Blomqvist Sven, Wester Anita, Rehn Börje
Swedish Development Centre for Disability Sport, Bollnäs, Sweden; Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå, Sweden.
Department of Research and Evaluation, Swedish National Agency for Education, Stockholm, Sweden.
Gait Posture. 2014 Mar;39(3):904-8. doi: 10.1016/j.gaitpost.2013.11.018. Epub 2013 Dec 5.
This study examines postural muscle responses to backward perturbations in young people (16-20 years) with and without intellectual disability (ID). The study included 56 young people with ID and 43 age-matched without ID volunteers. The subjects stood on a platform that was moved backwards in a surface translation. Lower and upper leg muscles and lower back spine muscles were recorded with surface electromyography (EMG). Muscle onset latency, time to peak amplitude (EMG), adaptation of muscle responses to repeated perturbations (using integrated EMG (IEMG) for epochs), and synergies and strategies were assessed. The result showed no differences between the two groups in muscle onset latency, synergies, and strategies. Young people with ID reduced their time to peak amplitude in investigated muscles, a response that was different from the group without ID. Also, young people with ID tended to adapt their IEMG less compared to the controls. These findings suggest that young people with ID have limited ability to use somatosensory information and adapt their postural muscle responses to repeated external perturbations.
本研究考察了有和没有智力障碍（ID）的年轻人（16至20岁）在受到向后扰动时的姿势肌肉反应。该研究纳入了56名患有ID的年轻人和43名年龄匹配的无ID志愿者。受试者站在一个在表面平移中向后移动的平台上。使用表面肌电图（EMG）记录小腿和大腿肌肉以及下背部脊柱肌肉。评估肌肉起始潜伏期、达到峰值振幅的时间（EMG）、肌肉对重复扰动的反应适应性（使用各时段的积分肌电图（IEMG））以及协同作用和策略。结果显示，两组在肌肉起始潜伏期、协同作用和策略方面没有差异。患有ID的年轻人在被研究肌肉中达到峰值振幅的时间缩短，这一反应与无ID组不同。此外，与对照组相比，患有ID的年轻人对其IEMG的适应性往往较低。这些发现表明，患有ID的年轻人利用体感信息并使姿势肌肉反应适应重复外部扰动的能力有限。
