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首页> 外文期刊>BMC Musculoskeletal Disorders >Investigating differences in trunk muscle activity in non-specific chronic low back pain subgroups and no-low back pain controls during functional tasks: a case-control study
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Investigating differences in trunk muscle activity in non-specific chronic low back pain subgroups and no-low back pain controls during functional tasks: a case-control study

机译：调查功能性任务期间非特异性慢性下腰痛亚组和无下腰痛的控制者躯干肌肉活动的差异：病例对照研究

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Trunk muscle dysfunction is often regarded as a key feature of non-specific chronic low back pain (NSCLBP) despite being poorly understood and variable with increases, decreases and no change in muscle activity reported. Differences in thoraco-lumbar kinematics have been observed in motor control impairment NSCLBP subgroups (Flexion Pattern, Active Extension Pattern) during static postures and dynamic activities. However, potential differences in muscle activity during functional tasks has not been established in these subgroups to date. A case-control study design recruited 50 NSCLBP subjects (27 Flexion Pattern, 23 Active Extension Pattern) and 28 healthy individuals. Surface electromyography determined muscle activity during functional tasks: reaching upwards, step-down, step-up, lifting and replacing a box, stand-to-sit, sit-to-stand, bending to retrieve (and returning from retrieving) a pen from the floor. Normalised (% sub-maximal voluntary contraction) mean amplitude electromyography of bilateral musculature (transversus abdominis/internal oblique, external oblique, superficial lumbar multifidus and longissimus thoracis) was analysed using Kruskal-Wallis and post-hoc Mann-Whitney U tests. Transversus abdominis/internal oblique activity was significantly increased in the Flexion Pattern group compared to controls during stand-to-sit (p?=?0.009) on the left side only. External oblique activity was significantly greater in the Active Extension Pattern group compared to controls during box lift (p?=?0.016) on the right side only. Significantly greater activity was identified in the right Superficial lumbar multifidus during step up (p?=?0.029), reach up (p?=?0.013) and box replace (p?=?0.007) in the Active Extension Pattern group compared to controls. However left-sided superficial lumbar multifidus activity was significantly greater in the Flexion Pattern group (compared to controls) only during stand-to-sit (p?=?0.009). No significant differences were observed in longissimus thoracis activity bilaterally during any task. No significant differences between NSCLBP subgroups were observed. Muscle activity in these NSCLBP subgroups appears to be highly variable during functional tasks with no clear pattern of activity identified. The findings reflect inconsistencies and variability in trunk muscle activity previously observed in these NSCLBP subgroups. Further work evaluating ratios of muscle activity and changes in muscle activity throughout task duration is warranted.
机译：躯干肌功能障碍通常被认为是非特异性慢性下腰痛（NSCLBP）的关键特征，尽管了解不多，并且随肌肉活动的增加，减少和变化而有所变化。在静态姿势和动态活动期间，在运动控制受损的NSCLBP子组（屈曲模式，主动伸展模式）中观察到了胸腰运动学的差异。但是，到目前为止，在这些亚组中尚未确定功能性任务期间肌肉活动的潜在差异。病例对照研究设计招募了50名NSCLBP受试者（27屈曲模式，23主动延伸模式）和28位健康个体。表面肌电图确定了功能任务期间的肌肉活动：向上，向下，向上，提起和更换盒子，站立坐着，坐着站立，弯曲以从中取回（并从取回中返回）笔地上。使用Kruskal-Wallis和事后Mann-Whitney U检验分析了双侧肌肉组织的标准化（最大次自愿收缩百分比）平均肌电图（横腹/内斜肌，内斜肌，外斜肌，浅表腰椎多裂症和胸大肌）。在屈曲模式组中，与坐位相比，腹横肌/腹内斜肌活动比对照组明显增加（p = 0.009）。在活动扩展模式组中，外部斜向活动比仅在右侧抬起箱时的对照组要大得多（p≥0.016）。与对照组相比，活动性扩展型组中右侧腰浅部多发性抬高（p？=？0.029），抬高（p？=？0.013）和盒子替换（p？=？0.007）的活动明显增强。 。然而，仅在站立站立时，屈曲模式组（与对照组相比）左侧浅表腰椎多裂活动明显增加（p = 0.009）。在任何任务期间，双侧胸大肌活动均未观察到明显差异。在NSCLBP亚组之间未观察到显着差异。在功能性任务期间，这些NSCLBP亚组的肌肉活动似乎高度可变，没有明确的活动模式。这些发现反映了先前在这些NSCLBP亚组中观察到的躯干肌肉活动的不一致和变异性。必须进行进一步的工作来评估整个任务期间的肌肉活动比率和肌肉活动变化。

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