Showing 29 results for Rashid
Rashid Heidarimoghadam, Ali Akbar Khasseh, Hossein Vakilimofrad, Abbas Fattahi, Mohammad Reza Amiri,
Volume 9, Issue 2 (Iranian Journal of Ergonomics 2021)
Abstract
Background & Objectives: Every scientific activity needs to know the previous related scientific activities so that its various aspects can be better investigated in order to obtain a richer intellectual heritage. So this article aims to identify and analyze the historical origins of ergonomics using two scientometric techniques named RPYS and RPYS-Co.
Methods: This applied research was conducted in a scientometrics method. The research data consists of 31239 articles in the field of Ergonomics which were indexed over the 20-year period (2000-2019) in Web of Science database. After extracting all the references of these articles, the results were analyzed using the CRExplorer software.
Results: Results showed that in the field of ergonomics, from 1700 to 2000, a total of 19 mutations occurred in the two periods of 1900-1700 and 2000-1900. The article "the information capacity of the human motor system in controlling the amplitude of movement" by Fitts (1954) was recognized as an outstanding and index work. According to RPYS-CO results, the most co-citations with index work are related to the works of 1997 and 2004, which are on Fitts Law.
Conclusion: In the period of 1700 to1900 influential works were related to psychology, biology and economics, and during 1900-2000 influential works were related to psychological theories, work environment and research methodology.
Fakhradin Ghasemi, Rashid Heidarimoghadam, Payam Khanlari,
Volume 9, Issue 3 (Iranian Journal of Ergonomics 2021)
Abstract
Background and Objectives: Hospital and medical staff use medical gloves to protect themselves and their patients from infectious agents. Wearing gloves may reduce manual dexterity and grip strength and interfere with work performance. The aim of this study was to investigate the effect of wearing medical gloves on grip strength, manual dexterity, and perceived comfort.
Methods: 20 people (10 women, 10 men) participated in this study. Participants were tested in three gloveless modes, with latex gloves and with nitrile gloves with two tests, a 9-hole pegboard and a modified pegboard. Perceived comfort in working with gloves, wearing and removing gloves was also assessed using a subjective scale.
Results: The age range of participants was 20 to 40 years with an average of 29.45 years. There was a significant difference in manual dexterity between gloveless hands and nitrile gloves in the 9-hole pegboard test. In the modified pegboard test, gloveless hand manual dexterity was significantly different from both latex and nitrile gloves. The results also showed that wearing any type of glove significantly reduced the grip strength of individuals. The worst comfort rating was given to wearing gloves.
Conclusion: The results of this study showed that wearing gloves reduces manual dexterity and grip strength. A modified pegboard test is also recommended to assess the manual dexterity of medical gloves. Latex and Nitrile gloves are difficult to wear and should be considered in designs.
Parichehr Rashidi-Molkesari, Mohsen Gorgani-Firoozjaei, Shahnaz Tabatabaei, Fatemeh Chaharaghran,
Volume 9, Issue 4 (Iranian Journal of Ergonomics 2022)
Abstract
Background and Objectives: Musculoskeletal disorders and low quality of life are the most common problems among paddy farmers in the world. Paddy farmers are exposed to inappropriate postures, long working hours and stressful environmental conditions. The aim of this study was to compare different farming methods of rice cultivation (traditional and semi-modern) on the prevalence of musculoskeletal disorders and life quality of paddy farmers.
Methods: This descriptive-analytical study was conducted in rice fields with 150 paddy farmers as a sample group (100 traditional paddy farmers and 50 semi-modern paddy farmers). Musculoskeletal disorders and quality of life were assessed using the Nordic questionnaire and the Lancashire Quality of Life Profile, respectively.
Results: The prevalence of musculoskeletal disorders in the neck, lower back and shoulders is higher in traditional paddy farmers compared to farmers who work in semi-modern rice cultivation system. Present results demonstrated that there was no significant difference between various rice cultivation methods and musculoskeletal disorders on life quality. Furthermore, different farming methods of paddy cultivation have no significant effect on paddy farmers' life quality.
Conclusion: The prevalence of lower back musculoskeletal disorders among paddy farmers portrays the consequence from long-term exposure to inappropriate posture from strenous activity.
