慢性下腰痛患者腰部肌肉放电的均衡性

Proportionality of lumbar muscle discharge in patients with chronic low back pain

目的:观察慢性下腰痛患者腰部肌肉放电的均衡性。方法:实验于2007-05在沈阳体育学院重点实验室完成。以14名健康受试者和14名慢性下腰痛患者为观察对象,让其在静力性收缩的条件下观察腰部肌肉放电的情况。使用表面肌电技术测量受试者腰部3个节段(L1,L2,L5)两侧最长肌、髂腰肋肌、多裂肌的放电情况,令受试者躯干分别在40%最大随意收缩和80%最大随意收缩的情况做等长收缩30s,观察受试者腰部脊柱两侧肌肉的疲劳时的失衡情况。结果:慢性下腰痛患者腰部肌肉的最大随意收缩仅仅是对照组最大随意收缩的55%,与对照组相比慢性下腰痛患者腰部肌肉疲劳程度较低,可能与他们并没有产生真正的最大随意收缩有关;慢性下腰痛患者腰部两侧肌肉失衡程度较大。结论:下腰痛患者出现疼痛时,其腰部两侧的肌肉活动重新分布;同时表面肌电可能成为一种无创伤地检测肌肉失衡的有效工具。

OBJECTIVE： To observe proportionality of lumbar muscle discharge in patients with chronic low back pain. METHODS： The experiment was performed at Key Laboratory of Shenyang Sport University in May 2007. 14 healthy volunteers and 14 patients with chronic low back pain were involved in the experiment. Under isometric contraction, the activity of Iongissimus, iliocostalis and multifidus at the levels of L1, L2 and L5 were observed by the surface electromyography. After trunk extention at 40% maximum voluntary contraction （MVC） and 80%MVC for 30 seconds, the imbalance of paraspinal muscle was observed. RESULTS： The MVC of patients with chronic low back pain was only 55% that in healthy volunteers. Compared with healthy volunteers, the patients showed less fatigue degree, which may be because the patients did not produce a true MVC. The patients also had higher imbalances in lumbar muscles. CONCLUSION： The presence of pain in these patients caused a redistribution of the activation behavior between synergistic muscles of the lumbar back. The surface electromyography may be a noninvasive method to detect the imbalance of muscle.