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Paper Information

Journal:   JOURNAL OF OCCUPATIONAL HYGIENE ENGINEERING   SUMMER 2017 , Volume 4 , Number 2 ; Page(s) 7 To 17.
 
Paper: 

STUDY OF EXPOSURE TO COLD STRESS AND PHYSIOLOGICAL RESPONSES IN AUTO MECHANICS IN HAMADAN, IRAN

 
 
Author(s):  SAEDPANAH KEIVAN, ALIABADI MOHSEN*, MOTAMEDZADE MAJID, GOLMOHAMMADI ROSTAM
 
* DEPARTMENT OF OCCUPATIONAL HYGIENE, HAMADAN UNIVERSITY OF MEDICAL SCIENCES, HAMADAN, IRAN
 
Abstract: 

Background and Objective: Constant exposure to cold is considered a workplace hazard in cold seasons. We aimed to determine the level of cold stress and its relationship with physiological responses in auto mechanics.
Materials and Methods: This analytical cross-sectional study was conducted in the winter of 2016 among auto mechanics in Hamadan, Iran. Physiological responses were measured in accordance with the ISO 9886 standard method. Body fat percentage was also quantified using Caliper model 01128, and the thermal resistance of the participants’ clothing was calculated in clousing the ISO 9920 standard. Environmental measures such as air temperature and air velocity were measured simultaneously, based on which cold stress indices including wind chill factor and wind chill equivalent temperature were determined. Data were analyzed using SPSS, version 21.
Results: The means of wind chill index, equivalent chill temperature, and minimal required clothing insulation (IREQ) were 489.97±47.679 kcal/m2.h, 13.78 ± 1.869oc, and 2.04±0.246 clo, respectively. According to the results of cold stress indices, the studied employees were exposed to cold stress.
Pearson correlation test reflected a significant relationship between cold stress indices and physiological responses (P<0.05), however, IREQ showed the highest association with the physiological responses of the subjects. Moreover, there was a significant correlation between body fat percentage and core temperature (P<0.05; r=0.314).
Conclusion: The results confirmed that IREQ index has high validity for the estimation of cold stress among auto mechanics. Moreover, the increase of body fat percentage boosts cold tolerance of employees.

 
Keyword(s): AUTO MECHANICS, COLD STRESS INDICES, PHYSIOLOGICAL RESPONSES
 
References: 
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