دو ماهنامه سلامت کار ایران
سال پانزدهم شماره 2 (خرداد و تیر 1397)

Despite automation, still many occupations require the use of hand tools in their routine activities. Scissors are essential tools for many workers in different occupations such as sewing and clothes making.The aim of this study was to investigate the effects of three re-designed models of sewing scissors (models A, B and C) on user performance, tool usability and hand and finger discomfort, and to compare their performances against those with traditional sewing scissors (model D).
The prototype sewing scissors were designed based on the results of a pilot study and general ergonomic design principles. Modifications were made to the tool handle so that the model A had a bent-handle, thumb-ring was located closer to the pivot in model B, and the original oval ring was changed to a hook shaped handle in model C. User performance was measured using simultaneous recording of the task completion time and error rate, usability was evaluated using system usability scale (SUS) and hand and finger discomfort was evaluated using a hand map and severity scale.
The results showed significant effect of handle shape on user performance (p Generally, scissors models B and C were comparable and caused some improvements in user performance, tool usability and reduced hand and finger discomfort compared to the traditional model, while no improvement was observed with scissors model A in this regard.

Whole-body vibration is one of the major factors that cause human discomfort and physiological reactions in industrial environments or vehicles. This study aimed in a laboratory environment to investigate the effect of whole body vibration on human discomfort, heart rate and reaction time in men 20 to 30 years old.
40 Male students in Tehran University of Medical Sciences with 26.2± 1.7 years mean of age are participated in this study. All of participants were studied in 4 stages for 20 minutes in four vibration accelerations in x, y and z axis and frequency of 3 to7 Hz including without vibration, 0.56 m/s2, 0.9 m/s2 and 1.25 m/s2 that was produced with vibration simulator. At each stage, a computerized visual reaction time test was taken and reaction times were measured for test and their Heart rate was also recorded using pulse oximetry. At the end of each stage the subjects were given 15 minutes to rest and their discomfort was rated during this time.
The results of this study showed that with increasing whole body vibration acceleration, discomfort rate (P The results showed that whole body vibration is a factor that affects human physiological and subjective functions. Hence, attending to level of vibration transmitted to human in vibrant environments have an important role in decreasing human discomfort and reducing reaction time in quick and sensitive activities.

The Symbolic signs are important tools, designed to convey a message and can transmit a lot of information to the viewer at a glance. Understanding of symptoms is very important especially when they transmit safety information. Signs and symbols have characteristics which affect understanding of them. McDougall et all) 1996(introduced the five key cognitive features of symbolic signs including: concreteness, complexity, meaningfulness, familiarity and semantic distance. This study aimed to assess the validity and reliability of the Persian version of McDougall questionnaire for assessing cognitive features of traffic signs.
The original questionnaire was translated from English to Persian by method of Backward-Forward. 8 experts helped to determine the face validity of the questionnaire .For Content Validity Ratio and Content Validity Index, Lavshy and waltz-Basel methods were considered and also Scale-level Content Validity Index was determined. The questionnaire was designed for 25 signs and 80 subjects participated in this study. The participants subjectively rated five features of each sign from 0 to 100. The reliability and internal consistency of questionnaire were defined by Cronbach's alpha coefficient. Finally, using test–retest and intra-cluster correlation index, stability of questionnaire was reached.
All questions of cognitive characteristics questionnaire had score higher than the acceptable content validity ratio and completely accepted. Content validity index of questionnaire for all the questions were above 0.79 or acceptable score. Scale-level Content Validity Index was 0.928. Inter-cluster correlation index was 0.995 and Cronbach's alpha coefficient was equal to 0.922.
This study showed that the Persian version of cognitive sign features is a reliable tool for evaluating of cognitive features which has high reliability and validity and can be used in the evaluation of cognitive features of traffic signs and the other symbolic signs.

Hospital acoustics, noisy equipment and people have adversely impacts on patient’s physical and mental health. This paper aims to identify the major sources of noise and noise control techniques in hospitals of Behbahan
Noise measurement was done according to ISO9612 at designated stations. Equivalent sound pressure levels were measured at 243 measuring stations in 30 minute intervals. The validated questionnaire was completed for the evaluation of major sources noise among 158 staffs. The Data with SPSS and EXCEL were analyzed. Finally were provided practical suggestions for noise control
The results showed that the maximum equivalent sound levels were 65.8 dB (A), 61.65 dB (A), and 71.1 dB (A) at the Shahid zade, Faride behbahani and Tamin Ejtemaee hospitals respectively. In this paper we shall consider the main source of noise pollution in hospitals were staff and clients, sound of doors, and air conditioning, medical equipment and furniture and beds
This work try to put forward some possible solutions including: Indoor planning, selection of suitable materials, noise control both inside and outside buildings.

