期刊
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
卷 23, 期 1, 页码 206-215出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jelekin.2012.08.016
关键词
Engineering controls; Ergonomic intervention; Low back disorders; Load transfer device; Passive torso extensor moment
资金
- Western Center for Agricultural Health and Safety
- Henry A. Jastro and Peter J. Shields Graduate Research Scholarship, at the University of Calfornia, Davis
A prior laboratory study found that when wearing a weight transfer device in the stooped posture, trunk flexions were reduced, and subjects who did not experience flexion-relaxation of the erector spinae had reduced back muscle activity. Whole-body musculoskeletal models, which included individual passive torso stiffness and anthropometry, were implemented to predict loads in the passive tissues of the back and the leg joints. Results predicted that when wearing the device in the stooped posture, compression and shear forces at the L5-S1 level were reduced by 13% and 12% respectively. Internal loads in the leg joints were reduced between 10% and 31%. Much of the reduction in joint loads may be a result of the device's ability to limit torso flexion during stoop, rather than a transferring of load. While these results show possible benefit in the short-term, further study is needed on the long-term effects to determine if the device is an effective intervention for those who use the stooped posture routinely. (c) 2012 Elsevier Ltd. All rights reserved.
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