Muscle fatigue related to human posture using a brush cutter for landscape gardening: a preliminary study.

IF 0.8 4区医学 Q4 PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH

Medycyna pracy Pub Date : 2022-05-17 DOI:10.13075/mp.5893.01175

Wanying Yang, Bo Li, Shusen Li, Yanlin Zhang, H. Yang

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引用次数: 0

Abstract

BACKGROUND Brush cutters are widely used in Chinese landscape gardening and agricultural laboring which leads the operators being exposed to many risks. Low back pain (LBP) is particularly common and can lead to substantial personal, community and financial burdens. The aim of the presented study was to measure the activity and function of each torso muscle of the operator when using the bush cutter, so as to evaluate the muscle injury of the operator during using several common brush cutters for different landscape tasks. MATERIAL AND METHODS The human postures of 6 workers using 2 types of brush cutters in the 3 working conditions were recorded and measured by using a surface electromyography (sEMG) system and a camera. The test results were compared by t-test and sign test. The effect of human posture on the sEMG signal of trunk muscles in different working condition were analyzed by ANOVA. RESULTS In the 3 working conditions, except for the left trapezius muscle, the muscle load of operating the backpack brush cutter is higher than that of operating side-mounted brush cutter. When operating the side-mounted backpack brush cutter, the force on both sides of the trapezius muscle is uneven, the load of the left trapezius muscle is >25%, and the maximum value is >30%. CONCLUSIONS The results highlighted significant differences in the effects of different working postures on the muscle activities of workers' trunk. Safe operation standards should therefore be taken to protect the exposed workers and to improve the industrial design of irrigation cutters to prevent the occurrence of occupational diseases. Med Pr. 2022;73(3).

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肌肉疲劳与人类在园林中使用割草机的姿势有关：一项初步研究。

背景割草机广泛应用于中国的园林绿化和农业生产中，这导致操作人员面临许多风险。腰痛（LBP）特别常见，可导致巨大的个人、社区和经济负担。本研究的目的是测量操作员在使用灌木切割器时每个躯干肌肉的活动和功能，以评估操作员在使用几种常见的灌木切割器执行不同景观任务时的肌肉损伤。材料与方法利用表面肌电（sEMG）系统和摄像机，记录并测量了6名工人在3种工作条件下使用2种类型的毛刷刀具的人体姿势。检验结果采用t检验和符号检验进行比较。采用方差分析法分析了不同工作条件下人体姿势对躯干肌肉sEMG信号的影响。结果在3种工作条件下，除左斜方肌外，操作背包式刷刀的肌肉负荷高于操作侧装式刷刀。在操作侧装式背包刷刀时，斜方肌两侧受力不均匀，左斜方肌负荷>25%，最大值>30%。结论不同工作姿势对工人躯干肌肉活动的影响存在显著差异。因此，应采取安全操作标准来保护暴露在外的工人，并改进灌溉切割机的工业设计，以防止职业病的发生。Med Pr.2022；73（3）。

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来源期刊

Medycyna pracy PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH-

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal publishes original papers, review papers and case studies in Polish and English. The subject matter of the articles includes occupational pathology, physical, chemical and biological agents at workplace, toxicology, mutagenesis, health policy, health management, health care, epidemiology, etc. The magazine also includes reports from national and international scientific conferences on occupational medicine. It also contains letters to the editor. Each first-in-year issue of the magazine comprises former-year indices of authors and keywords.