Showing 8 results for Ebrahimi
Tayebe Rahimi Pordanjani, Ali Mohamadzade Ebrahimi,
Volume 5, Issue 2 (Journal of Ergonomics 2017)
Abstract
Introduction: Nurses as the most important part of human resources in the health service system are often faced with problems associated with shift work. The present study aimed to examine a mediating role of sleep quality in the relationship between workload and physical and mental health among nurses.
Methods: This cross-sectional study was conducted on 236 nurses working in three educational hospitals in Bojnord city. To collect data, the survey of shiftworkers (SOS) questionnaire was used. Data were analyzed using the structural equation modeling by AMOS-21 and SPSS 19 software packages. In addition, the Preacher and Hayes’ SPSS Macro program was used for testing mediation.
Results: The results showed that the proposed model fitted the data properly. Also, workload directly affected only physical health, and the quality of sleep had a mediator role in the relationship between workload and physical and mental health.
Conclusions: Sleep quality as an important variable can mediate the relationship between workload and physical and mental health in nurses. So, it is suggested that interventional interventions to improve the health of the staff be focused on adjusting and shifting job shifts and teaching the principles of sleep hygiene to them.
Rashid Heidari Moghaddam, Mohammad Babamiri, Majid Motamedzade, Maryam Farhadian, Kamal Ebrahimi,
Volume 5, Issue 4 (Journal of Ergonomics 2018)
Abstract
Background: The working station has a major impact on the musculoskeletal disorders, therefore a considerable attention to working station staff is of importance. The aim of this study was to investigate the effect of working station on musculoskeletal disorders among administrative staff.
Methods: 30 administrative staff participated in this analytical descriptive study. Data was collected using Nordic Musculoskeletal Disorders Questionnaire (NMQ) in ergonomic design intervention of three working stations (sitting, standing-and-sitting, standing) before and after of intervention. Moreover, a t-test and multiple regression were used to analyze the data.
Results: The average (standard deviation) of the age and work record of 30 participating employees were 44.3 (5) and 20 (5) years, respectively. There was a significant correlation between the type of working station before and after the intervention, with the expression of musculoskeletal disorders (P=0.02). There was also a significant relationship between variables of musculoskeletal disorders in the shoulders, necks, waist and hands at different working stations. However, there was a significant relationship between age, work experience and BMI index with musculoskeletal disorders.
Conclusion: According to the results of this survey the best working station is a sitting-and-standing. Therefore, by changing the type of working stations, musculoskeletal discomfort of the employees will be reduced appropriately.
Fariba Kiani, Tayebe Rahimi Pordanjani, Ali Mohamadzadeh Ebrahimi,
Volume 6, Issue 1 (Journal of Ergonomics 2018)
Abstract
Background: The majority of research have led to interventions such as stress management design and have neglected the role of psychosocial factors in occupational stress. The aim of current research was to the relationship between occupational stress and health consequences among the workers in regards with the perceived organizational support.
Methods: 211 individuals of Isfahan Steel Company were selected according to the stratified random sampling method and completed questionnaires about demography characteristics, Occupational stress, incident reporting rate and perceived organizational support. The collected data were analyzed by descriptive index and multiple regression analysis using SPSS18.
Results: Results showed that there were significant relationships among perceived organizational support, Occupational stress and incident reporting rate (P<0.05). Also, hierarchy regression analysis showed that the relationship between Occupational stress and incident reporting rate was partially mediated by perceived organizational support (P<0.05).
Conclusion: The results of this study indicate that perceived organizational support can modify the relationship between occupational stress and involvement in work accidents, and as a result, employees are less involved in risk behaviors and accidents are less caused by occupational stress.
Saseed Ilbeigi, Nafise Rastegar, Marzieye Saghebjoo, Ahmad Ebrahimi Etri, Hosein Farzaneh,
Volume 6, Issue 1 (Journal of Ergonomics 2018)
Abstract
Introduction: The purpose of this study was to study the relationship between ergonomic of educational equipments with anthropometrical parameters and upper extremity abnormalities in primary school girl students in Mashhad.
Methods: In this way, 14225 girl students were selected as statistical population, and then 375 subjects randomly were selected as a samples study. Some anthropometrical parameters as; popliteal height, popliteal-buttock length, elbow height from 90° angle, and shoulder height from setting position along with some educational equipments dimension used such as bench height, bench depth, desk height and width were measured. Moreover, upper extremity abnormalities including lumbar lordosis and thorax kyphosis were evaluated by flexible ruler. The related anthropometrical measures along with desk and bench dimensions also were determined in range of accepted limit (AL), over range of accepted limit and below range of accepted limit for each of benches and desks dimension. For statistical analysis the Chi-Square test in contingency tables, Cramer’s phi were used by SPPS version 16 (P<0/05).
Results: The result of this study indicated that the 81/8 percent of benches was higher than max accepted limit of the popliteal height, and 76/8 of students used some desks that was higher than max accepted limit (P<0/05). Bench depth was inappropriate for %100 of students and smaller than min accepted limit. Furthermore significant relationship observed between measure match bench height with popliteal height and abnormalities lordosis and kyphosis (p≤0/05).
Conclusion: The result of present study indicated that educational equipments of the Mashhad schools had no minimum ergonomic standard.
Dr Ehsanollah Habibi, Emad Mirsalimi, Faezeh Darabi, Kamran Ebrahimi,
Volume 6, Issue 4 ( Iranian Journal of Ergonomics 2019)
Abstract
Background and Objectives: This study focused on lifting drill rods. Drilling is a repetitive and heavy mining operation with a high incidence and severity of musculoskeletal injuries. The purpose of this study was to examine how to lift a vertical drill bit (1.61m and 35kg in height) using two types of rod height and four feet positions, and finally compare them with the Lifting Index (LI).
