An on-body personal lift augmentation device (PLAD) reduces EMG amplitude of erector spinae during lifting tasks
An on-body personal lift augmentation device (PLAD) reduces EMG amplitude of erector spinae during lifting tasks
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DOI：
10.1016/j.clinbiomech.2005.12.021
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发表时间：
2006-06-01
影响因子：
1.8
通讯作者：
Stevenson, Joan M.
中科院分区：
文献类型：
--
作者：
Abdoli-E, Mohammad;Agnew, Michael J.;Stevenson, Joan M.
背景资料。研制了一种新型的体上个人提举增力装置，用于在重复提举作业中支撑背部肌肉。九名男性受试者参与了这项研究。使用三个FasTrak(TM)单元记录节段的位置和旋转。比较了3种不同的负重(5 kg、15 kg、25 kg)、3种不同的举重方式(弯腰、下蹲、自由)，在有无个人举重辅助装置的情况下，对称举重时左、右胸竖脊肌、腰竖棘肌、外斜肌、腹直肌的标准化积分肌电图，以及腰角峰值、骨盆角度峰值、躯干加速度峰值、负荷加速度峰值的运动学变量。升降辅助装置显著降低了腰部(p=0.001)和胸廓竖脊所需的肌肉力量，而腹部肌肉活动水平没有显著差异。腰椎和胸椎的肌电综合减少量分别为14.4%~27.6%。躯干姿势和加速度的简单测量证实，抬起技术没有导致综合肌电活动降低的差异。当佩戴升降机辅助装置时，没有发现主要的运动学差异，这表明它没有改变这些特定的技术变量。升降辅助装置确实减少了腰椎和胸椎竖直脊椎所需的肌肉力量，而不会对腹部肌肉的活动水平产生不利影响。这种减少可能有助于降低背部损伤复发的风险，或有助于重返工作阶段，特别是在重复性任务中。(C)2006爱思唯尔有限公司。保留所有权利。
Background. A new on-body personal lift augmentation device was developed to support the back muscles during the repetitive lifting task.Methods. Nine male subjects participated in the study. Three Fastrak (TM) units were used to record positions and rotations of the segments. Trunk muscle normalized and integrated electromyography of the left and right thoracic erector spinae, lumbar erector spinae, external obliques, and rectus abdominis, as well as the kinematic variables of peak lumbar angle, peak pelvis angle, peak trunk acceleration, peak load acceleration were compared in symmetrical lifting for three different loads (5 kg, 15 kg, 25 kg) with three different styles (stooped, squat, free) under two conditions of with and without personal lift assist device.Findings. The lift assist device significantly reduced the required muscular effort of the lumbar (p = 0.001) and thoracic erector spinae with no significant differences in the level of abdominal muscle activity. The amount of integrated electromyography reduction ranged from 14.4% to 27.6% for the lumbar and thoracic erector spinae respectively. Simple measures of trunk posture and accelerations confirmed that there were no differences in lifting technique that would cause the integrated electromyography activity to be reduced. No major kinematic differences were found when the lift assist device was worn indicating that it did not alter these specific technique variables.Interpretation. The lift assist device did reduce the required muscular effort of the lumbar and thoracic erector spinae without adversely affecting the level of abdominal muscle activity. This reduction may help reduce the risk of recurring back injuries or assist in the return to work phase, especially in repetitive tasks. (c) 2006 Elsevier Ltd. All rights reserved.