Determining an optimal recovery time for construction rebar workers after working to exhaustion in a hot and humid environment
Determining an optimal recovery time for construction rebar workers after working to exhaustion in a hot and humid environment
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DOI：
10.1016/j.buildenv.2012.07.006
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发表时间：
2012-12-01
影响因子：
7.4
通讯作者：
Chan, Daniel W. M.
中科院分区：
文献类型：
--
作者：
Chan, Albert P. C.;Yi, Wen;Chan, Daniel W. M.
本文是对先前发表在《建筑与环境》杂志上的一篇论文的扩展。在确定了一个最佳的恢复时间在一个受控的气候环境中，本文的目的是调查建筑钢筋工人的真实的影响复制的临床实验，一系列的实地研究。实地研究是在香港夏季进行的。19名钢筋工人在两个建筑工地执行固定和弯曲钢筋的任务，直到自愿筋疲力尽，并被允许在现场恢复，直到他们的生理状况恢复到工作前的水平或更低。生理应变指数（PSI）被用作衡量标准，以确定恢复率。在2011年7月至8月的14个工作日内收集了411组气象和生理数据，进行整理，以得出最佳恢复时间。结果表明，钢筋工40 min平均回收率为94%，35 min为93%，30 min为92%，25 min为88%，20 min为84%，15 min为78%，10 min为68%，曲线拟合结果表明，恢复时间是预测恢复率的显著变量（R-2 = 0.99，P < 0.05）。在极端炎热的天气下，应在工作之间增加休息时间，使工人能够从热压力中恢复过来。每个休息时间的频率和持续时间应根据累积恢复曲线在不同利益相关者之间达成一致。(c)2012爱思唯尔有限公司保留所有权利。
This paper is an extension to a paper previously published in the journal Building and Environment. Having determined an optimal recovery time in a controlled climatic environment, this paper aims to investigate the real impact on construction rebar workers by replicating the clinical experimentation to a series of field studies. Field studies were conducted during the summer time in Hong Kong. Nineteen rebar workers performed tasks of fixing and bending steel reinforcement bars on two building construction sites until voluntary exhaustion and were allowed to recover on site until their physiological conditions returned to the pre-work level or lower. Physiological Strain Index (PSI) was used as a yardstick to determine the rate of recovery. A total of 411 sets of meteorological and physiological data collected over fourteen working days between July and August of 2011 were collated to derive the optimal recovery time. It was found that on average a rebar worker could achieve 94% recovery in 40 min; 93% in 35 min; 92% in 30 min; 88% in 25 min; 84% in 20 min; 78% in 15 min; 68% in 10 min; and 58% in 5 min. Curve estimation results showed that recovery time is a significant variable to predict the rate of recovery (R-2 = 0.99, P < 0.05). Additional rest times should be introduced between works in extreme hot weather to enable workers to recover from heat stress. Frequency and duration of each rest time should be agreed among different stakeholders based on the cumulative recovery curve. (c) 2012 Elsevier Ltd. All rights reserved.