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The muscular load on the lower back and shoulders due to lifting at different lifting heights and frequencies

机译：在不同的举升高度和频率下举起时，下背部和肩膀上的肌肉负荷

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摘要

The aim of the study was to investigate the muscular load on the lower back and shoulders and the circulatory load on employees at a post center during repetitive lifting of mail transport boxes. A mock-up was designed in the laboratory, a total of nine combinations of lifting height and frequency were studied. Surface EMG was recorded bisymmetrically from m. erector spinae (L3-level) and m. trapezius. The circulatory load was evaluated by measuring the heart rate. The results show a trade off between the low back and shoulders. The maximum load on the low back occurred at the low lifting height (36.3 and 54.4 cm) whereas the maximum load on the shoulders occurred at the high lifting height (144.9 and 163.0 cm). (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 39]
机译：该研究的目的是调查在反复抬起邮件运输箱期间，下背部和肩膀的肌肉负荷以及邮局中心员工的循环负荷。在实验室设计了一个模型，总共研究了九种提升高度和频率的组合。表面肌电图从m双对称记录。竖脊肌（L3级）和m。斜方肌。通过测量心率来评估循环负荷。结果显示了在下背部和肩膀之间的权衡。下背的最大负荷发生在低抬高高度（36.3和54.4 cm），而肩部的最大负荷发生在高抬高高度（144.9和163.0 cm）。 （C）1998 Elsevier ScienceLtd。保留所有权利。 [参考：39]

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