Payam Khanlari, Noorzaman Rashid,
Volume 10, Issue 1 (Iranian Journal of Ergonomics 2022)
Abstract
Omid Kalatpour, Rashid Heidarimoghadam, Iraj Mohammadfam, Maryam Farhadian, Mohammad Reza Tavakkol,
Volume 10, Issue 2 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: Risk-taking is a personality trait which plays a part in the occurrence of work-related accidents. For this reason, people who are highly risk-taking whose decision might cause accident should not be employed in critical situations. The purpose of this survey was to design and verify the validity of the risk tolerance questionnaire, suitable for control room operators, through examining the event related potential (ERP).
Methods: At first, the questions were selected from reliable scientific resources based on the conceptual model. The questions of the initial questionnaire were selected based on face validity, and then the questionnaire was filled out by 178 control room operators. At the next step, the best questions of the questionnaire were extracted using exploratory factor analysis (EFA). In terms of reliability, 42 individuals of the study group refilled in the questionnaire again after three months as a test-retest. The ERPs were assessed using electroencephalography along with Balloon Analogue Risk Task (BART). The correlation coefficient calculated between the ERPs, and risky behaviors, and questionnaire scores.
Results: One factor and 13 questions were identified as the best questions regarding EFA. Cronbach's alpha was 0.91. The Spearman correlation coefficient was calculated between the questionnaire score and risk-taking behavior as well as between the questionnaire score and P300, which was 0.38 (P = 0.01, η2 = 0.70) and 0.63 (P = 0.01, η2 = 0.99), respectively.
Conclusion: The Operator control Room Risk-Taking (ORTQ) questionnaire consists of 13 questions which can be used as an appropriate tool to assess the risk-taking trait in control room operators and also for research purposes. This questionnaire has got three personality dimensions including risk-taking nature, impulsivity and venturesomeness.
Rashid Heidarimoghadam, Alireza Mortezapour, Khadijeh Najafighobadi, Hamid Saeednia, Saeedeh Mosaferchi,
Volume 10, Issue 3 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: The importance of surgery and its high workload are not hidden from anyone. So far, various studies have been conducted with the NASA-TLX instrument and other commonly used instruments to measure surgeons’ workload. The present study seeks to investigate the relationship between the mental workload of surgeons and their productivity through the validation of specialized tools for this job in Iranian culture.
Methods: After checking the validity and reliability of "SURG-TLX" and productivity tools, they were utilized among 60 surgeons to investigate the relationship between their workload and productivity (WHO-HPQ tool). Content validity indices, Cronbach's alpha coefficient and Spearman's correlation coefficient were used to analyse the results.
Results: Both tools had good validity and reliability in Iranian culture. The results of the relationship between mental workload subscales with different dimensions of productivity showed that some dimensions of mental workload including mental needs (correlation coefficient -0.65 and significance level 0.02), physical needs (correlation coefficient -0.54 and significance level 0.04) and time requirements (correlation coefficient -0.44 and significance level 0.02) had a reverse and significant relationship with the overall productivity score. Despite the reverse relationship between the other dimensions of mental workload and the overall productivity score in surgeons, this relationship was not statistically significant. The results indicated a reverse and significant relationship between some of the mental workload and some of the productivity subscales.
Conclusion: In addition to the possibility of using these tools in the future studies in Iran, due to the direct relationship between workload and productivity in surgeons, measures can be taken to maintain the workload at a standard level and prevent the reduction of their productivity.
Mohammad Babamiri, Ramin Rahmani, Rashid Heydari Moghadam, Mehraneh Shabani,
Volume 11, Issue 2 (Iranian Journal of Ergonomics 2023)
Abstract
Objectives: In work environments, job stress is the main factor that can make employees lose control and provide the opportunity for the occurrence of aggression in employees. Therefore, this study investigated the role of the effort-reward imbalance model in the occurrence of bullying in the workplace.
Methods: This study was descriptive-analytical in nature. The research population consisted of employees of one of the petrochemical plants located in the south of the country. The samples (n=202) were selected using the census sampling method. In this research, two self-report questionnaires, namely the Effort-Reward Imbalance Scale and the Questionnaire of bullying actions, were used to measure the variables. Data analysis was performed using SPSS 18 software using Pearson’s correlation coefficient and linear regression.
