Precision of trunk movement has commonly been examined by testing relocation accuracy rather than evaluating accuracy of tracking dynamic movement. In this study we used a 3-D motion capture system to provide a novel real-time tracking task to assess trunk motor control at varying movement speeds between people with and without chronic non-specific low back pain (LBP). Eleven asymptomatic volunteers and 15 participants with chronic non-specific LBP performed 12 continuous cycles of trunk flexion–extension following real time visual feedback, during which, trunk motion was measured using eight optoelectronic infrared cameras. Significant time differences between the feedback and actual trunk motion were found between groups (P = 0.001). Both groups had similar variability of tracking accuracy when following the feedback (P > 0.05). However, tracking variability at a slow speed correlated (P = 0.03; r = 0.55) with the Fear-Avoidance Beliefs Questionnaire (FABQ) scores in those with LBP. This study shows that both asymptomatic people and individuals with LBP displayed anticipatory behaviour, however, the response of those with LBP was consistently delayed in tracking the visual feedback compared to the asymptomatic group. Additionally, the extent of variability of tracking accuracy over repeated tracking cycles was associated with the degree of fear of movement in people with LBP.

通常通过测试重定位精度而不是评估跟踪动态运动的精度来检查躯干运动的精度。在这项研究中，我们使用了3-D运动捕捉系统来提供新颖的实时跟踪任务，以评估患有和不患有慢性非特异性下背痛（LBP）的人之间在不同运动速度下的躯干运动控制。11名无症状志愿者和15名患有慢性非特异性LBP的参与者在实时视觉反馈之后连续12个连续的躯干屈伸周期，在此期间，使用8个光电红外摄像机测量了躯干运动。两组之间在反馈和实际躯干运动之间存在明显的时间差异（P = 0.001）。当遵循反馈时，两组的跟踪准确性具有相似的变异性（P  > 0.05）。然而，在 低血压人群中，慢速跟踪的变异性与恐惧避避信念问卷（FABQ）得分相关（P = 0.03； r = 0.55）。这项研究表明，无症状者和有LBP的个体均表现出预期的行为，但是，与无症状者相比，LBP者的反应在跟踪视觉反馈方面一直被延迟。另外，在重复的跟踪周期内跟踪精度的变化程度与LBP患者对运动的恐惧程度有关。