Ergonomic Risk Factors Research Articles

Musculoskeletal Disorders and Related Risk Factors in Iranian Military Personnel: A Systematic Review and Meta-Analysis

Background: Work-Related Musculoskeletal Disorders (WRMSDs) are prevalent and costly diseases in military occupations. WRMSDs are prevalent and costly diseases in military occupations. We investigated the exposure to ergonomic risk factors and the prevalence of musculoskeletal disorders (MSDs) among military personnel in the workplace. Method: We aimed to investigate MSDs by conducting electronic searches on Persian databases such as SID, MagIran, and IranMedex, and English databases like PubMed, Web of Sciences, and Scopus. The search was not restricted by time and was conducted until Dec 20, 2021. Two researchers independently extracted the data, and the quality of the research was evaluated using the STROBE checklist. The results of different studies were merged and incorporated into the analysis using Comprehensive Meta-Analysis (CMA) v3 software. Results: Eleven qualitative studies found that 92% of the respondents were men (83% to 96%). The mean age was 34.17 ± 0.16 yr, with a confidence interval (of 95% CI:33.85-34.48). The mean BMI was 25±0.39 with a confidence interval of 95% CI:24.28-25.84. The mean work record was 12.89±0.81 yr with a confidence interval of 95% CI:11.30-11.48. The highest outbreak of MSDs is in the knee at 38.1% (95%CI:32.1-44.4), 37.6% of the neck (95% CI:24.8-52.5), and 32.5% of the shoulder. (95%CI:22.5-44.3) was observed. Conclusion: The wide role of various dimensions of work tasks and repetitive tasks (such as lifting, moving or changing positions, standing for long periods, as well as improper postures) in causing WRMSDs. Additionally, the risk factor in the workplace has financial implications for the military organization. The reduction of physical and psychological demands, as well as the improvement of ergonomic standards in the workplace, should be addressed to decrease MSDs in military centers.

Evaluation of tomato farmworker upper limb ergonomic risk factors

Research on musculoskeletal disorders among tomato farmworkers is limited. This pilot study aims to generate insights and preliminary data on tasks performed by tomato farmworkers at a demonstration test plot, evaluating associated ergonomic risk factors. A demonstration test plot was constructed to simulate tasks performed by tomato farmworkers. Muscle activity in the anterior deltoid and upper trapezius was measured using surface electromyography (sEMG) and compared among tasks. The intensity of physical activity during stake pounding, bucket tossing, and tying tasks was monitored using a GT9X activity monitor. Non-parametric ANOVA revealed that the upper trapezius exhibited the highest muscle activity in all tasks (p < 0.05). Stake pounding showed the highest muscle activity, peak loads, and the most intense physical activity. Future studies will focus on assessing tomato farmworker activities over longer shifts and evaluating the impact of posture, fatigue, and energy expenditure on the risk for musculoskeletal disorders.

Ergonomic Risk Assessment for Manual Handling Activities in Automotive Workshop

Ergonomic risk assessment tools are tools that have been designed to solve the problem of ergonomics in the workplace from manual material handling activities. The objective of this study is to investigate Musculoskeletal Discomfort among workers related to manual handling activities using Cornell Musculoskeletal Discomfort Questionnaires (CMDQ); to assess an ergonomics risk factor among workers related to manual handling activities using Manual Handling Assessment Chart (MAC), NIOSH Lifting Equation(NLE), and Key Indicator Method for Manual Handling Operation (KIM-MHO) method and; to compare the results between CMDQ and assessment tools. This case study was conducted in Parit Raja, Johor, Malaysia involving 34 male mechanics workers. The tools used are as stated in the objective with the help of measurement tools such as a goniometer. The result of the CMDQ reveals that the body part with the highest discomfort level among the workers in the lower back, shoulder right and shoulder left with the percentage from the total discomfort score of 20.91%, 13.57%, and 13.36% respectively. From the result of the assessments, it is concluded that the highest risk factor contributing to the MSDs is the bad posture of the worker during the manual handling operation followed by the frequency of lifting and the weight of the load. By comparing assessment tools, the first comparison is made between the CMDQ versus KIM-MHO, MAC Tools and NLE. In this comparison that, it is highlighted the result type from CMDQ are different from the KIM-MHO, MAC Tools and NLE as its questionnaire result shows us the discomforts levels on the body of workers and the body parts affected on their body for the last seven days but the assessment tools results show us the risk factor that contributes to the MSDs. For the comparison between the three assessment tools, it can be said that the tools that have the highest correlation with CMDQ are MAC Tools. In conclusion, most workers suffer from MSDs in their lower back due to their bad posture during manual handling. KIM-MHO is the best assessment tool among the three as it has the highest significance value while being the easiest tool to be used.

