Cherng Rong-Ju, Hsu Yung-Wen, Chen Yung-Jung, Chen Jenn-Yeu
Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan.
Hum Mov Sci. 2007 Dec;26(6):913-26. doi: 10.1016/j.humov.2007.05.006. Epub 2007 Jul 20.
Maintenance of standing balance requires that sensory inputs be organized with the motor system. Current data regarding the influence of sensory inputs on standing balance in children with developmental coordination disorder (DCD) are limited. This study compared the influence of sensory organization and each sensory input on the standing stability between a group of 20 children, 4-6 years old, with DCD and an age- and gender-matched control group of 20 children. Three types of visual inputs (eyes open, eyes closed, or unreliable vision) and two types of somatosensory inputs (fixed or compliant foot support) were varied factorially to yield six sensory conditions. Standing stability was measured with a Kistler force plate for 30s and expressed as the center of pressure sway area. The results showed that the standing stability of the children with DCD was significantly poorer than that of the control children under all sensory conditions, especially when the somatosensory input was unreliable (compliant foot support) compared to when it was reliable (fixed foot support). The effectiveness of an individual sensory system, when it was the dominant source of sensory input, did not significantly differ between the groups. The results suggest that children with DCD experience more difficulty coping with altered sensory inputs, and that such difficulty is more likely due to a deficit in sensory organization rather than compromised effectiveness of individual sensory systems.
维持站立平衡需要感觉输入与运动系统协同运作。目前关于感觉输入对发育性协调障碍（DCD）儿童站立平衡影响的数据有限。本研究比较了感觉组织及每种感觉输入对一组20名4至6岁DCD儿童和年龄及性别匹配的20名儿童对照组站立稳定性的影响。三种视觉输入类型（睁眼、闭眼或不可靠视觉）和两种躯体感觉输入类型（固定或顺应性足部支撑）进行析因变化，产生六种感觉条件。使用奇石乐测力板测量30秒的站立稳定性，并表示为压力中心摆动面积。结果显示，在所有感觉条件下，DCD儿童的站立稳定性明显低于对照组儿童，尤其是当躯体感觉输入不可靠（顺应性足部支撑）时，与可靠（固定足部支撑）时相比。当个体感觉系统作为主要感觉输入源时，其有效性在两组之间没有显著差异。结果表明，DCD儿童在应对感觉输入改变时遇到更多困难，而且这种困难更可能是由于感觉组织缺陷而非个体感觉系统有效性受损所致。
