Iraj Alimohammadi

Iran University of Medical Science, Iran, tehran · Occupational health Engineering

Introduction: light intensity and duration are physical factors that affect hormone secretion and circadian rhythms. This study aimed to determine the effects of various light intensities on serum melatonin and cortisol levels. Materials and methods: This experimental study was carried out on 32 male rats: Group 1 as the control group, received a...

Objective: Environmental stressors such as physical and chemical factors can have a destructive testicular function. The present study aimed to determine the effect of concomitant exposure to lead and noise on testicular tissue in male rats. Materials and methods: Twenty male Wistar rats (250-300 g, 12-13wk) were divided into four groups (n=5/each)...

The aim of this study is to determine the relationship between knowledge and attitude toward using hearing protection devices as a safe behavior. Also, it is intended to analyze the role of individuals and job characteristics on using earplugs or earmuffs. In this study, workers participated from 16 printing industries located in five areas of Tehr...

Introduction: Musculoskeletal injuries are one of the most common causes of work-related illnes, reimbursement and absence among workers in working environments throughout the world. Among various factors, exposure to vibration is one of the main causes of these injuries. The aim of this study was to investigate the effect of key factors on the occ...

Regarding the significant share of the automotive industry in both producing economic value added and employment, this sector is dominated in the industrial development approach. On the other side, different societies have focussed on the emissions, energy consumption and also waste production of road transportation as important risk threatening en...

The performance of any management system needs to be monitored with adequate and proper indicators. This study aimed to identify, set priorities and assess key indicators for implementing an effective performance evaluation system. This descriptive-analytical study was carried out in three phase. In first phase, a semi-structured interview as well...

The performance of any management system needs to be monitored with adequate and proper indicators. This study aimed to identify, set priorities and assess key indicators for implementing an effective performance evaluation system. This descriptive-analytical study was carried out in three phase. In first phase, a semi-structured interview as well...

The performance of any management system needs to be monitored with adequate and proper indicators. This study aimed to identify, set priorities and assess key indicators for implementing an effective performance evaluation system. This descriptive-analytical study was carried out in three phase. In first phase, a semi-structured interview as well...

Considering the relationship between occupational burnout and oxidative stress, identifying the factors that affect occupational burnout, such as recognizing individual characteristics, would be beneficial for implementing strategies to reduce oxidative stress levels. This study was conducted on 92 nurses from a hospital in Shahroud, a city in nort...

Background: Human errors cause accidents in the workplace. Screening workers at employment can prevent future accidents from happening. Two important tools that can be helpful in screening are determining the emotional intelligence score and personality traits score of the workers. Objective: The purpose of this study was to evaluate the relatio...

Objective: Due to the growing use of communication instruments such as cell phones and wireless devices, there is growing public concern about possible harmful effects, especially in sensitive groups such as pregnant women. This study aimed to investigate the oxidative stress induced by exposure to 900 MHz mobile phone radiation and the effect of v...

Noise is considered as one of the most influential physical factors in working environments. The advancement of industries has made it a threat to the physical and mental health of individuals on a global scale. Over the past twenty years, there has been strong evidence of a relation between the impact of external factors, lifestyle, and socioecono...

The way workers perceive noise exposure can play an important role in the adoption of safety behaviors. Therefore, the determination of the relationship among risk awareness, behavior, and exposure can be an extremely important issue in controlling noise exposure. The aim of this study was to investigate the association between risk perception and...

Background: Chronic exposure to noise in workplaces is one of the most important physical agents that affects workers' health and causes social and individual problems. The aim of this study was to investigate the relationship between noise annoyance and blood pressure (BP) of workers of an automotive industry. Methods: In this cross-sectional s...

Noise is one the most common health hazards in the workplace. Noise-induced annoyance, as a measurable mental response, is one of the most significant adverse effects of noise. The level of annoyance from environmental noise is affected by several non-acoustic factors such as personality traits, hearing sensitivity, or attitude. The purpose of this...

Background The noise annoyance depends on two factors including noise source and psychological and internal processes of the receiver person. Due to the importance of noise annoyance and the potential impacts of personality traits on that, this study aimed to model the effect of big five personality traits on noise sensitivity and annoyance. Mater...

Background: Noise is considered as one of the most significant and dangerous physical factors in work environments, and due to the advancement of industries, it has become a threat to physical and psychological health in the current era. In addition to its undesirable effects on the hearing system, noise can have harmful non-auditory effects that m...