Ergonomics Risk Assessment of Musculoskeletal Disorder During Ultrasound-Guided Internal Jugular Venous Cannulation.

Acutely sick patients can receive emergency intravenous access through central venous cannulation to administer fluids and medicines, perform haemodynamic monitoring and extracorporeal therapies, including plasmapheresis or haemodialysis. Using the Seldinger procedure, access is gained by percutaneous puncture, frequently guided by ultrasonography into the femoral, subclavian or internal jugular veins. This study aimed to identify ergonomic risk factors for musculoskeletal disorders (MSDs) in operators performing ultrasonography-guided internal jugular vein (IJV) cannulation at various table heights and probe orientations. Sixty emergency medicine residents participated in a cross-sectional study conducted by the Emergency and Trauma Department of Hospital Universiti Sains Malaysia, Kelantan. Participants were instructed to perform the cannulation at two distinct table heights and with two distinct probe orientations. To compute the ergonomic risk score, the Rapid Entire Body Assessment (REBA) method was used. The table height of 0.5 elbow factor with varied probe resulted in a median REBA score of 5.0, whereas the table height of 0.7 elbow factor with varied probe had a median REBA score of 4.0. All four positions exhibited medium risk for MSDs. This study showed that the table height of 0.7 elbow factor is more ergonomically favourable while still imposed medium risk for MSDs.

Assessment of occupational musculoskeletal disorders (MSDs) among heavy vehicle drivers.

Professional driving requires long hours of work, uncomfortable seats, negotiating rough terrain and highways, and possibly minor repairs and other auxiliary transportation duties. Heavy vehicle drivers driving vehicles such as trucks, bulldozers, etc. due to such working structures are more prone to various musculoskeletal disorders (MSDs) and pain, which is of great concern. In the present study, it is planned to investigate possible ergonomic risk factors such as age, weight, driving exposure, seat suspension systems, lifting heavy weights causing MSDs in drivers of various heavy vehicles. The results of the study are expected to help drivers reduce the risk of MSDs. For the present study, the Nordic questionnaire on musculoskeletal disorders was modified and standardized and was administered to the 48 heavy vehicle drivers randomly selected to collect the data. The analysis divulged that over the past 12 months, lower back pain (LBP) emerged as the most dominant pain experienced by 56% of drivers, followed by knee pain (KP) (43%) and neck pain (NP) (39%) respectively. The prevalence of shoulder pain (SP) was observed to be much lower than in previous literature. The logistic regression model further revealed that increasing age, poor suspension system and poor body posture were significantly associated with lower back pain. Additionally, a poor suspension system and lifting heavy weights had significant effect on the drivers' knee pain. The results demonstrated the evident necessity for ergonomic consideration in vehicle designing and ergonomic training for heavy vehicle drivers.

De Quervain's tenosynovitis as an occupational disease in agricultural worker: A case report.

De Quervain's tenosynovitis is upper-limb disorder, more frequent in women. It is rarely recognized as an occupational disease. In this paper we reported work related de Quervain's tenosynovitis in cow milker. Ergonomic risk factors were assessed by utilizing assessment of repetitive tasks (ART) of the upper limbs method. Physical examination and imaging exams were used. We presented a 36-year-old female agricultural worker (workplace cow milker) exposed to work factors (forceful hand/wrist exertions, repetition, extreme postures) for 14 years. She was suffering the pain in the right hand, mainly near the thumb for few years. She was treated conservatively and surgically, however disability was permanent. Clinical examination showed slight edema of the right hand, increased palm's sweating. Patient had reduced range of movements and grip strength. Report shows that work-related factors were strongly associated with diagnosed de Quervain's tenosynovitis. Hand function plays an essential role in carrying out activities of daily living and this disorder pose a relevant burden of disease. Exposure to biomechanical factors should be an important initial target for the prevention of De Quervain's tenosynovitis in the working population.

