Moriguchi Cristiane Shinohara, Carnaz Leticia, de Miranda Luiz Carlos, Marklin Richard William, Coury Helenice Jane Cote Gil
Department of Physical Therapy, Federal University of São Carlos, Washington Luís Road, Km 235, SP310, CEP 13565-905, São Carlos, São Paulo, Brazil.
Work. 2012;41 Suppl 1:2492-5. doi: 10.3233/WOR-2012-0487-2492.
Loading/unloading a ladder on vehicles are frequent tasks and involve overhead handling that may expose workers to risk factors of shoulder musculoskeletal disorders. The objective of the present study was to evaluate posture, forces required and perceived exertion when loading and unloading the ladder on a utility truck. Thirteen male overhead line workers from an electric utility in Brazil participated in this study. Shoulder elevation angle was measured using inclinometers. The required force to load/unload the ladder was measured by dynamometer. Subjective assessment of the perceived exertion was recorded to compare the exertion reported during the test conditions to the field conditions. The task of loading/unloading the ladder presented risks of shoulder musculoskeletal disorders (MSDs) to workers because it requires high levels of force (approximately 60% of the maximal force) combined with overhead posture of the shoulders (more than 100° from the neutral posture). Age and height presented to interfere in biomechanical risks presented in load/unload task. There was no significant difference between the subjective exertion during the test conditions and handling the ladder in the field. Ergonomic intervention is recommended to reduce these risks for shoulder MSDs.
在车辆上装卸梯子是常见任务，涉及高空作业，这可能使工人面临肩部肌肉骨骼疾病的风险因素。本研究的目的是评估在多功能货车上装卸梯子时的姿势、所需力量和主观用力程度。来自巴西一家电力公司的13名男性架空线路工人参与了本研究。使用倾角仪测量肩部抬高角度。用测力计测量装卸梯子所需的力。记录主观用力程度的评估结果，以比较测试条件下和现场条件下报告的用力程度。装卸梯子的任务给工人带来了肩部肌肉骨骼疾病（MSD）的风险，因为它需要高水平的力量（约为最大力量的60%），同时肩部处于高空姿势（与中立姿势相差超过100°）。年龄和身高似乎会干扰装卸任务中的生物力学风险。测试条件下的主观用力程度与现场搬运梯子时没有显著差异。建议采取人体工程学干预措施以降低这些肩部MSD的风险。
