The relation between heat strain and hydration status in the food industry employees in Mashhad, 2014
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Department of Occupational Health Engineering, Neyshabur University of Medical Sciences, Neyshabur, Iran
Department of Environmental Health Engineering, School of Public Health, Neyshabur University of Medical Sciences, Neyshabur, Iran
Department of Occupational Health, Shahid Sadoughi University of Medical Sciences,Yazd, Iran
Somayeh Bolghanabadi   

Department of Occupational Health Engineering, Neyshabur University of Medical Sciences, Neyshabur, Iran.
Online publish date: 2018-05-28
Publish date: 2019-10-31
Submission date: 2017-07-02
Acceptance date: 2017-11-22
Pol. Ann. Med. 2019;26(1):30–35
During physical activity in hot environments, sweating along with evaporation is increased, as the most important physiological response, which can lead to dehydration. Especially those who participate in physical activity in warm environments.

The aim of this study was the determination of heat stress and its risk assessment and investigates in dehydration conditions of workers in hot workplaces.

Material and methods:
This cross-sectional study was done on 90 workers in the food industry. Heart rate and oral temperature were respectively measured using a heart rate meter and an oral thermometer. The WBGT index was recorded and the HSSI questionnaire was completed simultaneously, in order to assess the dehydration level was measured of refract meter. Data obtained from this study were analyzed using compare means and t-test, paired t-test tests with SPSS 20 software.

Results and discussion:
Heat stress exceeded the national and international recommended limits based on the WBGT index in 44% of cases of workstations. According to this study, 8.5% of our population had some degree of dehydration; 63.4% of them were significantly dehydrated (urine SG > 1020) and 28% of them were severely dehydrated (urine SG>1030). The correlations between heat strains, urine density and heat stress, including oral temperature, heart rate were significant (P < 0.05).

High percentage of our population was dehydrated. On the basis of results of this study, heat stress condition was worrying. It seems that planning in order to control of heat stresses by replacing drinking is necessary.

