Golenia Laura, Bongers Raoul M, van Hoorn Jessika F, Otten Egbert, Mouton Leonora J, Schoemaker Marina M
University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences, Sector F, FA23, P.O. Box 196, 9700 AD Groningen, The Netherlands.
University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences, Sector F, FA23, P.O. Box 196, 9700 AD Groningen, The Netherlands.
Hum Mov Sci. 2018 Aug;60:202-213. doi: 10.1016/j.humov.2018.06.009. Epub 2018 Jun 26.
High motor variability is an often-found characteristic of Developmental Coordination Disorder (DCD). Still, the role of high motor variability in DCD needs further examination. This study focused on variability in coordination patterns, which is essential considering that DCD is a coordination disorder. We examined variability in coordination patterns of the arm over repetitions of trials in goal-directed reaching movements. This variability was partitioned into variability that does not affect the index fingertip position (V) and variability that does affect the index fingertip position (V). This study aimed to increase the understanding of motor variability in DCD by comparing V and V between children with DCD and typically developing (TD) children in a goal-directed reaching task. Twenty-two children (eleven with DCD) ages 6-11 performed 30 reaching movements. The Uncontrolled Manifold method was used to quantify V and V. Results showed that children with DCD had more V than TD children while V was similar between groups, showing that coordination patterns in children with DCD are more variable, but interestingly, this higher variability does not affect performance. This study indicates that high motor variability in DCD is not necessarily negative. Possible roles of motor variability in DCD are discussed.
高运动变异性是发育性协调障碍（DCD）常见的一个特征。然而，高运动变异性在DCD中的作用仍需进一步研究。本研究聚焦于协调模式的变异性，鉴于DCD是一种协调障碍，这一点至关重要。我们在目标导向的伸手动作试验重复过程中，研究了手臂协调模式的变异性。这种变异性被划分为不影响食指指尖位置的变异性（V）和影响食指指尖位置的变异性（V）。本研究旨在通过在目标导向伸手任务中比较DCD儿童与发育正常（TD）儿童之间的V和V，增进对DCD中运动变异性的理解。22名6至11岁的儿童（11名患有DCD）进行了30次伸手动作。采用非受控流形方法来量化V和V。结果显示，DCD儿童的V比TD儿童更多，而两组之间的V相似，这表明DCD儿童的协调模式更具变异性，但有趣的是，这种更高的变异性并不影响表现。本研究表明，DCD中的高运动变异性不一定是负面的。文中讨论了运动变异性在DCD中的可能作用。