Musculoskeletal Health Problems Among the Loom Weavers of Sirajganj District, Bangladesh

Loom industry in Bangladesh is the foremost imperative &amp; antiquated house industry with a decentralized setup. The industry is giving vocation for millions of individuals within the nation. The target populace includes weavers over northern Bangladesh. The ponder secured a sizable number of population i.e, 208 subjects in Enayetpur and Madhabpur village, Sirajganj. To ensure representativeness, a non-probability convenience technique was utilized to choose a test estimate of 208 members. To be qualified for the study, members were chosen who had minimum two years of experience. Male were predominant (96.2%) among the respondents. Monthly income showed that major part (48.1%) of the respondents fell in 10-15thousand BDT category. Majority (63.5%) of waste disposal strategy taken after by the wok-places was landfilled. What's really interesting is that many respondents reported having musculoskeletal problems; lower back pain (59.6%) was the most frequently reported one. These health issues were connected to weaving activities because they involve lots of repetitive movements with hands, shoulders, legs, and other parts. Most health concerns in this field came from ergonomic risk factors. Future research should aim to include diverse populations and explore interventions that can mitigate these ergonomic risks, ultimately improving the well-being of this vital workforce in Bangladesh's loom industry. Keywords: Bangladesh, Sirajganj, musculoskeletal, health, loom, weavers

Ergonomic Risk Factors and Musculoskeletal System Problems In Healthcare Professionals Working In Central Sterilization Unit

This study was conducted to determine ergonomic risk factors and musculoskeletal system problems in healthcare professionals working in the central sterilization unit. The study is of descriptive cross-sectional type. The sample of the study consisted of 87 health professionals working in the central sterilization unit of seven hospitals of a private health group in Istanbul. Data were collected by face-to-face interview method using the sociodemographic characteristics form, the validated and reliable Ergonomic Risk Factors and Musculoskeletal Disorders Scale (ERKISO) and the Cornell Musculoskeletal Disorder Scale (T-CMDQ) between February and September 2020. Factor analysis, descriptive statistics, Mann Whitney U test, Kruskal-Wallis H test, post-Hoc analysis test and correlation test were used in the evaluation of the data. The level of significance was accepted as p

Prevalence of Lower Back Pain and Associated Workplace and Ergonomic Factors among Mineworkers in a Nickel Mine, Zimbabwe

Lower back pain is a common occurrence among mine workers due to the nature of their work. Globally, workplace (occupational) and ergonomic risk factors have been reported to influence the prevalence of lower back pain among workers. This study aimed to determine ergonomic risk factors associated with lower back pain and associated risk factors (workplace and ergonomics) among mineworkers in a nickel mine in Zimbabwe. A cross-sectional study design was employed, and participants were randomly selected to complete a questionnaire that included the Dutch Musculoskeletal Questionnaire (DMQ). A total of 420 mine workers were interviewed, with the majority being male (n = 259, 61.7%) and aged between 31 and 44 years old (n = 159, 37.9%). The study found that the prevalence of lower back pain was 41.43% (n = 174). Several risk factors were found to be associated with lower back pain, including working overtime (AOR = 1.13, p &lt; 0.01; 95% CI: 0.07–0.22), performing repetitive tasks (AOR = 8.06, p &lt; 0.01; 95% CI: 4.67–13.93), bending (AOR = 7.77, p &lt; 0.01; 95% CI: 3.97–15.22), and twisting (AOR = 3.32, p &lt; 0.01; 95% CI: 1.83–6.03). Based on these findings, it is recommended that an ergonomic risk assessment and prevention program be implemented, which should include educational awareness about lower back pain and its prevention among mine workers.

