Pavlova Anastasia V, Meakin Judith R, Cooper Kay, Barr Rebecca J, Aspden Richard M
Arthritis and Musculoskeletal Medicine, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK.
Biophysics Research Group, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK.
BMJ Open Sport Exerc Med. 2018 Jul 15;4(1):e000374. doi: 10.1136/bmjsem-2018-000374. eCollection 2018.
Lifting postures are frequently implicated in back pain. We previously related responses to a static load with intrinsic spine shape, and here we investigate the role of lumbar spine shape in lifting kinematics.
Thirty healthy adults (18-65 years) performed , and lifts with a weighted box (6-15 kg, self-selected) while being recorded by Vicon motion capture. Internal spine shape was characterised using statistical shape modelling (SSM) from standing mid-sagittal MRIs. Associations were investigated between spine shapes quantified by SSM and peak flexion angles.
Two SSM modes described variations in overall lumbar curvature (mode 1 (M1), 55% variance) and the evenness of curvature distribution (mode 2 (M2), 12% variance). M1 was associated with greater peak pelvis (r=0.38, p=0.04) and smaller knee flexion (r=-0.40, p=0.03) angles; individuals with greater curviness preferred to lift with a stooped lifting posture. This was confirmed by analysis of those individuals with very curvy or very straight spines (|M1|>1 SD). There were no associations between peak flexion angles and mode scores in or trials (p>0.05). Peak flexion angles were positively correlated between and trials but not between and or and , indicating that individuals adjusted knee flexion while maintaining their preferred range of lumbar flexion and that 'squatters' adapted better to different techniques than 'stoopers'.
Spinal curvature affects preferred lifting styles, and individuals with curvier spines adapt more easily to different lifting techniques. Lifting tasks may need to be tailored to an individual's lumbar spine shape.
提举姿势常与背痛相关。我们之前将对静态负荷的反应与脊柱固有形状联系起来，在此我们研究腰椎形状在提举运动学中的作用。
30名健康成年人（18 - 65岁）使用一个加权箱（6 - 15千克，自行选择）进行、和提举动作，同时由Vicon运动捕捉系统进行记录。利用站立位正中矢状面MRI通过统计形状建模（SSM）对脊柱内部形状进行表征。研究通过SSM量化的脊柱形状与峰值屈曲角度之间的关联。
两种SSM模式描述了腰椎整体曲率的变化（模式1（M1），方差55%）和曲率分布的均匀性（模式2（M2），方差12%）。M1与更大的骨盆峰值（r = 0.38，p = 0.04）和更小的膝关节屈曲（r = -0.40，p = 0.03）角度相关；脊柱更弯曲的个体更喜欢以弯腰的提举姿势进行提举。对脊柱非常弯曲或非常笔直（|M1|>1标准差）的个体进行的分析证实了这一点。在或试验中，峰值屈曲角度与模式得分之间无关联（p>0.05）。峰值屈曲角度在和试验之间呈正相关，但在和或和试验之间无相关性，这表明个体在保持其偏好的腰椎屈曲范围的同时调整膝关节屈曲，并且“蹲举者”比“弯腰者”更能适应不同的技术。
脊柱曲率影响偏好的提举方式，脊柱更弯曲的个体更容易适应不同提举技术。提举任务可能需要根据个体的腰椎形状进行调整。
