Ulrey Brent L, Fathallah Fadi A
Occupational Biomechanics Laboratory, Department of Biological and Agricultural Engineering, University of California, One Shields Ave, Davis, CA 95616, USA.
Work. 2012;41 Suppl 1:2381-3. doi: 10.3233/WOR-2012-0469-2381.
Adoption of the stooped posture in the workplace is widespread throughout the world in agriculture, construction, and mining. This type of posture has been established as a risk factor for developing low back disorders (LBDs). The purpose of this study is to evaluate a personal weight transfer device as a possible intervention to reduce the load on the lumbar spine, thereby reducing the risk of developing LBDs. Eighteen healthy subjects performed stooped posture tasks in a laboratory study designed to simulate harvesting of low-growing crops. Results showed that when wearing the device in the static stooped posture, biceps femoris activity was reduced by 17%, lumbar flexion was reduced by 12%, ankle plantar-flexion increased by 5%, and the lumbar erector spinae of those subjects who did not experience flexion-relaxation of the erector spinae was reduced by 26%. Hip and knee flexion were not significantly altered. Therefore, the device may be beneficial for those with existing LBDs, and who use the stooped posture routinely.
在农业、建筑和采矿业中，工作场所采用弯腰姿势在世界各地都很普遍。这种姿势已被确定为导致下背部疾病（LBDs）的一个风险因素。本研究的目的是评估一种个人体重转移装置，作为一种可能的干预措施，以减轻腰椎的负荷，从而降低患LBDs的风险。18名健康受试者在一项旨在模拟收获低矮作物的实验室研究中执行弯腰姿势任务。结果表明，在静态弯腰姿势下佩戴该装置时，股二头肌活动减少了17%，腰椎前屈减少了12%，踝关节跖屈增加了5%，而那些竖脊肌没有出现屈伸放松的受试者的竖脊肌活动减少了26%。髋部和膝盖的屈曲没有明显改变。因此，该装置可能对那些患有现有LBDs且经常采用弯腰姿势的人有益。
