Department of Kinesiology, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada.
Gait Posture. 2011 Oct;34(4):490-5. doi: 10.1016/j.gaitpost.2011.06.025. Epub 2011 Jul 29.
Previous literature has shown that individuals can develop transient low back pain (LBP) during a 2-h bout of unconstrained prolonged standing. The purpose of this study was to investigate the postural changes of individuals who develop LBP during standing (PD) and those who do not (NPD). Forty-one subjects (20 male, 21 female) participated in a 2-h prolonged standing occupational simulation and recorded their ratings of perceived LBP on a visual analog scale (VAS). Center of pressure changes (shifts, drifts, and fidgets) and body weight shifts were determined for each subject. All subjects showed an increase in the BW shift frequency and a decrease in average shift duration over the 2-h protocol. All NPD and female PD were consistent for many of the variables; however, male PD did not show similar patterns to the other groups, especially for anterior-posterior (AP) shift amplitude and total body weight asymmetry. Although gender differences between the pain groups were found, PD and NPD do not use different postural changes during unconstrained standing, showing that changes to postural control may be an "adaptive", rather than "causative" response to their LBP development. Future works should concentrate on bridging the literature seen in quiet standing before and after prolonged standing and the response of PD, as well as the effect of an exercise intervention on postural control, especially for male PD.
先前的文献表明，个体在 2 小时无约束长时间站立期间可能会出现短暂性腰痛（LBP）。本研究的目的是调查在站立期间出现腰痛（PD）和未出现腰痛（NPD）的个体的姿势变化。41 名受试者（20 名男性，21 名女性）参与了 2 小时的长时间站立职业模拟，并使用视觉模拟量表（VAS）记录他们对腰痛的感知评分。为每位受试者确定了压力中心的变化（移位、漂移和烦躁）和体重转移。所有受试者在 2 小时的方案中，BW 转移频率增加，平均转移持续时间减少。所有 NPD 和女性 PD 在许多变量上都是一致的；然而，男性 PD 并没有表现出与其他组相似的模式，尤其是在前-后（AP）移位幅度和总体重不对称方面。尽管在疼痛组之间发现了性别差异，但 PD 和 NPD 在无约束站立期间并没有使用不同的姿势变化，这表明姿势控制的变化可能是对其腰痛发展的一种“适应性”而不是“因果性”反应。未来的工作应集中在弥合长时间站立前后安静站立文献与 PD 反应之间的差距，以及锻炼干预对姿势控制的影响，特别是对男性 PD 的影响。
