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首页> 外文期刊>Applied Ergonomics >Significance of mat and shoe softness during prolonged work in upright position: based on measurements of low back muscle EMG, foot volume changes, discomfort and ground force reactions
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Significance of mat and shoe softness during prolonged work in upright position: based on measurements of low back muscle EMG, foot volume changes, discomfort and ground force reactions

机译：长时间直立工作时垫子和鞋子柔软度的意义：根据腰背肌肌电图，脚体积变化，不适和地面力反应的测量结果

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The aim of the investigation was to study the significance of mat and shoe softness during prolonged work in an upright position based on some physiological, biomechanical and comfort measurements related to the lower extremities and the low back. Eight healthy female volunteers performed 2 h of simulated standing and 2 h of standing/walking work tasks in the laboratory using four combinations of soft shoes, clogs, soft mat and concrete. Thus, each subject performed a total of eight 2 h work tests. The following parameters were measured pre-experimentally and one or more times during 2 h: total foot volume, vascular volume and interstitial volume of the left foot, EMG from the lumbar paraspinals, movement of centre of gravity (only during standing), biomechanical heel impact (only during standing/walking), perceived discomfort in lumbar back, legs and feet, whole body oxygen uptake, arterial blood pressure and heart rate. Using soft shoes rather than clogs during standing/walking work implies approximately a halving of the foot oedema formation and the heel impact. The effects due to the introduction of the soft mat are negligible. The local circulatory responses in the feet and the EMG-signs of paravertebral muscle fatigue are larger during standing compared to standing/walking work. The two investigated work types in this study differ regarding exposures as well as responses. Thus, it is recommended to shift between these postures and seated work during the working hours to improve job exposures. (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 47]
机译：该研究的目的是基于与下肢和下背部相关的一些生理，生物力学和舒适性指标，研究在直立状态下长时间工作时垫子和鞋子柔软度的重要性。八名健康的女性志愿者使用软鞋，木log，软垫和混凝土的四种组合在实验室中进行了2小时的模拟站立和2小时的站立/步行工作任务。因此，每个受试者总共进行了八次2小时的工作测试。在实验前以及在2小时内对以下参数进行了一次或多次测量：左脚总脚体积，血管体积和间隙体积，腰椎旁肌电图，重心运动（仅在站立时），生物力学足跟影响（仅在站立/行走时），腰背，腿和脚的不适感，全身氧气吸收，动脉血压和心率。在站立/行走过程中使用软鞋而不是木底鞋意味着足部水肿形成和脚跟冲击力减半。由于引入了软垫而产生的影响可以忽略不计。与站立/步行工作相比，站立时脚的局部循环反应和椎旁肌疲劳的EMG征兆更大。在这项研究中，两种被调查的工作类型在接触和反应方面有所不同。因此，建议在工作时间内在这些姿势和坐姿之间切换，以改善工作环境。 （C）1998 Elsevier ScienceLtd。保留所有权利。 [参考：47]

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