Nwaobi O M, Brubaker C E, Cusick B, Sussman M D
Dev Med Child Neurol. 1983 Apr;25(2):175-83. doi: 10.1111/j.1469-8749.1983.tb13741.x.
This study was designed to determine whether tonic myoelectric activity of low-back extensors of spastic cerebral-palsied children changed in response to changes in seating position, and if so, which position was coincident with the least extensor activity. Using two pairs of surface electrodes, the electrical activity of the lumbar erector spinae muscles was monitored in seven combinations of backrest inclinations (75 degrees, 90 degrees, 105 degrees and 120 degrees) and seat surface elevations (0 degrees and 15 degrees). Off-line analysis of action potential counts per second of recorded electromyographic signals showed that electrical activity was least when the seat surface elevation was 0 degrees and the backrest inclination 75 degrees. The results showed that differences existed in the activity of the low-back extensors in the seating positions that were assessed.
本研究旨在确定痉挛型脑瘫儿童腰背部伸肌的强直性肌电活动是否会随着坐姿的改变而变化，若有变化，哪种姿势下伸肌活动最少。使用两对表面电极，在靠背倾斜度（75度、90度、105度和120度）和座椅表面高度（0度和15度）的七种组合下监测腰竖脊肌的电活动。对记录的肌电信号每秒的动作电位计数进行离线分析，结果显示当座椅表面高度为0度且靠背倾斜度为75度时，电活动最少。结果表明，在所评估的坐姿中，腰背部伸肌的活动存在差异。