The authors wish to acknowledge the invaluable cooperation and support of the Student Research Committee of Neyshabour University of Medical Sciences.
None declared.
Kenefick RW, Sawka MN. Hydration at the work site. J Am Coll Nutr. 2007;26(5 Suppl):597S–603S.
Amiri M, Eslamian S. Investigation of climate change in Iran. J Environ Sci Technol. 2010;3(4):208–216.
Holmer I. Protective clothing in hot environments. Ind Health. 2006;44(3):404–413.
Donoghue AM, Sinclair MJ, Bates GP. Heat exhaustion in a deep underground metalliferous mine. Occup Environ Med. 2000;57(3):165–174.
Sund-Levander M, Forsberg C, Wahren LK. Normal oral, rectal, tympanic and axillary body temperature in adult men and women: a systematic literature review. Scand J Caring Sci. 2002;16(2):122–128.
Wan M. Assessment of occupational heat strain. A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Department of Environmental and Occupational Health, College of Public Health, University of South Florida. 2006. Accessed: April 23, 2018.
Hannani M, Kashani MM, Mousavi SGA, Bahrami A. Evaluation of workplaces heat stress for bakers in kashan city Feyz. 2004;8(3):25–29.
Tian Z, Zhu N, Zheng G, Wei H. Experimental study on physiological and psychological effects of heat acclimatization in extreme hot environments. Build Environ. 2011;46(10):2033–2041.
Epstein Y, Moran DS. Thermal comfort and the heat stress indices. Ind Health. 2006;44(3):388–398.
Morabito M, Cecchi L, Crisci A, Modesti PA, Orlandini S. Relationship between work-related accidents and hot weather conditions in Tuscany (central Italy). Ind Health. 2006;44(3):458–464.
Ramsey JD, Burford CL, Beshir MY, Jensen RC. Effects of workplace thermal conditions on safe work behavior. J Saf Res. 1983;14(3):105–114.
Bethea D, Parsons K. The development of a practical heat stress assessment methodology for use in UK industry. Loughborough: Loughborough University; 2002.
Lin T-P, Matzarakis A, Hwang R-L. Shading effect on long-term outdoor thermal comfort. Build Environ. 2010;45(1):213–221.
Kovats RS, Hajat S. Heat stress and public health: a critical review. Annu Rev Public Health. 2008;29:41–55.
Sheiner EK, Sheiner E, Hammel RD, Potashnik G, Carel R. Effect of occupational exposures on male fertility: literature review. Ind Health. 2003;41(2):55–62.
Jackson LL, Rosenberg HR. Preventing heat-related illness among agricultural workers. J agromed. 2010;15(3):200–215.
Kalhoff H. Mild dehydration: a risk factor of broncho-pulmonary disorders? Eur J Clin Nutr. 2003;57(2):81–87.
Arnaud M. Mild dehydration: a risk factor of constipation?. Eur J Clin Nutr. 2003;57(2): 88–95.
Mentes J. Oral Hydration in Older Adults: Greater awareness is needed in preventing, recognizing, and treating dehydration. Am J Nurs.2006;106(6):40–49.
Maughan R. Impact of mild dehydration on wellness and on exercise performance. Eur J Clin. 2003;57(2):19–23.
Lawlor DA, Smith GD, Mitchell R, Ebrahim S. Adult blood pressure and climate conditions in infancy: a test of the hypothesis that dehydration in infancy is associated with higher adult blood pressure. Am J Epidemiol. 2006;163(7):608–614.
Manz F, Wentz A. The importance of good hydration for the prevention of chronic diseases. Nutr Rev. 2005;63(1):2–5.
Romero V, Akpinar H, Assimos DG. Kidney stones: a global picture of prevalence, incidence, and associated risk factors. Rev Urol. 2010;12(2):86–96.
Pierce L, Bloom B. Observations on urolithiasis among American troops in a desert area. J Urol 1944;54:466–470.
Tawatsupa B, Lim LL, Kjellstrom T, Seubsman S-a, Sleigh A, Team TCS. Association between occupational heat stress and kidney disease among 37 816 workers in the Thai Cohort Study (TCS). J Epidemiol. 2012;22(3):251–260.
Hunt AP, Parker AW, Stewart IB. Heat strain and hydration status of surface mine blast crew workers. Occup Environ Med. 2014;56(4):409–414.
Dehghan H, Mortzavi SB, Jafari MJ, Maracy MR. The reliability and validity of questionnaire for preliminary assessment of heat stress at workplace. ISMJ. 2015;18(4):810–826.
Kavouras SA. Assessing hydration status. Curr Opin Clin Nutr Metab Care. 2002;5(5):519–524.
Jalali M, Aliabadi M, Farhadian M, Negahban S. Investigation of the variation ofurine densityas abiomarker of dehydrationconditionsin workers employed in hotworkplaces. IOH.2014;11(2):99–110.
Xiang J, Peng B, Pisaniello D, Hansen A. Health impacts of workplace heat exposure: an epidemiological review. Ind Health. 2014;52(2):91–101.
Dehghan H, Mortazavi SB, Jafari MJ, Maracy MR. Cardiac strain between normal weight and overweight workers in hot/humid weather in the persian gulf. Int J Prev Med. 2013;4:1147–1153.
Hajizadeh R, Golbabaie F, Monazam Esmaielpour M, Mehri A, Hosseini M, Khodaparast I. Assessing the heat stress of brick-manufacturing units’ workers based on WBGT index in Qom city. JHSW. 2015;4(4):9–20.
Gagge AP, Stolwijk J, Hardy J. Comfort and thermal sensations and associated physiological responses at various ambient temperatures. Environ Res. 1967;1(1):1–20.
Dehghan H. Validating the perceptual strain index for the evaluation of heat strain under hot laboratory conditions. J Ergon. 2015;2(4):55–63.
Negahban SAR, Aliabadi M, Babayi Mesdaraghi Y, et al. Investigating the association between heat stress and its psychological response to determine the optimal index of heat strain. J Occup Hyg Eng. 2014;1(1):8–15.
McQueen SL. Evaluation of Heat Stress in Migrant Farmworkers. 2012.
Bates GP, Miller VS, Joubert DM. Hydration status of expatriate manual workers during summer in the Middle East. Ann Occup Hyg. 2009;54(2):137–143.
Miller V, Bates G. Hydration of outdoor workers in north-west Australia. J Occup Health Saf Aust New Zeal. 2007;23(1):79.
Hamano S, Nakatsu H, Suzuki N, Tomioka S, Tanaka M, Murakami S. Kidney stone disease and risk factors for coronary heart disease. Int J Urol. 2005;12(10):859–863.