title: The effects of heat stress on a number of hematological parameters and levels of thyroid hormones in foundry workers.
abstract: The objective of this research was to determine the effects of heat stress on some hematological parameters and thyroid hormones among foundry workers. This study was performed on 25 heat-acclimated subjects while 10 office workers were selected as the control group. Wet bulb globe temperature (WBGT) was determined to estimate the heat stress. Blood sampling was conducted before and after the daily work shift. The mean value of the WBGT index was 35 °C. The levels of plasma osmolality (p = 0.04) and white blood cells (p = 0.03) in the case group (before exposure to heat) were significantly higher than those in control group. No significant differences were observed between the average levels of T3 (p = 0.79) and T4 (p = 0.17) hormones between two groups. A positive relationship was found between the variation of some hematological parameters and thyroid hormones with WBGT index and air temperature.
authors.affiliation: a Department of Occupational Health Engineering , Shahid Beheshti University of Medical Sciences , Iran.
authors.forename: Sahar
authors.initials: S
authors.lastname: Norloei
authors.affiliation: a Department of Occupational Health Engineering , Shahid Beheshti University of Medical Sciences , Iran.
authors.forename: Mohammad Javad
authors.initials: MJ
authors.lastname: Jafari
authors.affiliation: b Department of Occupational Health Engineering , Tehran University of Medical Sciences , Tehran , Iran.
authors.forename: Leila
authors.initials: L
authors.lastname: Omidi
authors.affiliation: c Department of Epidemiology , Shahid Beheshti University of Medical Sciences , Iran.
authors.forename: Soheila
authors.initials: S
authors.lastname: Khodakarim
authors.affiliation: d Department of Oncology , Shahid Beheshti University of Medical Sciences , Iran.
authors.forename: Davood
authors.initials: D
authors.lastname: Bashash
authors.affiliation: a Department of Occupational Health Engineering , Shahid Beheshti University of Medical Sciences , Iran.
authors.forename: Mohammad Bagher
authors.initials: MB
authors.lastname: Abdollahi
authors.affiliation: e Department of Pathology , Shahid Beheshti University of Medical Sciences , Iran.
authors.forename: Mina
authors.initials: M
authors.lastname: Jafari
mesh_terms: D000064:Acclimatization / Q000502:physiology; D000328:Adult; D018882:Heat Stress Disorders / Q000097:blood*; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D007492:Iran; D007958:Leukocyte Count; D008297:Male; D008669:Metallurgy; D009784:Occupational Diseases; D016273:Occupational Exposure / Q000009:adverse effects*; D010949:Plasma / Q000737:chemistry; D013963:Thyroid Hormones / Q000097:blood*; D017132:Workplace
chemical_list: D013963:Thyroid Hormones
keywords: WBGT index; exposure; heat stress; hematological parameters; thyroid hormones