Sitting on an unfitted chair can cause disorders of musculoskeletal system. In this study we investigated to determine the match of anthropometric dimension with classroom chairs in the students of 3ed and 6th grades primary school and finally offer the best dimension of the classroom chairs.
572 primary schools students (male and female) were attended in this study which 275 and 297 of them were in 3ed and 6th grade respectively. Some of anthropometric dimensions such as shoulder height, elbow height, popliteal height, popliteal - buttock length and buttock breath were measured. Then anthropometric dimensions were compared with seats dimensions and the appropriate seat dimensions were offered.
results showed all of the seat dimensions were larger than the anthropometric dimensions in the 3ed students. Also in the 6th grade students only seat height were match with popliteal height 85.3 and 84.5% in the girls and boys student respectively. Back rest height and seat depth were the larger while armrest height and seat width were the smaller than the students physical dimensions.
According to the differences in the body dimensions of the third and sixth grade students there are a little difference in the size of their seats. All of the seat dimensions are larger than the anthropometric dimensions in the 3ed students. By reducing of the seat’s size, in addition to the decreasing in the production fee, we can increase match between students’ anthropometric dimensions and seats’ dimensions.

Many investigations with the aim of studying the affecting factor on job stress (JS) were conducted. But it cant be find a study attempted to investigate the impact of Quality of Work Life (QWL), General Health (GH), Physical Activity (PA) and Depression (DE) on Job Stress using Structural equation modeling (SEM). So the aim of the study is to investigate the relationship between QWL, GH, PA and JS with the mediating role of DE.
Methodology was descriptive- correlation and the Data was collected with standard questionnaire that the validity and reliability of them was approved. The Statistical society consist of all the employees of Golestan Gas Corporation that total number of them is 853. So number of 310 of them were selected as statistical sample with classified sampling method. For analyzing data, the SPSS v24 and AMOS v24 was used.
The SEM result shows that there is a significant relationship between QWL, PA and DE with JB (P As the DE mediation effect was approved in this study, the organization can help to decrease the positive effect of QWL and GH on JS through decreasing employees DE and it finally leads to decreasing the level of JS.

Emotional divorce is one of the major threats to family breakdown, so it is important to understanding the factors influencing it. Present research aimed to predicting emotional divorce based on variety seeking, negative perfectionism and insecure attachment among employed women.
This was a descriptive study from type of correlation. The population included all employed married women in governmental offices of Urmia city in 2015 year. Totally 267 person were selected through multistep cluster sampling method and completed the questionnaires of emotional divorce, variety seeking, negative perfectionism and insecure attachment. Data was analyzed with using of SPSS-19 software and by Pearson correlation and multivariate regression with stepwise.
Finding showed a positive and significant relation between variety seeking (r=0/44), negative perfectionism (r=0/36) and insecure attachment (r=0/18) with emotional divorce of employed women. Also the variables of variety seeking, negative perfectionism and insecure attachment significantly can predict 33/6 percent of variance of emotional divorce among employed women (p The results indicated the importance of the variables of variety seeking, negative perfectionism and insecure attachment in predicting the emotional divorce of employed women. Therefore to planning for the prevention of emotional divorce, especially in employed women should be considered the role of mentioned variables.

With the increasing air pollution to volatile organic compounds, in critical demand of a new environmentally, friendly technologies to remove these contaminants from the air stream is of interest to everyone. Photocatalytic processes, including processes, are considered, radiation may be in the future as a new and promising technology used for the removal of vapors volatile organic solvents from the air stream.The aim of this study photocatalytic removal of toluene vapors using zeolite Y is impregnated with nanoparticles of titanium dioxide.
after preparing raw equipment and materials, first titanium dioxide nanoparticles loaded on the substrate of zeolite by wet impregnation method and two grams of the bed was placed in a reactor equipped with UV radiation.Then to help Construction concentration dynamic system, concentrations of 50, 150 and 300 ppm of toluene was prepared and injected into the reactor at the flow rate of 1 liter per minute. In the final stage, By measuring the inlet and outlet of the reactor concentration, The Absorption and removal efficiency of photocatalytic bed prepared were investigated.
photos and graphs obtained through XRD and SEM-EDAX showed that the nanoparticles are well sitting on the outer surface and pores bed. On the other hand, In determining bed performance turned out, By increasing the concentration of 50 to 300 ppm of toluene, bed photocatalytic removal efficiency was decreased, And also the removal efficiency at 50, 150 and 300 ppm, respectively 50, 48 and 20 percent, Was obtained.
The results indicated that use of zeolite is impregnated with nanoparticles of titanium dioxide not suitable for the removal of VOCs from the air stream is, especially in concentrations of 50 to 150 ppm, And given its low operating costs compared to other methods of the catalyst It is recommended that additional studies be conducted in this field.

