School of Health and Sport Sciences, University of the Sunshine Coast, Maroochydore, DC, Australia.
Ergonomics. 2013;56(4):659-66. doi: 10.1080/00140139.2012.760755. Epub 2013 Mar 18.
The purpose of this study was to investigate the interrelationship between the thorax and pelvis during coupled movement patterns. Fifty-seven participants were assessed using an infrared motion analysis system to track trunk movement during maximal pelvis and thorax rotations over four trunk inclinations and two pelvic constraint conditions. A repeated-measures multivariate analysis of variance investigated the effects of forward trunk inclination and pelvic constraint on thorax and pelvic rotation. Forward trunk inclination from neutral to 45° resulted in a 46% (p < 0.001) decrease in axial pelvic rotation and a 15% (p < 0.001) decrease in axial thorax rotation with an unconstrained pelvis. A constrained pelvis resulted in a 15% (p < 0.001) decrease in axial thorax rotation. An externally constrained pelvis allowed the thorax to achieve an average of 18° (SD = 2°) greater rotational range of motion across all angles. This study reinforced the importance of allowing the pelvis to rotate during whole body axial rotation tasks.
Results indicated that maximum axial trunk rotation is best achieved in a neutral posture, when the pelvis is allowed to contribute and flexion at the hips should be minimised. For example, if a recumbent task requires rotation of the torso, then the chair seat should be allowed to swivel.
本研究旨在探讨在耦合运动模式下胸段和骨盆之间的相互关系。57 名参与者使用红外运动分析系统进行评估，以在四个躯干倾斜度和两种骨盆约束条件下跟踪最大骨盆和胸段旋转过程中的躯干运动。重复测量多元方差分析调查了躯干前倾和骨盆约束对胸段和骨盆旋转的影响。从中立位到 45°前倾，会导致轴向骨盆旋转减少 46%（p < 0.001），轴向胸段旋转减少 15%（p < 0.001），而骨盆不受约束。骨盆受约束会导致轴向胸段旋转减少 15%（p < 0.001）。外部约束骨盆使胸段在所有角度的平均旋转运动范围增加了 18°（SD = 2°）。本研究强调了在全身轴向旋转任务中允许骨盆旋转的重要性。
结果表明，在中立姿势下，最大轴向躯干旋转最容易实现，此时骨盆可以发挥作用，并且应尽量减少髋关节的屈曲。例如，如果需要仰卧位旋转躯干，那么椅子座位应允许旋转。
