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首页> 外文期刊>Journal of Neurophysiology >Single-motor-unit discharge characteristics in lumbar multifidus muscle of acute low back pain patients
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Single-motor-unit discharge characteristics in lumbar multifidus muscle of acute low back pain patients

机译：急性低腰疼痛患者腰部腰部肌肉的单电机单元放电特性

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Acute low back pain (ALBP) causes rapid deterioration of paraspinal muscle function. The underlying neurophysiology is poorly understood. We therefore carried out this observational study in patients with ALBP to characterize motor unit (MU) activity in deep lumbar multifidus (LM) muscle and compare with our previous findings from pain-free subjects. Nine subjects (1 woman; age 26-59 yr) with ALBP duration of 1-21 days were recruited from outpatient clinics. Fine wire electromyography (EMG) electrodes were implanted bilaterally at the painful spinal level under computer tomography guidance. EMG was recorded during spontaneous sitting and standing, and during voluntary force production. Linear mixed models were utilized to test or control for the effects of a number of predefined variables. Compared with sitting, standing increased total duration of EMG activity, median MU discharge rate, interspike interval variability, and common drive measured as common drive coefficients (CDC) derived from concurrently active MU pairs. Median discharge rate in 73 MUs was 5.5 and 6.6 pulses per second (pps) during spontaneous sitting and standing, and 7.2 pps during voluntary force production. Interspike interval variability was lower during voluntary tasks than during spontaneous force production. Common drive was less pronounced in bilateral vs. unilateral unit pairs, also in spontaneous standing. This difference was not seen in our previous pain-free subjects, suggesting altered bilateral control of the spine in ALBP. The distribution of CDC values was not a homogeneous continuum but could be seen as two partially overlapping populations of CDC distributions.
机译：急性低腰疼痛（ALBP）导致肩胛骨功能的快速恶化。潜在的神经生理学知之甚少。因此，我们对血症患者进行了这种观察性研究，以表征深腰部多法（LM）肌肉中的运动单元（MU）活性，并与我们以前的无痛科目的发现进行比较。从门诊诊所招募了九个受试者（1名女性;年龄26-59岁），均为1-21天的血症患者。在计算机断层扫描指导下，细线肌电图（EMG）电极在疼痛的脊柱水平下植入双侧。 EMG在自发坐着和站立期间记录，在志愿部队生产过程中。线性混合模型用于测试或控制许多预定变量的效果。与坐着相比，站立增加了EMG活动的总持续时间，中值μ放电速率，间隙间隔可变性和作为从同时活动的MU对的常见驱动系数（CDC）测量的常见驱动。在自发坐姿和站立期间，73毫升中的中位放电率为5.5和6.6脉冲（PPS），在自愿部队生产过程中为7.2个PPS。自愿任务期间的间隙间隔变量比在自发性力的生产过程中较低。在双边与单侧单位对中，共同的驱动器不太明显，也在自发地位。在我们以前的无痛苦的科目中没有看到这种差异，表明在橡胶中改变了对血管的双侧控制。 CDC值的分布不是均匀的连续体，但可以被视为CDC分布的两个部分重叠的群体。

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