As the most of work-related accidents results from unsafe behaviors, there is clearly a need for research in this area. The purpose of this study was to assess safety culture among operation personnel of an Oil Refinery Company (ORC) in Tehran and design and implement a Safety Culture Promotion Intervention Program (SCPIP) based on an integration o...

Background: Driving accidents are global challenges, especially in developing countries, that have been introduced by the World Health Organization (WHO) as one of the significant reasons for endangering human health. The most important reasons for driving accidents are the behavior and psychological characteristics of the vehicle driver. Aberrant...

The noise exposure causes the secretion of different stress hormones, including cortisol. Since noise annoyance does not depend just on the level of noise, the main objective of this study was to examine the relationship between noise annoyance and salivary cortisol levels based on individual variables. 78 individuals from a car manufacturing compa...

Regarding the important role of occupational health in the continuous improvement of organizations, the aim of this study was to identify, select and prioritize key indicators for improvement of occupational health in an automotive company. This cross-sectional descriptive study was carried out in three stages. First, a semi-structured interview as...

Background and Objectives: Nearly 16,000 people are killed in driving accidents in Iran each year. The purpose of this study was, therefore, to determine the effect of age on driving performance, using a driving simulator. Methods: This cross-sectional study was carried out on 16 young drivers, 16 middle-aged drivers, and 16 elderly drivers in Tehr...

Among the most important complaints of people exposed to noise are the feelings of resentment and annoyance, and the changes in mental conditions, which are among the main psychological consequences affecting the concentration and accuracy of workers. This study was designed to investigate the relationship between annoyance and cognitive performanc...

Introduction: Noise is an environmental stressor and can cause or exacerbate mental disorders, and affect the individual performance in certain conditions. This study aimed to evaluate the combined effects of noise and smoking on the cognitive performance of the workers in the automotive industry. Methods: This research is a descriptive-analytical...

Introduction: Exposure to noise is considered as one of the most important health problems in various industries, especially pharmaceutical industry, which can ultimately lead to significant negative effects on labor force and occupational performance. The aim of this study was to investigate the relationship between continuous noise exposure and o...

A Comparison of Early Versus Late Nap Times During the Night Shift Regarding the Psychomotor Performance Required for Safe Driving: A Pilot Study Background: Sleep deprivation leads to fatigue and sleepiness among health care workers and can result in road traffic collisions (RTC) after their shift. Planned napping is one of the main solutions pr...

Background: Undoubtedly, lack of good quality sleep is a major problem for students, affecting their educational success causing them academic failure. Therefore, this study is carried out aiming to determine sleep quality and its relation with educational status of Iran University of Medical Sciences students. Methods: This study is a sectional-an...

Background and Objectives: Studies have shown the effect of smoking on mental and cognitive performance of the individuals who need to concentrate on their work. The present study aimed to investigate the effect of smoking on cognitive performance of the automotive industry workers. Methods: In this case-control study conducted in 2018, 280 automot...

Background: Lead is a major environmental pollutant and can adversely affect humans and animals. There are conflicting data about the ototoxic effect of lead. This study experimentally examined the association between blood lead levels (BLL) and the subsequent hearing impairment in male rats. Methods: Twenty-two male rats were randomly categorized...

Purpose Noise is one of the most important problems in the workplace. The main adverse effect of exposure to this physical pollutant is the hearing loss. For preventing such adverse effects, the use of hearing protective equipment is recommended. Despite the simplicity, hearing protective equipment can affect the correct perception of the words in...

Background Extrovert and introvert subjects’ attention levels are affected by exposure to noise. The aim of this study was to investigate the effects of stress (noise) on selective attention of university students. Methods Exposure to 80 dBA noise was used as a stimulus condition in this study. Eysenck Personality Questionnaire (EPQ) was used for...

Introduction: Working in noisy environments may cause hearing loss. Studies have shown that some factors along with noise are independently involved in hearing loss, one of which is cigarette smoking. The aim of this study was to evaluate the effects of smoking on hearing loss in workers exposed to occupational noise. Materials and Methods: The wor...

Introduction: Both auditory and non-auditory health can be affected by exposure to occupational noise. The aim of this study was to evaluate the association of high occupational noise (at three levels) with systolic blood pressure (SBP), diastolic blood pressure (DBP) and salivary cortisol concentration in an automotive factory. Methods: This st...

Background: Noise pollution is one of the important harmful physical factors in work environment in developed and developing countries. It not only causes a variety of physiological effects, but also accounts for psychological disorders. Objective: To investigate the effects of chronic exposure to noise on aggression in automotive industry worke...

