Background/objectives: Sedentary office workers (SOWs) often adopt prolonged sitting postures, which potentially disrupt the lumbar-pelvic rhythm (LPR) and contribute to lower back pain (LBP). This study aimed to clarify the group differences in LPR and related physical factors between SOWs with and without LBP.

Methods: Sixty-three SOWs were divided into LBP (n = 30) and non-LBP (n = 33) groups. The lumbar flexion angle (LF) and lumbar-hip angle difference (LHD), which are indicators of LPR, were measured using inertial sensors during trunk flexion. Hip flexion muscle strength (HFMS) and hip-extension muscle strength (HEMS) were assessed using handheld dynamometry. Hip joint range of motion (ROM) was measured using a goniometer. Lumbar proprioception was evaluated via active joint repositioning, and pain and perception were assessed using the Visual Analog Scale, Oswestry Disability Index, and Fremantle Back Awareness Questionnaire.

Results: Multiple regression analysis showed significantly greater LF (estimated regression coefficient [ERC]: -2.9, p < 0.05) and LHD (ERC: -5.5, p < 0.05) during early trunk flexion (ETF) in the LBP group. In the LBP group, LHD during ETF and late trunk flexion were positively correlated with HFMS, and HFMS was correlated with HEMS.

Conclusions: HFMS may contribute to an altered LPR in SOWs with LBP.

Keywords: low back pain; lumbar–pelvic rhythm; sedentary office workers.

背景/目的：久坐办公人员（SOWs）常常采取长时间的坐姿，这可能会扰乱腰椎-骨盆节律（LPR），并导致下背部疼痛（LBP）。本研究旨在澄清有和无LBP的SOWs在LPR及相关身体因素方面的组间差异。

方法：六十名SOWs被分为患有LBP (n = 30) 和无LBP (n = 33) 的两组。使用惯性传感器在躯干前屈时测量腰椎前屈角度（LF）和腰-髋角差值（LHD），它们是LPR的指标。通过手持式测力计评估髋关节屈肌力量（HFMS）和伸髋肌力量（HEMS）。使用量角器测量髋关节活动范围（ROM）。通过主动关节再定位测试评价腰部本体感觉，使用视觉模拟评分、Oswestry功能障碍指数和Fremantle背痛感知问卷评估疼痛及感知。

结果：多元回归分析显示，在早期躯干前屈（ETF）时，LBP组的LF（估计回归系数 [ERC]：-2.9, p p

结论：髋关节屈肌力量可能会影响有LBP的SOWs的腰椎-骨盆节律变化。

关键词：下背部疼痛；腰椎-骨盆节律；久坐办公人员。