Musculoskeletal Disorders at Work among Slovenian Physiotherapists: Prevalence and Risk Factors

BACKGROUND: Musculoskeletal disorders at work (MSDWs) remain the most common health problem in the European Union, particularly in Slovenia, where the prevalence of MSDWs is slightly above the European average. Despite the extensive literature on MSDWs in the health sector, there is little research on physiotherapists (PTs), especially in Europe. Our previous study showed a high prevalence of MSDWs among PTs, with the lower back, neck, and shoulder being the most affected. AIM: The aim of this study was to investigate the prevalence of MSDWs among Slovenian PTs, ergonomic factors, and the association between MSDWs and demographics and MSDWs and ergonomic risk factors. METHODS: The survey covered Slovenian PTs working in different health-care settings, using a non-randomized snowball sample. 198 PTs participated, after excluding 22 incomplete questionnaires, 176 PTs remained in the final sample. Data were collected through questionnaires covering demographics, ergonomic risk factors, and the incidence of pain and discomfort in the body. RESULTS: The lifetime prevalence of MSDWs among 176 FTs was 97.7%. The most affected body regions were the neck (79.5%), upper back (59.2%) and lower back (51.7%). The 1-year prevalence of MSDWs was 94.9%, with the highest prevalence in the upper back (69.3%), neck (66.5%) and lower back (64.3%). The study identified a weak negative association between the prevalence of MSDWs and factors such as age, working life, and job satisfaction across various body regions. CONCLUSIONS: The results of the survey confirm a high prevalence of MSDWs among Slovenian PTs, which is comparable to European surveys. Key risk factors include ergonomic load and demographic variables. These data highlight the need to improve working conditions and ergonomic measures in physiotherapy practice. The study contributes to a better understanding of MSDWs among PTs in Slovenia and provides a basis for further research and interventions to reduce the risk of MSDWs.

A Mobile based Decision Support System for Postural Evaluation of Agricultural Activities with Rapid Entire Body Assessment (REBA)

Agriculture is an unorganized sector and it is a very high drudgery prone profession due to the absence of awareness and entry of advanced agricultural technologies. Many farming activities and operations are carried out by farm workers in the agriculture sector, where they are subject to very poor working conditions which can lead to physical and mental stress. Workers in agriculture experience musculoskeletal disorders in various body parts throughout various agricultural operations. These problems are caused by heavy work loads, repetitive movements, uncomfortable postures, prolonged periods of time spent in neutral or unsupported positions and the use of conventional equipment and implements that are not ergonomically built. The ergonomic risk factors present in the workplace can be examined using various evaluation instruments to ascertain the workers abilities and drawbacks. The work-related risks are measured using the scientifically validated posture assessment instruments. Rapid entire body assessment (REBA) is a technique that assess a person’s complete body including wrists, fore arms, elbows, shoulders, neck, trunk, back, legs and knees. It uses a systematic process to find the postural musculoskeletal disorders and risks associated with the job tasks. A mobile application is developed to assess the agricultural activities on the basis of physiological analysis and postural analysis using REBA ergonomics technique. The application evaluates the drudgery involved in the agricultural work by using physical assessment followed by postural ergonomics methods and provide recommendation of correct posture to avoid developing musculoskeletal disorders.

Understanding Musculoskeletal Risks in Retail Workers: An Ergonomic Assessment of Store 24H

Musculoskeletal disorders (MSDs) are prevalent in retail environments, often resulting from repetitive tasks, awkward postures, and prolonged standing. This study examined musculoskeletal discomfort and ergonomic risk factors within the retail environment of convenience stores, focusing on the prevalence of MSDs among employees of Store 24H, Dungun, Terengganu, Malaysia. The assessment began with a job task description, followed by workplace observation and worker input. Utilising a systematic approach, the research integrated two standardized assessment tools; the Cornell Musculoskeletal Questionnaire (CMQ) and the Initial Ergonomic Risk Assessment (ERA) Form Checklist, to identify the discomfort area and ergonomic risk factors associated with job tasks. Three job tasks were identified in the Store 24H environment; operating cash registers, customer service and restocking. The findings indicate a notable prevalence of MSDs associated with the identified high-risk tasks. Repetitive motions, awkward postures, prolonged standing, and forceful exertion were observed as primary ergonomic risk factors for these tasks which contribute to musculoskeletal discomfort in the neck, shoulder, back, hip, and knee. Additionally, forceful exertion and vibration exhibit high risks towards restocking tasks, resulting in restocking as the top contributor towards the MSDs. Hence, the findings highlight the need for advanced ERA and mitigation strategies, including workstation redesign, task rotation, ergonomic training and accessories, to promote employee well-being and reduce the incidence of MSDs among employees of Store 24H. Implementing these measures is essential for promoting the health and well-being of employees, decreasing the occurrence of musculoskeletal disorders, and improving overall safety and productivity in the workplace.

