Joint angle variability in the time course of reaching movements
Joint angle variability in the time course of reaching movements
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DOI：
10.1016/j.clinph.2010.10.003
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发表时间：
2011-04-01
影响因子：
4.7
通讯作者：
Straube, A.
中科院分区：
文献类型：
--
作者：
Krueger, M.;Eggert, T.;Straube, A.
目的：研究运动控制过程是许多科学和实践领域的主要兴趣。在这种情况下，运动变异性越来越引起人们的兴趣。然而，到目前为止，人们对运动执行过程中变异性的时间过程知之甚少。本研究的目的是探讨视觉信息和任务规范对伸手动作中关节角度运动变异性的影响。方法：受试者反复伸手拿手柄。运动变异性通过受试者内平均关节角的标准差来量化。分析的重点是运动执行过程中变异性的时间过程。结果：视觉信息的可获得性对关节角度变异的时间过程没有影响，而达到准确度的任务规范对关节角度变异的时间过程有影响。在高精度条件下，需求变异性在达到最大值后减小的幅度更大。结论：结果表明，视觉信息的可用性在训练良好的伸手动作的控制中起着次要作用。这表明本体感觉信息是控制这些运动的主要反馈来源。意义：分析运动变异性的时间过程可能是一种有价值的方法来研究运动障碍的中枢或外周原因，用于诊断和康复目的。(C) 2010年国际临床神经生理学联合会。爱思唯尔爱尔兰有限公司出版。版权所有。
Objective: Investigating motor control processes is of primary interest in a number of scientific and practical fields. Movement variability is of increasing interest in this context. However, until now little has been known about the time course of variability during movement execution. The objective of this study was to investigate the influence of visual information and task specification on the variability of joint angle motion in reaching movements.Methods: Subjects repetitively reached for a handle. Movement variability was quantified by the within-subjects standard deviation of mean joint angle. The analysis focused on the time course of variability during movement execution.Results: The availability of visual information did not influence the time course of joint angle variability whereas task specification on reaching accuracy did. Under high accuracy demand variability was reduced more strongly after reaching its maximum.Conclusions: Results suggest that the availability of visual information plays a minor role in the control of well-trained reaching movements. This suggests that proprioceptive information is the main feedback source to control these movements.Significance: The analysis of the time course of movement variability might be a valuable method to investigate the central or peripheral causes of movement disorders for diagnostic and rehabilitation purposes. (C) 2010 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.