Takahashi Ichiro, Kikuchi Shin-ichi, Sato Katsuhiko, Iwabuchi Masumi
Department of Orthopaedic Surgery, Fukushima Medical University, School of Medicine, Fukushima, Japan.
Spine (Phila Pa 1976). 2007 Jan 15;32(2):E73-8. doi: 10.1097/01.brs.0000252203.16357.9a.
Postural changes and trunk muscle activities were examined in patients with motion-induced intermittent low back pain (MILBP) and healthy controls.
To assess the ability to maintain an upright standing position.
Since MILBP is not observed at rest, its pathophysiology is complicated to investigate. METHODS.: Postural changes were measured with a 3-dimensional motion analyzer, and muscle activities with a surface electromyography while 10 female patients at an average age of 76 years (MILBP group) and 10 healthy controls at an average age of 74 years (Control Group) were standing upright and loaded with 10-kg weights.
In the Control Group, no significant forward bending motion occurred. In the MILBP group, there was a temporal increase in forward bending at various speeds and at various time phases. In the MILBP group but not in the Control Group, the rate of changes in median power frequency of erector spinae muscle declined significantly as compared with that in the Control Group (P < 0.05).
These results indicated that fatigue of the back muscles occurred in MILBP patients and could be a pain generator in low back pain.
对运动诱发的间歇性下腰痛（MILBP）患者和健康对照者的姿势变化及躯干肌肉活动进行了检查。
评估保持直立站立姿势的能力。
由于MILBP在休息时未被观察到，其病理生理学难以研究。方法：在10名平均年龄76岁的女性患者（MILBP组）和10名平均年龄74岁的健康对照者（对照组）直立并负重10千克时，用三维运动分析仪测量姿势变化，用表面肌电图测量肌肉活动。
在对照组中，未发生明显的向前弯曲运动。在MILBP组中，在不同速度和不同时间阶段向前弯曲有暂时性增加。与对照组相比，MILBP组但非对照组竖脊肌中位功率频率的变化率显著下降（P<0.05）。
这些结果表明，MILBP患者出现了背部肌肉疲劳，这可能是下腰痛的疼痛产生源。
