Département des Sciences de l'Activité Physique, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada.
J Electromyogr Kinesiol. 2011 Oct;21(5):774-81. doi: 10.1016/j.jelekin.2011.05.004.
Studies of electromyographic (EMG) activity and lumbopelvic rhythm have led to a better understanding of neuromuscular alterations in chronic low back pain (cLBP) patients. Whether these changes reflect adaptations to chronic pain or are induced by acute pain is still unclear. This work aimed to assess the effects of experimental LBP on lumbar erector spinae (LES) EMG activity and lumbopelvic kinematics during a trunk flexion-extension task in healthy volunteers and LBP patients. The contribution of disability to these effects was also examined. Twelve healthy participants and 14 cLBP patients performed flexion-extension tasks in three conditions; control, innocuous heat and noxious heat, applied on the skin over L5 or T7. The results indicated that noxious heat at L5 evoked specific increases in LES activity during static full trunk flexion and extension, irrespective of participants' group. Kinematic data suggested that LBP patients adopted a different movement strategy than controls when noxious heat was applied at the L5 level. Besides, high disability was associated with less kinematic changes when approaching and leaving full flexion. These results indicate that experimental pain can induce neuromechanical alterations in cLBP patients and healthy volunteers, and that higher disability in patients is associated with decreased movement pattern changes.
肌电图（EMG）活动和腰骶节律的研究使人们对慢性下腰痛（cLBP）患者的神经肌肉变化有了更好的理解。这些变化是对慢性疼痛的适应，还是由急性疼痛引起的，目前仍不清楚。本研究旨在评估实验性下腰痛对健康志愿者和 cLBP 患者在进行躯干屈伸任务时腰椎竖脊肌（LES）EMG 活动和腰骶运动学的影响，并检查残疾对这些影响的贡献。12 名健康参与者和 14 名慢性腰痛患者在三种条件下进行屈伸任务：对照、无害热和有害热，施加在 L5 或 T7 皮肤表面。结果表明，无论参与者的组别如何，L5 的有害热在静态全躯干屈伸时都会引起 LES 活动的特定增加。运动学数据表明，当 L5 水平施加有害热时，cLBP 患者比对照组采用了不同的运动策略。此外，当接近和离开全屈时，高残疾与运动模式变化减少相关。这些结果表明，实验性疼痛会在 cLBP 患者和健康志愿者中引起神经力学改变，而患者的高残疾与运动模式变化减少相关。
