Lafond Danik, Champagne Annick, Descarreaux Martin, Dubois Jean-Daniel, Prado Janina M, Duarte Marcos
Département des sciences de l'activité physique, Université du Québec à Trois-Rivières, Québec, Canada.
Gait Posture. 2009 Apr;29(3):421-7. doi: 10.1016/j.gaitpost.2008.10.064. Epub 2008 Dec 11.
Prolonged standing has been associated with the onset of low back pain symptoms in working populations. So far, it is unknown how individuals with chronic low back pain (CLBP) behave during prolonged unconstrained standing (PS). The aim of the present study was to analyze the control of posture by subjects with CLBP during PS in comparison to matched healthy adults. The center of pressure (COP) position of 12 CLBP subjects and 12 matched healthy controls was recorded in prolonged standing (30min) and quiet stance tasks (60s) on a force plate. The number and amplitude of COP patterns, the root mean square (RMS), speed, and frequency of COP sway were analyzed. Statistical analyses showed that CLBP subjects produced less postural changes in the antero-posterior direction with decreased postural sway during the prolonged standing task in comparison to the healthy group. Only CLBP subjects were influenced by the prolonged standing task, as demonstrated by their increased COP RMS, COP speed and COP frequency in the quiet standing trial after the prolonged standing task in comparison to the pre-PS trial. The present study provides additional evidence that individuals with CLBP might have altered sensory-motor function. Their inability to generate responses similar to those of healthy subjects during prolonged standing may contribute to CLBP persistence or an increase risk of recurrent back pain episodes. Moreover, quantification of postural changes during prolonged standing could be useful to identify CLBP subjects prone to postural control deficits.
长时间站立与工作人群中腰痛症状的发作有关。到目前为止，尚不清楚慢性腰痛（CLBP）患者在长时间无约束站立（PS）期间的行为表现。本研究的目的是分析CLBP患者在PS期间的姿势控制情况，并与匹配的健康成年人进行比较。在测力板上，对12名CLBP患者和12名匹配的健康对照者进行长时间站立（30分钟）和安静站立任务（60秒）时的压力中心（COP）位置进行记录。分析了COP模式的数量和幅度、COP摆动的均方根（RMS）、速度和频率。统计分析表明，与健康组相比，CLBP患者在长时间站立任务期间前后方向的姿势变化较少，姿势摆动减少。只有CLBP患者受到长时间站立任务的影响，与PS前试验相比，在长时间站立任务后的安静站立试验中，他们的COP RMS、COP速度和COP频率增加就证明了这一点。本研究提供了额外的证据，表明CLBP患者可能存在感觉运动功能改变。他们在长时间站立期间无法产生与健康受试者类似的反应，可能导致CLBP持续存在或复发性背痛发作风险增加。此外，长时间站立期间姿势变化的量化可能有助于识别容易出现姿势控制缺陷的CLBP患者。