Methods: Seven workers participated in this study. Each person raised a rod and held it vertically. Reflective markers were installed on each person, and from three cameras and an Ergo-meter plate for record forces and Movement of the limbs. In this case, four positions of the foot and pressures on the lower back were Investigated (position0=to the rod, position45=diagonally to the rod, position90=right side of the bar and free posture). In addition, two positions of the height of the rod were Investigated, at the first, the end of rod was on the ground (height of the rod was 83 m), and in the following the end of rod was on the Basket with height 20cm (rod height of 1.03 m).
Results: The Lifting Index (LI) for each person was equal to 1.4 in the NIOSH lifting equation. It was found that the vertical height of the rod had the greatest effect at the load on the lower back. Some workers use techniques that endure less pressure on their waist.
Conclusion: Finally, it was found that the asymmetric loading Condition (90 ° angle) was the worst case compared to the Lifting index and NIOSH standard.
Sedigheh Karimi Avargani, Ali Maleki, Shahin Besharati, Reza Ebrahimi,
Volume 8, Issue 3 (Iranian Journal of Ergonomics 2020)
Abstract
Background and Aim: Carriage of backpack sprayers is an inevitable part of agricultural operations that increases the risk of injury along with undesirable changes in walking mechanics. The purpose of this study is to formulate the muscle moment changes in the hip, knee and ankle for the backpack sprayer operator body.
Methods: In this study, a seven-link sprayer operator model is designed and the moment changes in the hip, knee and ankle joints are evaluated. Data are obtained using Plot-digitizer software. Excel software is used to fit the third degree curve on the data.
Results: In the hip joint, the moment is reduced by changing the angle from zero to 15°. At the end of the swing phase, the moment applied to the hip joint increases with increasing the angle up to 30°. In the beginning of the swing phase, the knee joint starts to open at -55°. At the end of the swing phase, the knee joint releases up to -5 ° and the moment applied to the knee joint increases slowly. The moment applied to the ankle joint increases by changing the ankle angle from -7.5° to 7.5°.
Conclusion: According to the results of this study, amount of moment changes of hip, knee and ankle joint affect the force applied to the backpack sprayer operator body. With the knowledge of the moment changes of joints, practical solutions can be provided to reduce amount of damage to these joints.
Saeed Ilbeigi, Mohsen Ebrahimi, Mohammad Esmaeil Afzalpour, Hadi Moazeni,
Volume 9, Issue 2 (Iranian Journal of Ergonomics 2021)
Abstract
Background & Objectives: The aim of this study was to investigate the ergonomics of armpits and aviators outdoor (park) based on anthropometry parameters of male users.
Methods: Among male users of these outdoor park equipment, 120 people from Tehran and in the age range over 20 years (48.38±16.27) were selected as a sample. The research variables were the dimensions of the devices and the anthropometry of the male users. The plumb line, engineering meter, ruler, goniometer and static anthropometer kit (caliper) were used to measure the dimensions of the devices and the anthropometry of the users (according to Pheasant instructions). Then, according to the standards of ergonomics and bodybuilding, the science of motor biomechanics and the way of installation on the devices, the fit of the devices was evaluated. Descriptive statistics were used to describe the data and single-group t-test (parametric statistics) and binomial statistics (non-parametric statistics) were used to test the hypotheses.
Results: The results showed that there was a significant difference between most of the desired dimensions of the devices with the relevant and optimal dimensions of users (P value<0.05). Therefore, from the anthropometric point of view, these devices are not ergonomic for male users, and it is necessary to adopt a method for the standardization of these devices.
Conclusion: Most dimensions of underarms and outdoor aviators are not ergonomic from the anthropometric point of view of male users. This mismatch can lead to complications and physical injuries to users. Therefore, users should be careful when using these devices and avoid working with devices that do not fit their physical dimensions.
Samira Barakat, Habibollah Dehghan, Hossein Ebrahimi, Behnam Moradi,
Volume 9, Issue 2 (Iranian Journal of Ergonomics 2021)
Abstract
Background & Objectives: Thermal sensation is not a direct sense of air temperature but is related to people's feelings, sensory experience and psychological phenomenon, which can affect their performance, productivity, attitude and sense of satisfaction. The aim of this study was to determine the subjective thermal sensation and its relationship with stress, anxiety, depression and students' cognitive function.
Methods: This study was descriptive-analytical and was performed on 167 male students of Isfahan University of Medical Sciences. Students' subjective thermal sensation was measured on a seven-point scale and ambient temperature and humidity were measured in each student's room. The DASS-42 questionnaire was used to measure stress and anxiety and the "Reaction Timer" device was used to measure the cognitive function. The collected data were analyzed by SPSS software version 20.
Results: Students' stress, anxiety and depression were 40%, 47.3% and 41.3%, respectively. The mean temperature of the dormitory was 20.326 ° C, the mean relative humidity was 56.78% and the subjective thermal sensation of 29.9% of the students were neutral from the ambient temperature. There was a significant relationship between students' subjective thermal sensation and stress, anxiety and mean diagnostic reaction time, color selection, sound selection, number of errors in the diagnostic section and sound selection.
Conclusion: Students' subjective sensation of ambient temperature was obtained as a very important and influential factor because in addition to affecting stress and anxiety, it also had a significant effect on their time of diagnostic reaction and selective.