Background and aims: Speeding and deviation to the left and right are the most notable and important causes of injuries that caused by traffic accidents in most countries. Injuries caused by these events are so great that it will be remembered as a war on the road. Due to the importance of the relation between aggression, errors and violations, thi...

The public concern of harmful effects of radiofrequency radiation exposure, especially with rapid increase in the use of wireless and telecommunication devices, is increasing. Some studies show fetal and developmental abnormalities as the result of radiofrequency radiation exposure. We aimed to investigate possible teratogenic effects of radiofrequ...

Abstract Background: Hands-free cell phone conversation (HFCC) while driving is a common practice among drivers. Several studies have revealed that HFCC, while driving, is no safer than hand-held cell phone conversations (HHCC). This study was conducted to explore the influence of HFCC on the psychomotor performance of drivers. Methods: In this qua...

Purpose Traffic noise can impair mental performance. The aim of this study was to evaluate the impact of traffic noise on the participants' mental performance. Methods Thirty-five male students participated in this study. The Eysenck questionnaire was used to assess personality traits (neuroticism and extraversion) of the subjects. The participant...

Background and aim Driving after a night shift imposes a risk on health care professionals and other road users. The aim of this study was to measure psychomotor performance of driving of night shift nurses compared to day-shift nurses. Methods Forty-seven volunteer female nurses working at Sina hospital in Tehran, Iran, with a call in all departm...

Background: Background: Conversation over the cell phone while driving is a known risk factor for road traffic crash. Using handsfree to talk on the cell phone may remove visual and manual distraction yet not the cognitive distraction. Objectives: The purpose of this study was to better understand the mechanisms of cognitive distraction due to hand...

مقدمه: بی نظمی یا به عبارتی بهتر تاخیر یک تا دو هفته ای در آغاز هر نیمسال تحصیلی بواسطه عدم حضور دانشجویان یا اساتید در کلاس ها، یکی از معضلات بسیار متداول در اکثر دانشگاههای ایران است. این پژوهش با هدف بررسی علل بی نظمی در شروع نیمسال تحصیلی از دیدگاه کارشناسان آموزشی چند مرکز دانشگاهی انجام شده است. 94 در سه دانشگاه علوم پزشکی بابل، شهید بهشتی و...

Purpose There are few and controversial findings about adverse effects between the low frequency noise (LFN) and high frequency noise (HFN) on human. Although noise is presumed as a distracting stimulus, regarding controversial findings between performance effects of LFN and HFN, and scarcely studies on dissimilar effects of them, the present study...

Background and aims: One of the innovative technologies for air pollution control is non-thermal plasma. The dielectric barrier discharge reactor is one of the reactors that applied in non thermal plasma technology for air polluation control. In dielectric barrier discharge reactor, the distance between the electrodes for electric discharge is low...

Introduction: One of the possible effects of occupational exposure to high noise is high blood pressure and cardiovascular disease. Aim of this study was to investigate the association between noise with blood pressure and heart rate in an automotive industry. Methods: 78 male workers who worked in an automobile factory, were participated. Blood p...

The non-thermal plasma (NTP) technique, which suffers from low selectivity in complete oxidation of volatile organic compounds to CO2 and H2O, creates unwanted and harmful byproducts. NTP in concert with photocatalyst can resolve this limitation due to additional oxidation. TiO2 and ZnO nanoparticles were coated on the surface of the expanded graph...

Introduction: Occupational noise is among the most critical occupational hazards, which, in addition to hearing loss, can cause other adverse consequences on an individual's physical and mental health. Long-term exposure to noise can affect blood and biochemical parameters and subsequently lead to increased risk of cardiovascular disease. This stu...

Background: Traffic noise is one of the main important sources in urban noise pollution, which causes various physiological and psychological effects that can cause disturbs in performance, sleep disturbances, hearing loss and impact on job performance. This study was conducted to verify the impact of road traffic noise on reaction time in terms o...

Background and aims: Traffic noise is one of the most important environmental pollutants. World health organization has determined the health effects of community noise including cognitive performance disorders. The aim of this research was to study the effects of road traffic noise on peripheral perception and choice reaction time performance driv...

This paper presents a technique for identifying the best efficient method of noise reduction (BEMNR) by fuzzy expert system in the reverse osmosis (RO) water unit at Fajr petrochemical complex located in south west of Iran at north west of Persian Gulf shore. For this purpose seven methods have been chosen through consultation with health, safety,...