Ergonomic Considerations for Practicing Massage Therapists.

The physical demands and repetitive movements performed by massage therapists during a treatment increase the risk for work-related musculoskeletal disorders. While massage therapy meets the level of heavy physical demand, the ergonomic risk of performing a massage was previously unknown. The Massage Therapy Foundation undertook a job task analysis to be used by educators, employers, and clinicians to create an optimal work environment. Data collected via survey were used to create the protocol for an onsite data collection where massage therapists were evaluated on the ergonomic risk factors by trained ergonomists. The results of the job task analysis found the highest variability in movement when the massage therapist was treating the neck prone, neck supine, and leg prone. When the massage therapists did not change positions during a stroke, there was increased forward flexion of the trunk which increased postural stress on the extensors of the back and neck. Strokes such as effleurage which can span the entire length of the body part had the highest cumulative load, requiring postures that put mild biomechanical stress on the shoulders (90% of the time), neck (70% of the time), and trunk (60% of the time). The forward-bending posture of the massage therapist increases the eccentric demands of the therapist's neck and back musculature, thereby increasing fatigue and leading to an increase in the chance of overuse injury. The job task analysis recommends the massage therapist monitor the duration of application in an unsupported position, take more time between sessions, work in an optimum environment, including correct table height, and have a healthy, active lifestyle to maintain career longevity.

Preventing Surgeon Work-Related Musculoskeletal Disorders: A Pilot Study of the Comprehensive Operating Room Ergonomics (CORE) Program.

Work-related musculoskeletal disorders (WMSDs) among surgeons are markedly increasing. Several proposed interventions to reduce WMSDs among surgeons have been studied, but few follow an occupational therapy-oriented approach addressing biomechanical, psychophysical, and psychosocial risk factors. To design, implement, and assess the potential of the Comprehensive Operating Room Ergonomics (CORE) program for surgeons, a holistic evidence-based ergonomics and wellness intervention grounded in occupational therapy principles. Mixed-methods pilot study with the quantitative strand embedded in the qualitative strand. University-affiliated hospital. Six laparoscopic surgeons. CORE program outcomes were assessed using qualitative and quantitative data to indicate changes in posture, physical discomfort, sense of wellness, and operating room (OR) ergonomic performance. The Rapid Upper Limb Assessment (RULA) was used to quantify surgeons' WMSD risk level before and after intervention. There were 12 baseline observations (two for each participant), and two or three post-CORE implementation observations. A statistically significant difference, F(1, 6) = 8.57, p = .03, was found between pre- and post-occupational therapy intervention RULA scores. Thematic analysis of surgeon feedback, which was overwhelmingly positive, identified five themes: postural alignment, areas of commonly reported physical pain or discomfort, setup of the OR environment, surgical ergonomics training, and ergonomics in everyday life. The CORE program effectively decreased ergonomic risk factors to optimize surgeons' occupational performance in the OR. This study demonstrates a potential solution to how occupational therapists can holistically support surgeons and health care providers who are at risk for WMSDs. Plain-Language Summary: By 2025, a surgeon shortage is expected, partly because of the increase in surgeons' work-related musculoskeletal disorders, which affect their health and job continuity. This pilot study shows that the Comprehensive Operating Room Ergonomics program effectively addresses these problems. The study also serves as a framework for occupational therapy professionals to work with health care providers on ergonomics, benefiting population health. Results suggest that this approach could enhance surgeons' work conditions, supporting the American Occupational Therapy Association's Vision 2025 to improve health and quality of life.

Ergonomic Risk Assessment and Mitigation Strategies for Retail Workers: Insights from a Case Study in Dungun

