Jacobs Jesse V, Henry Sharon M, Nagle Keith J
Department of Rehabilitation and Movement Science, University of Vermont, Burlington, VT 05405, USA.
Behav Neurosci. 2009 Apr;123(2):455-8. doi: 10.1037/a0014479.
Variability in the constituents of movement is fundamental to adaptive motor performance. A sustained decrease in the variability of anticipatory postural adjustments (APAs) occurs when performing cued arm raises following acute, experimentally induced low back pain (LBP; Moseley & Hodges, 2006). This observation implies that these changes in variability may also be relevant to people with chronic LBP. To confirm that this reduced variability in the timing of APAs is also evident in people with chronic LBP, the authors examined the standard deviations of electromyographic onset latencies from the bilateral internal oblique (IO) and erector spinae muscles (in relation to deltoid muscle onset) when 10 people with chronic LBP and 10 people without LBP performed 75 trials of rapid arm raises. The participants with LBP exhibited significantly less variability of their IO muscle onset latencies, confirming that the decreased variability of postural coordination that is evident following acutely induced LBP is also evident in people with chronic LBP. Thus, people with chronic LBP may be less capable of adapting their APAs to ensure postural stability during movement.
运动成分的变异性是适应性运动表现的基础。在急性实验性诱发的下背痛（LBP；莫斯利和霍奇斯，2006年）后进行提示性手臂上举时，预期姿势调整（APA）的变异性会持续降低。这一观察结果表明，这些变异性的变化可能也与慢性下背痛患者有关。为了证实APA时间的这种变异性降低在慢性下背痛患者中也很明显，作者检查了10名慢性下背痛患者和10名无下背痛患者进行75次快速手臂上举试验时，双侧腹内斜肌（IO）和竖脊肌肌电图起始潜伏期的标准差（相对于三角肌起始）。慢性下背痛患者的IO肌起始潜伏期变异性显著降低，证实了急性诱发下背痛后明显的姿势协调性变异性降低在慢性下背痛患者中也很明显。因此，慢性下背痛患者在运动过程中可能较难调整其APA以确保姿势稳定性。