It is believed that improved safety culture/climate is a fundamental element to accident prevention. Therefore, development a scale to assess safety climate is a step towards accident control. The purpose of this study was to construct a Persian safety climate questionnaire. The study took place in Tehran and Esfahan oil refineries in Iran in 2010....

Generally, no industry can be found to be safe in terms of noise pollution. Noise is the wide- spread form of environmental stressor in the industrialized urban areas. Aim: the purpose of this paper is to evaluate the combined effect of workplace noise and smoking on some hematological parameters on employing work in a food manufacturing plant. Thi...

Background and aims: Traditionally in any event, the judgment was usually based on human error and accidents and according to the latest statistics published in Iran the main cause of accidents is unsafe acts and recklessness. The aim of this study was to investigate the factors influencing safety culture in detergents and cleansers units and its r...

Background Noise is one of the more widespread pollutions of road transportation system, which can cause deterioration in performance. This experimental study was designed to assess the effect of road traffic noise on performance with regard to extra/introversion and sex of participants. The personality trait of extra/introversion has been remarked...

Low frequency noise (LFN) as background noise in urban and work environments is emitted from many artificial sources such as road vehicles, aircraft, and air movement machinery including wind turbines, compressors, and ventilation or air conditioning units. In addition to objective effects, LFN could also cause noise annoyance and influence mental...

Background and aims: Technique of Failure Modes Effects and Criticality Analysis, FMECA, is a method for identifying and analyzing all potential failure modes of a system.This technique is used to prevent failures and to reduce their effects on the system. The main goal of this study was identifying and analyzing of the potential failure modes and...

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 reliabilit...

Background and aims: Respiratory diseases due to work with 50 million annually incidence included one third of all occupational diseases and it is one of the main causes of absenteeism from work in workers. Some occupational diseases can be prevented with personal protective equipment. BASNEF model is one of the effective health education and safet...

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 differ...

Background and aims The influences of Low Frequency Noise (LFN) on mental performance have been the objectives of many papers in recent years. Many researchers believe that the LFN even at low pressure levels has impacts on mental performance. In the present work the influences of LFN and Reference Noise (RN) at two different sound pressure levels...

The purpose of this study was to assess the relationship between psychological stresses and noise stresses on printery workers in Tehran, Iran. Hence, 267 workers were randomly selected. The Leq and Lmax were measured and the psychological stresses such as depression, anxiety, aggression and job satisfaction were also studied by the relevant questi...

Background and aims: As a Development of Industrial process, human, environment, equipment, material and validity of system has been exposed to hazardous conditions. Regards of 32.3 percent of occupations in industries, this study focused on risk assessment of foundry unit by energy trace and barrier analysis (ETBA) method and presented approaches...

The effect of personal and attitudinal factors, noise level, hearing status and psychological traits on traffic-related noise annoyance among white-collar employees working in Tehran has been carefully analyzed. This survey has been conducted by interviewing 495 citizens working in non-manufacturing industries in Tehran, using questionnaires, Weins...

Introduction and fundamentals of occupational health

Introduction and fundamentals of occupational health

AbstractBackground and Purpose: Although the evolution of industrial systems toward digital technologies decreased the exposure to high levels of noise, it has created some problems encountered with low level and provoking noise (low frequency noise). In the present work, the mental performance of students exposed to low frequency and reference noi...

The noise emission level associated with two types of speed reducers has been investigated numerically and experimentally for different dimensions and different speeds of vehicle (20, 40 and 60 km/h) and zero acceleration. Numerical analysis has been performed using an FEM method in the ANSYS environment. The experiments show that for a bump of hei...

Background and aims: The Rula procedure was based on the model of OWAS which, developed by the Finish Institute of Occupational Health and the Ovako Steel Company to investigate problems of lifting and of back injuries. This process required that segments of the body by judged on a simple scale, producing a sequence of numbers which were matched ag...

Occupational health in hot working environment, prevention and Control

This study investigated the reli-abilities (internal consistency, split-half, and test -retest) and validity of Weinstein noise sensi-tivity scale in 287 non-industrial employees for the age range 17-76 years (Mean=34.17 years) in Tehran. Cronbach's alpha was found to be 0.62 for part І, 0.68 for part ІІ, and 0.78 for total WNSS scores. Test-retest...

This study was aimed to examine the reliability of traffic noise estimate and measurement techniques in highways of Tehran, capital of Iran. The multiple regressions showed that the traffic flow and the distance from the effective source position are the most important factors to estimate the L10 (1h). Traffic flow, traffic composition in terms of...