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Title: Role of work uniform in alleviating perceptual strain among construction workers
Authors: Yang, Y
Chan, APC 
Keywords: Construction workers
Field experiment
Linear mixed-effects model
Perceptual strain index
Issue Date: 2017
Publisher: Roudou Anzen Eisei Sougou Kenkyujo,National Institute of Occupational Safety and Health, Japan
Source: Industrial health, 2017, v. 55, no. 1, p. 76-86 How to cite?
Journal: Industrial health 
Abstract: This study aims to examine the benefits of wearing a new construction work uniform in real-work settings. A field experiment with a randomized assignment of an intervention group to a newly designed uniform and a control group to a commercially available trade uniform was executed. A total of 568 sets of physical, physiological, perceptual, and microclimatological data were obtained. A linear mixed-effects model (LMM) was built to examine the cause-effect relationship between the Perceptual Strain Index (PeSI) and heat stressors including wet bulb globe temperature (WBGT), estimated workload (relative heart rate), exposure time, trade, workplace, and clothing type. An interaction effect between clothing and trade revealed that perceptual strain of workers across four trades was significantly alleviated by 1.6–6.3 units in the intervention group. Additionally, the results of a questionnaire survey on assessing the subjective sensations on the two uniforms indicated that wearing comfort was improved by 1.6–1.8 units when wearing the intervention type. This study not only provides convincing evidences on the benefits of wearing the newly designed work uniform in reducing perceptual strain but also heightens the value of the field experiment in heat stress intervention studies.
ISSN: 0019-8366
EISSN: 1880-8026
DOI: 10.2486/indhealth.2016-0023
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