of practice on limb kinematics in a dart-throwing task was examined to test three current hypotheses regarding limb control: trajectory formation; end-point control; and coordinated joint-space control. Practice was given to both the relatively well-practiced dominant ant the relatively unpracticed nondominant limbs of 5 male subjects to permit analysis of the early phase of coordination acquisition. The nondominant limb demonstrated high absolute joint cross-correlations with high variability throughout practice and consistency in the hand trajectory. The dominant limb exhibit a significant decrease in wrist-elbow and wrist-shoulder cross-correlations over practice while also maintaining a consistent hand trajectory and significantly higher scoring performance. The findings demonstrate that practice effects can be seen in both coordination mode and variability of various parameters of limb motion, but the changing relationship between the variables suggests that control cannot be ascribed to any one of the three hypotheses advanced. It is proposed that the observed invariance or variance in limb trajectories, end-point control, and coordinated joint angles are a reflection of more global parameters emerging from the flow field properties of the organism, environment, and task interaction.
影响因子：
14.5
作者：
ABEND, W;BIZZI, E;MORASSO, P
通讯作者：
MORASSO, P
影响因子：
2.5
作者：
GEORGOPOULOS, AP;KALASKA, JF;MASSEY, JT
通讯作者：
MASSEY, JT