Evaluation of an ergonomically designed schoolbag: Heart rate variability and body discomfort rating.

IF 2.4 3区 工程技术 Q2 ENGINEERING, INDUSTRIAL Cognition Technology & Work Pub Date : 2022-05-02 DOI:10.3233/WOR-205152
M. Ramadan, Sultan N Al-Tayyar, Mohammed H. Alhaag, A. T. Soliman, A. E. Abdelgawad
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Abstract

BACKGROUND Unsuitable schoolbags may stress the spine and promote poor body posture, particularly for school students. Global recommendations have suggested that schoolbag weight must not exceed 10% of a healthy student's body mass, which would need continuous monitoring and enforcement. OBJECTIVES The present study presents a comparison between an ergonomically designed schoolbag, which helps reduce the potential effects of carrying a load, and a commercial one. METHODS A total of 30 healthy male students were recruited for this experiment. Independent variables determined were schoolbag type (ergonomically designed and commercial schoolbags) and three load levels based on body mass percentage (i.e., 10%, 15%, and 20% of body mass). Heart rate variability (HRV) and body discomfort rating were then measured. RESULTS Our results showed that the developed schoolbag promoted enhanced subjective measures and HRV response at 15% and 20% of body mass. Participants who wore the developed schoolbags experienced significantly lesser neck, shoulder, upper and lower trunk discomfort than those who wore the traditional ones. Changing the load percentage from 10% to 15% caused an increase in heart rate among participants carrying a commercial schoolbag but a decrease in heart rate among those carrying the developed schoolbag. CONCLUSIONS The findings presented herein suggest introducing strategies for reducing the potential impact of load carrying through the combined effect of new educational inventions and policy changes.
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一个符合人体工程学设计的书包的评价:心率变异性和身体不适等级。
背景不合适的书包可能会对脊柱造成压力,导致不良的身体姿势,尤其是对在校学生来说。全球建议建议,书包重量不得超过健康学生体重的10%,这需要持续监测和执行。目的本研究对符合人体工程学设计的书包进行了比较,这种设计有助于减少负重的潜在影响,而商用书包则是如此。方法招募30名健康男大学生参加实验。确定的自变量是书包类型(符合人体工程学设计的书包和商业书包)和基于体重百分比(即体重的10%、15%和20%)的三种负荷水平。然后测量心率变异性(HRV)和身体不适评分。结果开发的书包提高了学生在15%和20%体重时的主观测量和HRV反应。与那些背传统书包的人相比,背先进书包的参与者的颈部、肩部、上半身和下半身的不适明显减轻。将负重百分比从10%改变到15%导致携带商业书包的参与者心率增加,而携带发达书包的参与者心率下降。结论本文的研究结果建议通过新的教育发明和政策变化的共同作用,引入策略来减少负荷的潜在影响。
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来源期刊
Cognition Technology & Work
Cognition Technology & Work ENGINEERING, INDUSTRIAL-
CiteScore
6.90
自引率
7.70%
发文量
26
审稿时长
>12 weeks
期刊介绍: Cognition, Technology & Work focuses on the practical issues of human interaction with technology within the context of work and, in particular, how human cognition affects, and is affected by, work and working conditions. The aim is to publish research that normally resides on the borderline between people, technology, and organisations. Including how people use information technology, how experience and expertise develop through work, and how incidents and accidents are due to the interaction between individual, technical and organisational factors. The target is thus the study of people at work from a cognitive systems engineering and socio-technical systems perspective. The most relevant working contexts of interest to CTW are those where the impact of modern technologies on people at work is particularly important for the users involved as well as for the effects on the environment and plants. Modern society has come to depend on the safe and efficient functioning of a multitude of technological systems as diverse as industrial production, transportation, communication, supply of energy, information and materials, health and finance.
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