The jobs are an important part of human life and, in the era of new technology in the world, there are various stresses that some are related to the work environment. Therefore, job stress can negatively affect employees’ physical and mental health. This study was conducted aimed to investigate the relationship between family needs and job motivation with job stress.

study was descriptive and correlational. By using stratified random sampling, 300 participants among the staff of Birjand University of Medical Sciences were selected. With three questionnaires the research variables measured: family needs, job motivation and job stress. The data were analyzed using correlation coefficient and stepwise regression.

The results of the regression analysis showed from the family needs, the needs for psychological services, social security, training and affection, and from the dimensions of job motivation, external demotivation predict significantly 22% of an employee's job stress variance.

The results showed family needs and job motivation have an important role in predicting job stress. Therefore, the job stress could be reduced by resolving the employee's family needs and making motivation.

Poor sleep and fatigue are common problems among the pre-hospital emergency staff. Pre-hospital personnel shift work can have negative effects on job performance, sleep quality, physical health, mental health, drug consumption, and job stress. One of the complementary and nonpharmacologic interventions to reduce sleep disturbances and fatigue is progressive muscular relaxation. Few studies carried on sleep and fatigue in pre-hospital emergency personnel. This study aimed to determine the effect of progressive muscle relaxation on sleep quality and fatigue of pre-hospital emergencies’ staff.
This interventional study (2015) was conducted among the Pre-hospital emergency staff at Center of Accident and Medical emergencies in Golestan province. From the pre-hospital personnel with poor quality of sleep (>5) 72 of them were selected with simple random sampling method and were allocated into the intervention and control groups. In the intervention group the participants practiced progressive muscle relaxation technique twice a day for 45 days. The control group received no special action. Before and after the intervention using the Pittsburgh Sleep Quality and fatigue questionnaire, the quality of sleep and fatigue were examined and compared. The data were analyzed by statistical tests at significance level p There was a significant difference between the score of sleep quality and fatigue of pre-hospital personnel in the experimental and control groups before and after the intervention (P Daily progressive muscle relaxation exercises reduced fatigue and improved sleep quality in the pre-hospital emergency staff. Hence, muscular relaxation as a cost effectiveness and easy to learn technique can be apply for the mentioned issues among pre-hospital personnel.

Working in hot environments is one of the common physical risks factor in the workplace, which can also cause heat-related illnesses and various health effects on workers, and also increasing the risk of injuries and occupational accidents. The purpose of this paper is review conducted studies about heat stress in different countries, investigation the indices of heat stress, the characteristics of the exposure in hot environments, high-risk occupations, and sutvey the status and importance of these studies.
In this review study used Web of Science, Scopus, Pubmed, ScienceDirect, Iran Medex, Magiran, Google Scholar and SID databases. The keywordsincluded Heat stress, heat exposure, heat waves, workplace, knowledge and attitude of workers about heat stress, the period of 2000 to 2015 was investigated, and finally 103 original articles were identifed.
90% of all study being cross-sectional studies, 41% being related to outdoor workplaces, and 42% being related to indoor environment. Most studies were carried out in the tropical zones.19 studies were about perceptions and behavioural responses of exposure to heat stress.A range of heat indices were used with 60 (71%) studies using Wet Bulb Globe Temperature Index (WBGT). Most of studied focused on manufacturing workers and farmers. Most of studies indicated that workers were suffering from heat stress and strain.
The results of studies showed that stress in workplace is worrying due to the nature of the working processes both indoor and outdoor, and of climate change. Therefore it is necessary to considering preventive and control programs to reduce the heat stress by the management and staff's participation to eliminate or reduce its lethal effects.