Results: The mean scores of the participants’ age and work experience in this study were 40.13±9.32 and 15.9±9.50 years, respectively. Among the participants, 72.8% were female and 86.1% were married. In terms of educational status, 10.9% had an associate's degree, 81.2% had a bachelor's degree, and the rest had a master's degree or higher. About three-quarters of the participants were public service employees, and the rest were working on a contract basis. Based on the results of the multivariate regression model, among the variables investigated in this study, effort-reward imbalance and extreme commitment were able to significantly predict the changes in the bullying score (P<0.001).
Conclusion: Employees who feel imbalanced between inputs and outputs in the job, as well as those who have the characteristic of excessive responsibility, are more likely to display negative behaviors in the form of bullying in the workplace.
Shiva Mohammadjani Kumeleh, Mohammad Amin Rashidi, Azim Akbari,
Volume 12, Issue 4 (Iranian Journal of Ergonomics-In Press 2025)
Abstract
Objectives: Administrative employees are often at risk of developing musculoskeletal disorders due to prolonged computer use. Additionally, frequent interactions with clients expose them to a high mental workload and job stress. The present study aimed to assess the prevalence of musculoskeletal disorders, mental workload, general health, and job stress among administrative employees to improve their working conditions.
Methods: The present work followed a cross-sectional descriptive-analytical method and was conducted on the administrative employees of an engineering company in 2021. Finally, 119 individuals participated in the study using the census method. Demographic information questionnaires, as well as Rapid Office Strain Assessment (ROSA), Cornell, NASA Task Load Index (NASA-TLX), General Health Questionnaire (GHQ), and Health and Safety Executive (HSE)-UK job stress checklists were used to collect data. Data analysis was performed using the SPSS software, employing descriptive statistics, independent t-tests, and one-way analysis of variance (ANOVA).
Results: According to the posture assessment with the ROSA method, the average final ROSA score was 4.33±1.03. Examination of mental load with the NASA-TLX indicated that 78% had a high mental load. In addition, according to the GHQ questionnaire, the average final general health score was 24.4±11.73. Moreover, based on the HSE-UK occupational stress questionnaire, more than 80% (103 people) of employees were under severe stress, and 12% (15 people) were under critical stress. A significant relationship was observed between occupational stress, body mass index (BMI), and age (P<0.05).
Conclusion: The implementation of intervention and control measures to improve musculoskeletal disorders, workload, general health, and job stress seems to be essential.
Fatemeh Rezaie Pourmashizi, Behrouz Hajilou, Rashid Heidarimoghadam, Sara Anbarian, Mehrdad Anbarian,
Volume 13, Issue 1 (Iranian Journal of Ergonomics-In Press 2025)
Abstract
Background and Objectives: Core muscles of individuals with low back pain show a different pattern of activity compared to the healthy group during load lifting. This issue may be due to changes in spinal control mechanisms such as muscle synergies. The aim of this study was to compare the synergy pattern of selected core muscles and lower limbs muscles during load lifting and lowering with two different techniqus among females with non-specific back pain in comparison with healthy group.
Methods: Eighteen healthy females with non-specific back apin and 18 match controls participated in this study. The activity of 8 muscles of the core and lower limbs was recorded while lifting a load of 10% of the subject's mass with stoop and squat techniques. Then, using non-negative matrix factorization algorithm, the pattern of muscle synergies was extracted. Pearson's correlation method and independed t-test was used to compare synergy patterns (p<0.05).
Results: Patients with back pain had a different muscle synergy pattern compared to the healthy group in both stoop and squat techniques. The peak muscle synergy patterns of patients in both techniques were different from healthy subjects and were created in a different time cycle of lifting the load.
Conclusion: The results of this study showed that individuals with non-specific back pain use different synergy patterns during load lifting, and the body's control system may respons differently in patients with non-specific low back pain compared to healthy individuals. It is possible that the changes observed in the relative weight of muscles in patients and healthy people are caused by the changes in muscle synergy patterns, which requires further studies.
