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Background and aims: Traffic noise is one of the most important urban noise pollution, which causes various physical and mental effects, impairment in daily activities, sleep disturbances, hearing loss and the impact on job performance. Thus it can reduce concentration significantly and increase the rate of traffic accidents. Some individual differences such as personality types in noise effects, affect on. Methods: Traffic noise has measured and recorded in 10 arterial streets in Tehran, and the average sound pressure level measured was 72/9 duration two hours played for participants in the room acoustics in this study. The sample size consisted of 80 patients (40 cases and 40 controls) who were students of Tehran University of medical sciences. Personality type was determined by using questionnaire Eysenc's Personality Inventory (EPI). The error time movement anticipation before and after exposure to traffic noise was measured by ZBA computerize test. Results: The results revealed that error time movement anticipation before exposure to traffic noise have significant difference for introverts and extraverts, introverts have less error time movement anticipation than extroversion. Where as extroverts have less error time movement anticipation that introversion after exposure to traffic noise. Conclusion: According to results of this study, noise created different effects on the performance of personality type. Extroverts may be expected to adapt better to noise during mental performance, compared to people with opposite personality traits. [ABSTRACT FROM AUTHOR]

Background and aims: Hot and humid conditions are common in many parts of the world; these conditions can influence both the health and performance of individuals. Therefore to describe the environmental conditions appropriately, the amount of reliability of heat stress indices should be measured. The aim of this study was evaluating the reliability of WBGT and P4SR by comparison to core body temperature in an Oil Terminal. Methods: The participants (94 persons) were two groups of acclimatized and not acclimatized employees of different units of the Oil Terminal. After identifying the units and their activities, air and wet temperatures, WBGT, and core body temperature (oral and tympanic) were measured in three situations including outdoor, indoor, and rest activities. Results: The statistically significant correlation was found between above mentioned heat stress indices with oraland tympanictemperatures (p<0/05). The regression equations were shown that the most determinant coefficient belong to WBGT and tympanic temperature (R²=0/571). Conclusion: It was found that the WBGT and P4SR with core body temperature had significant correlations and WBGT had the most accuracy to predict heat stress in employees. [ABSTRACT FROM AUTHOR]