Today, the importance of research in the field of organizational virtuosity is of great importance with the new approaches to positive psychology in the field of work and the role that organizational virtue plays in the cultivation of emotions and positive interactions in organizations. This study aimed to investigate the relationship between psychological empowerment and organizational Virtue with the role of mediator work-related flow in Lorestan University of Medical Sciences.
The present study was correlational structural equation modeling. The study population included all employees of the lorestan University of Medical Sciences in 1395 that 230 of them stratified sampling based on Cochran formula were chosen. Data collection tools include questionnaires, psychological empowerment Spritzer and Mishra, work-related flow Baker and organizational Virtue Cameron et all. To analyze the data, correlation and fit indices were used or the use of spss and amos software version 18 was used.
This model was evaluated using structural equation modeling. The results showed a positive and significant effect psychological empowerment on work-related flow and organizational Virtue. The work-related flow significantly positive effect on organizational Virtue (P The results of this study indicated that psychological empowerment and work-related fascination are good predictive factors for organizational virtue; psychological empowerment and work-related fascination make people more responsible in the organization and To increase their positive interactions to enhance organizational excellence, the organization should provide the necessary field for training and strengthening these variables.

Professional nursing is a high risk of developing varicose leg. Threfore the aim of this study was to determine the effect of education based on health belief model on preventive behaviors of Varicose vein in nurses.
This is a quasi-experimental study that was carried out on 100 nurses were selected and divided randomly into two case and control groups. Participants in two stages (before and three months after treatment) were tested. Educational intervention through lectures, question and answer booklets were held. Data ghathering with questionnaire was a researcher made based on the health belief model and the data were analyzed with the use of statistical tests chi-suare, T-test, T-paredtest.
Funding showed that 3 months after intervention, construct of health belief model significant difference in the intervention group compared to the control group (p The based on results of this study showed that an educational program Health Belief Model and activity education on the adoption of preventive behaviors among nurses Varicose vein effective, so that it is suggested training programs based on behavioral theory of alternative training programs is routine. Moreover the prevention techniques in the form of academic courses, educational content such as posters and films, holding conferences for the prevention of varicose veins.

Knowledge of safety attitude is very important for managers of organizations, because it can be used to predict their employee safety behaviors. In this way, a further exploration about safety attitude and knowledge of workers as well as the relationship among the affecting factors is required. This study aimed to investigate the relationship between safety attitude and knowledge of workers and WAI in one of the large hospitals in Tehran.
The research is cross-sectional and has been used of a random sampling method by a sample size of 340 people. In order to measure of safety attitudes and knowledge, Kumar questionnaire has been used, and the Occupational Safety and Health Institute of Finland WAI questionnaire has been used to evaluate WAI. Data analyses are also performed using SPSS 22 statistical analysis package.
This study showed that mean of safety attitude and knowledge is 6.1 ± 39.7, and most people (45.3%) are in the category of good WAI. Also, with increasing age and work experience, safety attitude and knowledge and work ability index is reduced. There was no significant relationship between education and work shifts and the safety attitude and knowledge and WAI. Occupational health and safety training courses, increase safety knowledge and attitude and work ability index.
WAI has a significant relationship and direct and severe correlation with safety knowledge and attitude. Also educational courses in the field of occupational safety and health can be enhanced employee safety attitudes and knowledge toward safety.

Particles in the Breathing air composting Complex because of the diversity of waste, are Carrying dangerous chemicals compound such as metals. The aim of this study was determine the sources and health risk assessment of metals.
In order to measuring the particle, frm OMNITM Ambient Air Sampler was used. Sampling in the months of February and March 2016 was performed in Processing, aeration and filtration sites. For analysis of heavy metals and sources determined, ICP1-AES and Enrichment factor were used respectively
In this study the average concentration of PM10 particles in Processing, Refinery and aerated Site were 1291, 3557,143 µg/ m3 respectively. The highest concentrations of metal in PM10 particles of aluminum and iron, 73.07, 44.71 µg/ m3 for refining site was obtained respectively. In this study, the additional cancer risks of metals, in refining, processing and aeration was found respectively and all of the cancer risk was higher than the limit set by the Environmental Protection Agency.
The results of this study show that due to the lack of information in the field of measuring particle concentrations on composting in order to study the effects of pollutants on those exposed, investigations of Monitoring study in different parts of the composting facility is necessary.