Application of Wearable Biosensors to Construction Sites. I: Assessing Workers’ Stress
Publication: Journal of Construction Engineering and Management
Volume 145, Issue 12
Abstract
One of the major hazards of the workplace, and in life in general, is occupational stress, which adversely affects workers’ well-being, safety, and productivity. The construction industry is one of the most stressful occupations. Current stress-assessment tools rely either on a subject’s perceived stress (e.g., stress questionnaires) or an individual’s chemical reaction to stressors (e.g., cortisol hormone). However, these methods can interrupt ongoing tasks and therefore may not be suitable for continuous measurement. To address this problem, the authors aim to develop and validate a framework for noninvasive and nonsubjective measurement of worker stress by examining changes in workers’ physiological signals collected from a wearable biosensor. The framework applies various filtering methods to reduce physiological signal noises and extracts the patterns of physiological signals as workers experience various stress levels. Then, the framework learns these patterns by applying a supervised-learning algorithm. To examine the performance of the proposed framework, the authors collected a physiological signal from 10 construction workers in the field. The proposed framework resulted in a stress-prediction accuracy of 84.48% in distinguishing between low and high stress levels and 73.28% in distinguishing among low, medium, and high stress levels. The results confirmed the potential of the proposed framework for assessing workers’ stress in the field. Automatic predictions of workers’ physical demand levels based on physiological signals is described in a companion paper. This study, along with the companion paper, contributes to the body of knowledge on the in-depth understanding of construction workers’ stress on construction sites by developing a noninvasive means for continuous monitoring and assessing workers’ stress. The proposed stress-recognition framework is expected to enhance workers’ health, safety, and productivity through early detection of occupational stressors on actual sites.
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Data Availability Statement
Data generated or analyzed during the study are available from the corresponding author by request.
Acknowledgments
The authors would like to acknowledge their industry partners for their help in data collection, as well as anonymous participants who participated in the data collection.
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Journal of Construction Engineering and Management
Volume 145 • Issue 12 • December 2019
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©2019 American Society of Civil Engineers.
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Received: Oct 4, 2018
Accepted: May 2, 2019
Published online: Sep 30, 2019
Published in print: Dec 1, 2019
Discussion open until: Feb 29, 2020
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