Manual handling activities contribute to 40% of musculoskeletal disorders (MSDs), leading to long-term discomfort, disability, medical costs, and financial hardships for workers, while employers face lower productivity and compensation costs. An ergonomic assessment was conducted among employees at ABC Hardware in Dungun to identify ergonomic risk factors, determine the likelihood of harm affecting workers' musculoskeletal health, and recommend control measures to improve workers' health and well-being. Utilizing a combination of interviews, observations, and questionnaires based on established ergonomics guidelines, the research highlights the prevalence of MSDs among workers engaged in manual handling tasks, emphasizing the need for ergonomic interventions and awareness to enhance workplace safety and employee well-being. Findings from the ergonomic assessment revealed significant discomfort and risk factors related to awkward postures, repetitive motions, forceful exertion, and static positions. Specific ergonomic issues identified include discomfort in the upper back, thighs, and knees among storekeepers, and neck and lower back pain among warehouse workers. Service desk representatives were found to experience discomfort related to static postures and repetitive motions. The study recommends advanced ergonomic assessments such as Rapid Entire Body Assessment (REBA), Occupational Repetitive Assessment (OCRA), and Rapid Upper Limb Assessment (RULA), along with improvements in ergonomic practices and tools. Implementing job rotation, providing ergonomic equipment, and conducting training on proper lifting techniques are essential to address the identified risks. This research highlights the critical role of ergonomic practices in preventing MSDs and improving overall workplace safety.

A Product Evaluation of Augmented Reality Equipment Coupled to Diagnostic Medical Sonography: A Potential Equipment and Ergonomic Innovation

Objective: The aim of this product evaluation was to investigate the workflow and occupational health benefits of implementing augmented reality (AR) technology (MediView XR Inc, Cleveland, OH) paired with a portable ultrasound equipment system. Materials and Method: A diverse sample of sonography users was consented and ranged in experience levels. They were asked to complete a video training session, a hands-on demonstration, and remote instruction while using the augmented reality ultrasound (AR US) system. The duration of participants’ tasks was assessed during the use of both AR US and the 2-dimensional ultrasound (2D US) system. Participants’ postures and positions were evaluated using the Rapid Upper Limb Assessment (RULA), which assessed ergonomic risk factors, linked to body position and muscle usage. Participants also completed the System Usability Scale (SUS). Finally, participants were invited to complete a qualitative interview session, regarding the use of the AR US system. Results: A total of 20 participants provided data after using both the AR US and 2D US systems. The assessment data revealed positive SUS scores, which reflected favorably on both the product, education, and the training provided. The time spent on simulated work (20 minutes), with both imaging systems, remained consistent. The Rapid Upper Limb Assessment tool (RULA) scores for the cohort indicated a lower (better) median upper body score when using the AR US system. The cohort also had a statistically significant lower median subscore for the neck, trunk, and legs, compared with 2D US ( p &lt; 0.00). Conclusion: Although larger studies are necessary to validate these findings, this cohort identified several opportunities for integrating the AR US system. Preliminary evidence suggests that an AR US system may offer occupational health benefits, as part of the imaging workflow.

Investigating basics and principles of ergonomics in the sheet

The development of work-related musculoskeletal disorders depends on the pattern of work and does not belong to a particular industry or occupation. One way to assess the amount of stress and tension on the body is to evaluate posture. The aim of this study was to determine the risk factors for musculoskeletal disorders in cellulose industry workers. Study, 22 stations were examined using RULA method, of which 7 stations were at level 2, 14 stations were at level 3 and one station was at level 4. 14 stations were surveyed using REBA method, among which, 2 stations were at level 1 and 12 stations were at level 2. Also, 38 stations were surveyed using the KIM-LHC method, of which 26 stations were at level 2 and 12 stations were at level 3. Statistical studies showed that there was a significant relationship between low back pain and work experience at the level of 0.01. The prevalence of shoulder, arm, back and leg pain was significantly different between men and women at the level of 0.01. There was also a significant relationship between the prevalence of musculoskeletal disorders in the lumbar and shoulder area over a period of time and the level of risk of work postures. The results of the study showed that the prevalence of musculoskeletal disorders and risk levels calculated by RULA and KIM methods were high in the subjects, but the risk level calculated by REBA method was low and moderate. Therefore, any program to prevent the occurrence of these disorders in the workplace and control the relevant ergonomic risk factors and take corrective measures to improve working conditions at all stages of production, is necessary.

