Roessingh Research and Development, Roessinghsbleekweg 33b, Enschede, The Netherlands.
J Electromyogr Kinesiol. 2010 Feb;20(1):31-8. doi: 10.1016/j.jelekin.2009.03.009.
It has been hypothesized that changes in trunk muscle activity in chronic low back pain (CLBP) reflect an underlying "guarding" mechanism, which will manifest itself as increased superficial abdominal - and lumbar muscle activity. During a functional task like walking, it may be further provoked at higher walking velocities. The purpose of this cross sectional study was to investigate whether subjects with CLBP show increased co-activation of superficial abdominal - and lumbar muscles during walking on a treadmill, when compared to asymptomatic controls. Sixty-three subjects with CLBP and 33 asymptomatic controls walked on a treadmill at different velocities. Surface electromyography data of the erector spinae, rectus abdominis and obliquus abdominis externus muscles were obtained and averaged per stride. Results show that, compared to asymptomatic controls, subjects with CLBP have increased muscle activity of the erector spinae and rectus abdominis, but not of the obliquus abdominis externus. These differences in trunk muscle activity between groups do not increase with higher walking velocities. In conclusion, the observed increased trunk muscle activity in subjects with CLBP during walking supports the guarding hypothesis.
人们假设，慢性下背痛（CLBP）患者躯干肌肉活动的变化反映了一种潜在的“保护”机制，这种机制表现为腹前壁和腰背部肌肉活动增加。在像步行这样的功能任务中，当行走速度增加时，这种情况可能会进一步加剧。本横断面研究的目的是调查与无症状对照组相比，CLBP 患者在跑步机上行走时，是否会出现腹前壁和腰背部肌肉的协同活动增加。63 名 CLBP 患者和 33 名无症状对照组在不同速度下在跑步机上行走。获得竖脊肌、腹直肌和腹外斜肌的表面肌电图数据，并对每一步进行平均。结果表明，与无症状对照组相比，CLBP 患者的竖脊肌和腹直肌活动增加，但腹外斜肌活动没有增加。两组间躯干肌肉活动的这些差异不会随行走速度的增加而增加。总之，在步行过程中观察到的 CLBP 患者躯干肌肉活动增加支持了保护假说。
