Tehran University of Medical Sciences International Journal of Occupational Hygiene 2008-5109 7 1 2015 10 14 1 9 EN HAMIDREZA HEIDARI Deptartment of Occupational Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. FARIDEH GOLBABAEI Deptartment of Occupational Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. ALIAKBAR SHAMSIPOUR Deptartment of Physical Geography, School of Geography, University of Tehran, Tehran, Iran. ABBAS RAHIMI FOROUSHANI Deptartment of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. ABBASALI GAEINI Deptartment of Sport Physiology, School of Physical Education and Sport Science, University of Tehran, Tehran, Iran . 2015 10 14 2015 10 14 In this  cross sectional s tudy carried out in s pring and s ummer, 79 farmers working  in different  job  pos itions including agriculture, hus bandry and horticulture in north of Iran were participa ted. Evaluation of the heat s tres s was conducted us ing Wet Bulb Glob Temperature (WBGT) index according ISO7243 and heat s train evaluation us ing  meas uring  the  individual  phys iological  res pons es  including  aural,  oral  and  mean  s kin  temperatures according ISO 9886. The demographic characteris tics of the s ubjects s uch as age, job experience, BMI and body area were als o gathered  through a ques tionnaire. In general, the s ubjects were in middle ages  (38.44±8.86 yr) and mean and s tandard deviation of years  of expe rience were almos t high (17.49±9.41 yr), too. The s tatis tical analys is was performed  by SPSS 18 s oftware. The  res ults  s howed that the WBGT index values  had  ranging from 24 to  32.6°C in  s ummer  regardles s  of clothing  ins ulation,  metabolic  rate  and  work  res t  regimens .  Of cours e, by correction of thes e parameters the WBGT will accompany with an incens ement. Convers ely, the heat s train monitoring revealed that in no cas e the aural and oral temperatures are higher than the limit allowed. The bes t correlation  coefficient  was obtained  for aural temperature  and WBGT index (r= 0.84, P< 0.001). It  s eems that evaluation of hot and humid environment us ing WBGT index can be as s ociated with an overes timation and encountered our judgment about the environmental condition with a s ignificant error. https://ijoh.tums.ac.ir/index.php/ijoh/article/view/122 https://ijoh.tums.ac.ir/index.php/ijoh/article/download/122/121