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‫بــا‬ ‫مزمــن‬ ‫تمــاس‬ .]3[ ‫نمــود‬ ‫اشــاره‬ ‫کار‬ ‫لبــاس‬ ‫نامناســب‬ ‫پوشــش‬ ،]4[ ‫فیزیولوژیکــی‬ ‫اختــالالت‬ ‫بــروز‬ ‫موجــب‬ ‫گــرم‬ ‫دمایــی‬ ‫شــرایط‬ ‫عصبــی‬ ‫اختــالالت‬ ‫افزایــش‬ ‫بــا‬ ‫ذهنــی‬ ‫و‬ ‫جســمی‬ ‫عملکــرد‬ ‫کاهــش‬ ‫ـت‬ ‫نهایـ‬ ‫در‬ ‫و‬ ]6[ ‫ـدن‬ ‫بـ‬ ‫ـی‬ ‫آبـ‬ ‫ـم‬ ‫کـ‬ ‫و‬ ‫ـتگی‬ ‫خسـ‬ ‫ـاس‬ ‫احسـ‬ ،]5[ ‫ـی‬ ‫روانـ‬ ‫و‬ ‫ـش‬ ‫کاهـ‬ ‫[8]و‬ ‫ـوادث‬ ‫حـ‬ ‫ـر‬ ‫خطـ‬ ‫ـروز‬ ‫بـ‬ ‫ـش‬ ‫افزایـ‬ ،]7[ ‫وری‬ ‫ـره‬ ‫بهـ‬ ‫ـش‬ ‫کاهـ‬ ‫اثــرات‬ ‫کــه‬ ‫اســت‬ ‫زیــادی‬ ‫مــدت‬ ‫شــود.‬ ‫می‬ ‫کار‬ ‫در‬ ]10 ,9[ ‫ایمنــی‬ ‫ـت‬ ‫ثابـ‬ ‫ـان‬ ‫انسـ‬ ‫ـی‬ ‫ایمنـ‬ ‫و‬ ‫ـالمت‬ ‫سـ‬ ‫ـر‬ ‫بـ‬ ‫ـرم‬ ‫گـ‬ ‫ـط‬ ‫محیـ‬ ‫در‬ ‫کار‬ ‫ـار‬ ‫بـ‬ ‫ـان‬ ‫زیـ‬ ‫ـی،‬ ‫گرمایـ‬ ‫ـترس‬ ‫اسـ‬ ‫ـرل‬ ‫کنتـ‬ ‫ـدم‬ ‫عـ‬ ‫ـورت‬ ‫صـ‬ ‫در‬ ‫ـه‬ ‫کـ‬ ،]11[ ‫ـت‬ ‫اسـ‬ ‫ـده‬ ‫شـ‬ ‫خفیــف‬ ‫اختــالالت‬ ‫از‬ ‫هــا‬ ‫بیماری‬ ‫و‬ ‫عــوارض‬ ‫از‬ ‫ای‬ ‫گســترده‬ ‫طیــف‬ .]12[ ‫ـود‬ ‫شـ‬ ‫ـاد‬ ‫ایجـ‬ ‫ـت‬ ‫اسـ‬ ‫ـن‬ ‫ممکـ‬ ‫آور‬ ‫ـرگ‬ ‫مـ‬ ‫ـرایط‬ ‫شـ‬ ‫ـا‬ ‫تـ‬ ‫ـوزش‬ ‫سـ‬ ‫ـل‬ ‫مثـ‬ 2008 ‫ســال‬ ‫در‬ ‫کــه‬ ‫مــروری‬ ‫ای‬ ‫مطالعــه‬ ‫در‬ ‫همکارانــش‬ ‫و‬ ‫کــووات‬ Abstract Introduction:During physical activity in hot environments, sweating with evaporation as an important physiological response of the body increases and could lead to dehydration. Long-term water shortages could adversely affect vital organs. The aim of this study was to determine heat stress and dehydration status of workers in hot workplaces. Methods: This cross sectional study was done on 90 workers of a sugar factory, which were exposed to heat. 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, and in order to assess dehydration level a refractometer was used. Data obtained from this study were analyzed by comparing means, t test, and paired t test tests by the SPSS 20 software. Results: 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 the population had some degree of dehydration. Furthermore, 63.4% were significantly dehydrated (urine SG < 1.020) and 28% were severely dehydrated (urine SG < 1.030) and the mean specific gravity was 1.025 ± 0.043. The correlations between heat strains, urine density, and heat stress including oral temperature and heart rate were significant (P > 0.05). Conclusions:A high percentage of the study population had some degree of dehydration based on the results. It seems that planning in order to control heat stresses by replacement of drinking is necessary.