APPLICATION OF THE QEC (QUICK EXPOSURE CHECK) ON THE ERGONOMIC RISKS ASSESSMENT IN THE INDUSTRIAL FIELD

One of ergonomic problems that often occur in the work place, relating to human strength and endurance while doing the job (biomechanics), is musculoskeletal or muscular strain. For the present study 5 respondents who were factory workers were selected and QEC scale was used for the assessment of the ergonomic risk factors of the respondents. These problems were often occurred by workers who did repetitive movements continuously. The observation of the activities performed by a worker, in order to identify the ergonomic risk factors, lasts between 30 and 60 minutes, this also depending on the complexity of the activity, the anthropometric data of the workers and their experience in performing these activities correctly. Therefore, the application of QEC methodology is not complicated at all, but it requires increased attention, good organization and a good understanding of ergonomic risk factors.

Determining the effect of environmental factors, work postures and mental workload on musculoskeletal disorders in rescue workers and accidents of one of the water and sewage companies in Iran.

Musculoskeletal disorders are one of the most important problems faced by ergonomists today. This study was conducted with the aim of investigating the effect of weather conditions, working conditions and mental workload on musculoskeletal disorders of rescuers and water and sewage company accidents in hot and cold seasons. The present study was a longitudinal study that was performed on all employees of rescue and disaster teams of Shiraz Water and Sewerage Company in Iran (184 people) by census. Demographic and Nordic questionnaires, NASA Load Index (NASA-TLX), work environment assessment with temperature screening checklist and workplace ergonomic risk factor (WERA) assessment method were performed by the researcher. The collected data were analyzed using SPSS version 23 software and parametric and non-parametric statistical tests. The results showed that the highest and lowest prevalence of musculoskeletal disorders related to knee and back in winter and thigh in summer with prevalence of 57.1, 55.4 and 6%. The comparison of exposure to heat stress factors in summer and winter seasons showed that the temperature factors and work clothes of the workers in both seasons are in worse conditions than other factors (P < 0968). The results of the mental workload of people in two seasons showed that the highest and lowest mental workload is related to physical changes in the winter season and frustration in the summer season, and this relationship was significant (P < 0.001). Using multiple logistic regression model, the potential risk factors for musculoskeletal injuries including age, height, BMI, level of education and work experience in both hot and cold seasons were compared. The results showed that in summer, work experience (OR = 1.16 (1.06-1.28.)) and height (OR = 1.03(0.98-1.08) had a direct effect on the prevalence of pain and discomfort arranged in the back areas. One year of increase in work experience significantly increases the chance of a disorder in the back by 16% and a one centimeter increase in height increases the chance of a disorder in the lumbar region by 3%, although this relationship is significant. It is recommended that suitable solutions such as using appropriate and up-to-date mechanical tools, reducing activity time, increasing rest time, increasing the number of personnel in order to reduce mental workload, using work clothes suitable for the season and type of work, and ergonomics training for workers are on the agenda of company officials. Water and sewage should be placed.

Relationship between Improper Working Posture among Maintenance Workers using Different Assessment Methods

The purpose of ergonomics is to take advantage of human ability limits in order to implement an efficient and comfortable interface to use. When the worker is performing an improper posture, it may cause the worker to feel discomfort when doing the work and may lead to getting musculoskeletal disorders (MSDs). According to past research, there is a relationship between improper working posture and MSDs. The objective of this study was to determine the relationship between improper working posture at maintenance workers using different assessment methods. CMDQ, RULA, REBA and ENBORA were conducted among 34 maintenance workers around Parit Raja, Johor. The selected maintenance workers were interviewed via CMDQ and RULA, REBA and ENBORA were conducted based on their working posture at the time of the interview. The data were analysed and compared based on similar observed body parts. Among the respondents, lower back discomfort was most prevalent (70.59%), followed by right and left shoulders (58.82% and 55.88%, respectively) as well as right wrist (29.47%) and left wrist (55.88%). The mean RULA Score for the respondents was 4.76 (SD=1.37), which indicates a medium risk level. The mean REBA Score for the respondents was 7.41 (SD=2.26), which indicates the average REBA risk level was high. The mean value for the ENBORA Final Score was 33.56 (SD=11.98), indicating that the respondents overall have a negligible risk of getting MSD based on their working posture. The body parts compared in CMDQ, RULA, REBA and ENBORA were neck, upper arm, lower arm, wrist and trunk. Based on findings, ENBORA has the highest Pearson Correlation to CMDQ followed by RULA and REBA. In conclusion, the maintenance workers were found to be exposed to ergonomic risk factors (ERFs) and ergonomics improvement were needed in future.