Rodriguez A A, Agre J C
Department of Rehabilitation Medicine, University of Wisconsin-Madison Medical School 53792.
Muscle Nerve. 1991 May;14(5):429-34. doi: 10.1002/mus.880140508.
The purpose of this study was to determine whether quantitative motor unit analysis in postpolio individuals correlates with muscle strength, endurance, work capacity, or power spectral characteristics of surface EMG and to determine whether power spectrum differentiates postpolio from control subjects. This study was designed to compare these variables in 34 symptomatic postpolio, 16 asymptomatic postpolio, and 41 control subjects. Quantitative motor unit analysis of the quadriceps femoris muscle was performed using a concentric needle electrode. Isometric knee extension peak torque, endurance (time to exhaustion) at 40% of maximal torque, work capacity (tension time index), and recovery of force through 10 minutes post-exhaustion were determined. Median frequency of the surface power spectrum was determined during the above testing. Power spectrum histograms were compared at the onset and termination of endurance exercise. Motor unit action potential variables did not correlate with isometric peak torque, tension time index, endurance time, recovery of strength, or with median frequency. Surface power spectrum did not differentiate postpolio from control subjects.
本研究的目的是确定小儿麻痹症患者的定量运动单位分析是否与肌肉力量、耐力、工作能力或表面肌电图的功率谱特征相关，以及功率谱是否能区分小儿麻痹症患者和对照受试者。本研究旨在比较34例有症状的小儿麻痹症患者、16例无症状的小儿麻痹症患者和41例对照受试者的这些变量。使用同心针电极对股四头肌进行定量运动单位分析。测定等长伸膝峰值扭矩、最大扭矩40%时的耐力（疲劳时间）、工作能力（张力时间指数）以及疲劳后10分钟内的力量恢复情况。在上述测试过程中测定表面功率谱的中位数频率。比较耐力运动开始和结束时的功率谱直方图。运动单位动作电位变量与等长峰值扭矩、张力时间指数、耐力时间、力量恢复或中位数频率均无相关性。表面功率谱无法区分小儿麻痹症患者和对照受试者。
