title: Comparing the physiological and perceptual responses of construction workers (bar benders and bar fixers) in a hot environment.
abstract: This study aimed to (1) quantify the respective physical workloads of bar bending and fixing; and (2) compare the physiological and perceptual responses between bar benders and bar fixers. Field studies were conducted during the summer in Hong Kong from July 2011 to August 2011 over six construction sites. Synchronized physiological, perceptual, and environmental parameters were measured from construction rebar workers. The average duration of the 39 field measurements was 151.1 ± 22.4 min under hot environment (WBGT = 31.4 ± 2.2 °C), during which physiological, perceptual and environmental parameters were synchronized. Energy expenditure of overall rebar work, bar bending, and bar fixing were 2.57, 2.26 and 2.67 Kcal/min (179, 158 and 186 W), respectively. Bar fixing induced significantly higher physiological responses in heart rate (113.6 vs. 102.3 beat/min, p < 0.05), oxygen consumption (9.53 vs. 7.14 ml/min/kg, p < 0.05), and energy expenditure (2.67 vs. 2.26 Kcal/min, p < 0.05) (186 vs. 158 W, p < 0.05) as compared to bar bending. Perceptual response was higher in bar fixing but such difference was not statistically significant. Findings of this study enable the calculation of daily energy expenditure of rebar work.
authors: Human Performance Laboratory, Technological and Higher Education Institute of Hong Kong, Room 313, 20A, Tsing Yi Road, Tsing Yi Island New Territories, Hong Kong, China. Electronic address: delwong@alumni.cuhk.net.
authors: Del Pui-Lam
authors: del PL
authors: Wong
authors: Department of Health and Physical Education, The Hong Kong Institute of Education, D4-2/F-03, Block D4, 10 Lo Ping Road, Tai Po, N.T., Hong Kong, China. Electronic address: joannechung@ied.edu.hk.
authors: Joanne Wai-Yee
authors: JW
authors: Chung
authors: Department of Building and Real Estate, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. Electronic address: albert.chan@polyu.edu.hk.
authors: Albert Ping-Chuen
authors: AP
authors: Chan
authors: Department of Building and Real Estate, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. Electronic address: francis.wong@polyu.edu.hk.
authors: Francis Kwan-Wah
authors: FK
authors: Wong
authors: Department of Building and Real Estate, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. Electronic address: yiwen96@163.com.
authors: Wen
authors: W
authors: Yi
mesh_terms: D000328:Adult; D000886:Anthropometry; D060389:Construction Industry; D004734:Energy Metabolism / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology; D018882:Heat Stress Disorders / Q000209:etiology*; D006358:Hot Temperature; D006801:Humans; D008297:Male; D008451:Maximal Voluntary Ventilation / Q000502:physiology; D008875:Middle Aged; D009784:Occupational Diseases / Q000209:etiology*; D009790:Occupations; D010101:Oxygen Consumption / Q000502:physiology; D013647:Task Performance and Analysis
keywords: Construction work; Heat stress; Oxygen consumption