Nishi Yuki, Nobusako Satoshi, Tsujimoto Taeko, Sakai Ayami, Nakai Akio, Morioka Shu
Neurorehabilitation Research Center, Kio University, Koryo, Kitatkatsuragi-gun, Nara 635-0832, Japan.
Department of Rehabilitation Medicine, Kanmaki, Kitatkatsuragi-gun, Nishiyamato Rehabilitation Hospital, Nara 639-0218, Japan.
Brain Sci. 2022 May 4;12(5):598. doi: 10.3390/brainsci12050598.
Although children with developmental coordination disorder (DCD) show impaired precision grip control due to a sensory-motor integration deficit, their spatial instability (such as changes in force direction and object roll during a precision grip task) is unclear. Herein, we investigated the spatial instability in the precision grip force control of children with poor manual dexterity. We divided 66 school-aged children who performed a precision gripping and lifting of heavy- or lightweight objects into those with low manual dexterity ( = 11) and those with high manual dexterity ( = 55) as revealed by the Movement Assessment Battery for Children (2nd edition). The group and weight effects were then determined. The results revealed that the total trajectory lengths of the center of pressure (COP) were longer in the lightweight object data of the children in the low-manual-dexterity group and were related to the children's grip force. The low-manual-dexterity group also showed a shifted COP position from the center of the object in the medial-lateral direction and in the object roll regardless of the object's weight; these were closely related in both weights' tests. These results demonstrated that children with poor manual dexterity show spatial instability and different adaptations to the weight of objects during a precision grip task. Further studies are needed to determine whether these findings would be replicated in children with a diagnosis of DCD.
尽管患有发育性协调障碍(DCD)的儿童由于感觉运动整合缺陷而表现出精细抓握控制受损,但其空间不稳定性(如在精细抓握任务中力的方向变化和物体滚动)尚不清楚。在此,我们研究了手部灵活性较差的儿童在精细抓握力控制中的空间不稳定性。我们将66名进行轻重物体精细抓握和提起的学龄儿童,根据儿童运动评估量表(第2版)的结果,分为手部灵活性低的儿童(n = 11)和手部灵活性高的儿童(n = 55)。然后确定组间效应和重量效应。结果显示,手部灵活性低的儿童在轻物体数据中的压力中心(COP)总轨迹长度更长,且与儿童的握力有关。手部灵活性低的组在物体重量不同时,其COP位置在内外侧方向和物体滚动方面均偏离物体中心;在两种重量测试中,这些情况都密切相关。这些结果表明,手部灵活性较差的儿童在精细抓握任务中表现出空间不稳定性以及对物体重量的不同适应性。需要进一步研究以确定这些发现是否能在被诊断为DCD的儿童中得到重复。