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:: Volume 16, Issue 2 (Bimonthly 2012) ::
Feyz 2012, 16(2): 112-120 Back to browse issues page
Combined application of wet-bulb globe temperature and heart rate under hot climatic conditions: a guide to better estimation of the heat strain
Dehghan, Mortazavi *, Jafari, Maracy
University of Tarbiat Modares , rmortazav@modares.ac.ir
Abstract:   (5697 Views)

Background: Working under hot climatic conditions, especially in summer, has a high potential for inducing heat strain in workers. The wet-bulb globe temperature (WBGT) index has an inherent limitation to estimate the heat strain due to not taking into account the non-environmental factors. The aim of this study was to evaluate the combined application of WBGT index and a physiological strain index (PSIHR) based on heart rate in the estimation of the heat strain under hot climatic conditions.

Materials and Methods: This cross-sectional study was conducted on 122 men in the center and south of Iran (51 and 71 workers from Isfahan steel company and Assaluyeh national petrochemical company, respectively) between July and September 2010. The WBGT index, heart rate and the auditory canal temperature were measured at rest and during the work. Data were analyzed using descriptive statistics and logistic regression.

Results: Results of the logistic regression analysis revealed that the WBGT index is a poor predictor for heat strain with a sensitivity and specificity of 53% and 65%, respectively. However, the combined application of the WBGT and PSIHR indexes was a better predictor for heat strain and its sensitivity and specificity were 75% and 69%, respectively.

Conclusion: A combined application of the WBGT and PSIHR indexes can be a valid estimator of heat strain for hot climatic conditions in the center and south of Iran.

Keywords: WBGT index, PSIHR index, Heat strain
Full-Text [PDF 217 kb]   (1992 Downloads)    
Type of Study: Research | Subject: medicine, paraclinic
Received: 2012/02/28
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Dehghan, Mortazavi, Jafari, Maracy. Combined application of wet-bulb globe temperature and heart rate under hot climatic conditions: a guide to better estimation of the heat strain. Feyz. 2012; 16 (2) :112-120
URL: http://feyz.kaums.ac.ir/article-1-1423-en.html


Volume 16, Issue 2 (Bimonthly 2012) Back to browse issues page
مجله علمی پژوهشی فیض ::: دانشگاه علوم پزشکی کاشان KAUMS Journal ( FEYZ )
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