Roy S H, De Luca C J, Casavant D A
NeuroMuscular Research Center, Boston University, Massachusetts.
Spine (Phila Pa 1976). 1989 Sep;14(9):992-1001. doi: 10.1097/00007632-198909000-00014.
There currently is a clinical need for an objective technique to assess muscle dysfunction associated with chronic lower back pain. A Back Analysis System for objectively measuring local fatigue in the back extensor muscles is presented. The reliability and validity of this technique was evaluated by testing chronic low-back pain patients and control subjects without back pain. Concurrent surface electromyograms (EMG) were detected from multiple back muscles during sustained isometric contractions at different force levels of trunk extension. Median frequency parameters of the EMG power density spectrum were monitored to quantify localized muscle fatigue. Results indicated: 1) high reliability estimates for repeated trials; 2) significant differences (P less than 0.05) in median frequency parameters between lower back pain patients and control subjects for specific combinations of contractile force level and muscle site tested; 3) Median Frequency parameters correctly classified lower back pain and control subjects using a two-group discriminant analysis procedure. The applicability of this technique as a treatment outcome measure and diagnostic screening method for lower back pain patients is discussed.
目前临床上需要一种客观的技术来评估与慢性下背痛相关的肌肉功能障碍。本文介绍了一种用于客观测量背部伸肌局部疲劳的背部分析系统。通过对慢性下背痛患者和无背痛的对照受试者进行测试，评估了该技术的可靠性和有效性。在不同力水平的躯干伸展等长收缩过程中，从多个背部肌肉检测同步表面肌电图（EMG）。监测EMG功率密度谱的中位频率参数以量化局部肌肉疲劳。结果表明：1）重复试验的可靠性估计值较高；2）在特定的收缩力水平和测试肌肉部位组合下，下背痛患者和对照受试者的中位频率参数存在显著差异（P<0.05）；3）使用两组判别分析程序，中位频率参数能正确区分下背痛患者和对照受试者。本文还讨论了该技术作为下背痛患者治疗效果测量和诊断筛查方法的适用性。
