Faculty of Engineering, Electrical Engineering Department, Imam Reza International University, Mashhad, Iran.
Faculty of Physical Education and Physiotherapy, Federal University of Uberlândia, Minas Gerais, Brazil.
J Biomech. 2020 May 7;104:109708. doi: 10.1016/j.jbiomech.2020.109708. Epub 2020 Feb 28.
Detecting coordination pattern and coordination variability help us to find how joints organize collaboratively to perform sit-to-stand (STS) under restricted visual input. This experiment aimed to compare the coordination of the trunk, hip, knee, and ankle and its variability between individuals with long- and short-term restricted visual input during STS. Forty-five female children participated in this study, including fifteen congenitally blind (CB) children and 30 healthy children. The healthy children were divided randomly into two groups: one group in which the participants were instructed to keep their eyes open (EO) and another to keep their eyes closed (EC) for 20 min before the test. In the standing phase, CB children had a decreased ankle-knee vector angle on the nondominant (ND) side compared to that of healthy children. In the sagittal plane, a small coefficient-of-correspondences (CoC) was observed at seat-off (hip-trunk CoC on the dominant (D) side and ankle-hip CoC on the ND side) and in the preparation phase (ankle-hip CoC on the ND side and bilateral hip CoC). In the frontal plane (at the end: ankle-knee, in the standing phase: bilateral hip) a high CoC was observed (in the standing phase: knee-trunk CoC on the D side). The EC group had smaller CoCs at initiation event (knee-trunk and bilateral knee CoCs on both sides), the end event (ankle-knee and ankle-hip CoCs on the ND side), and in the standing phase (bilateral hip CoC) in the frontal plane than the other groups. The findings reveal that vector and CoC variables are altered because of long- and short-term restricted visual data and should be a focus in rehabilitation programs.
检测协调模式和协调可变性有助于我们了解关节在受限的视觉输入下如何协同组织进行坐站（STS）。本实验旨在比较长期和短期限制视觉输入的 STS 过程中，个体的躯干、臀部、膝盖和脚踝的协调及其可变性。45 名女性儿童参与了这项研究，包括 15 名先天性失明（CB）儿童和 30 名健康儿童。健康儿童随机分为两组：一组要求参与者睁开眼睛（EO），另一组在测试前 20 分钟闭上眼睛（EC）。在站立阶段，与健康儿童相比，CB 儿童非优势（ND）侧的脚踝-膝盖向量角度减小。在矢状面，在起始阶段（优势侧髋关节-躯干 CoC 和 ND 侧脚踝-髋关节 CoC）和准备阶段（ND 侧脚踝-髋关节 CoC 和双侧髋关节 CoC）观察到小的对应系数（CoC）。在额状面（结束时：脚踝-膝盖，站立阶段：双侧髋关节）观察到高 CoC（站立阶段：优势侧膝盖-躯干 CoC）。EC 组在起始事件（双侧膝关节 CoC）、结束事件（ND 侧脚踝-膝盖和脚踝-髋关节 CoC）和站立阶段（双侧髋关节 CoC）的额状面的 CoC 较小，与其他组相比。这些发现表明，由于长期和短期限制视觉数据，向量和 CoC 变量发生了变化，这应该成为康复计划的重点。
