Awkward Postures Research Articles

Ergonomic Analysis of Working Postures at a Construction Site Using Rula and Reba Method

Musculoskeletal Disorders (MSDs) are the main work-related problems in construction sites around the world. Awkward working posture is mainly responsible for occupational musculoskeletal injuries. The main objectives of the research were to analyse the working postures of construction workers and assess the level of risk of injury in their work. Four categories of working postures were collected from elementary works as a form of still pictures from the construction site. Two assessment tools RULA (Rapid Upper Limb Assessment) & REBA (Rapid Entire Body Assessment) were used to assess the working postures of construction workers. Results showed that Beam and column casting and masonry workers were at high risk of injury due to the absence of maintaining proper working postures during the work. This study suggested to construction workers to maintain proper postures during works for avoiding any occupational injuries. Journal of Engineering Science 14(1), 2023, 43-52

Risk Factors for the Musculoskeletal Pain Based on the Computer Ergonomics Related Practices among Medical Professionals

Background: With The fast growing world, in Bangladesh also getting increased usage of digital connectivity has led to a rise in online activities and also rise in the musculoskeletal (MSK) pain among the professionals.Objective: We investigating the relationship between MSK pain and discomfort among resident doctors because of computer ergonomics related issues.Materials and Methods: The study collected computer ergonomics related information from 227 resident doctors who had used computer for at least one year. Along with descriptive statistical tools, this study addressed essential test of hypothesis and administered a binary logistic regression model to identify the risk factors of MSK pain among resident doctors.Results: The prevalence of neck pain and lower back pain was estimated over 50% whereas more than one-third faced pain in one or both eyes as well as in their upper back. The different sorts of ergonomics significantly associated with different types of MSK pain. The faculty type- taking break, awkward posture, the shoulder placement had significant impact on the pain in one or both eyes. Besides, having gap between leg and seat as well as monitor placement were the significant predictor of neck pain. In addition, wrist not straightening was not the only risk factor for lower back pain and faculty type, device type, gap between legs and seat, Not having an armrest were the risk factors for upper back pain.Conclusion: The computer ergonomics related practices are the fundamental codes for the medical professionals to avoid MSK pain and hence specific practice safeguards for specific pains.
 KYAMC Journal Vol. 14, No. 01, April 2023: 19-24

The impact of fatigue on shipyard welding workers’ occupational health and safety and performance

Welding processes are critical for shipbuilding operations in shipyards. Welders’ performance is critical for the quality and speed of the welding; on the other hand, welding requires awkward and repetitive body postures for long durations, which has a negative impact on the Occupational Health and Safety (OHS) of the welding workers. This study, therefore, investigates the long-term impact of welding workload on the body for different age groups and experience levels, as well as the long-term impact on chronic fatigue and inter-shift recovery. In order to determine the impact, this study conducted a comprehensive data collection campaign in the shipyard through observation and questionnaires. Results indicate that the eyes, knee, neck and waist are the most discomforted body parts for investigated welding positions. The age of welders was an important parameter of the most affected body part.Moreover, the short-term fatigue impact on welding performance was also investigated to identify the impact on productivity. The Discrete event simulation (Rockwell ARENA) demonstrated that efficiency loss from short-term daily fatigue is around 22,9% compared to the rested condition. The main contribution of this study was investigating fatigue impact on OHS and productivity for selected shipbuilding tasks. The findings of this study can be utilised for shipyard production capacity and resource planning and OHS improvements. The results can also be used further as a coefficient of performance in the production simulation analysis when studying shipyard efficiency. This is a valuable contribution to the literature on shipyard productivity.

Neck and upper extremity musculoskeletal problems in cosmetologists caused by work-related ergonomic risk factors in Denizli, Turkey.

Work-related musculoskeletal disorders (MSDs) of the neck and upper limbs are a common health problem among cosmetologists. Hairdressing requires bending, twisting, static postures, prolonged standing, repetitive motions, and vigorous movements of the hands and fingers. In order to determine the proper ergonomic measures, identifying the factors and hairdressing jobs that increase the risk of work-related neck and upper limb disorders is needed. The objective of this study was to determine the prevalence of MSDs in the neck and upper extremities of cosmetologists and to investigate the association with ergonomic risk factors and hairdressing work. The cross-sectional study was conducted on cosmetologists in Denizli, Turkey province (n = 504). Data collected through a survey included questions on sociodemographic characteristics, work organization, equipment, and hairdressing work, items on work posture, the Extended Nordic Musculoskeletal Questionnaire, and the Demand-Control-Support Questionnaire. Work posture in hairdressing was assessed using the Rapid Upper Limb Assessment (RULA). The prevalence of MSDs of the neck and upper limbs in the previous twelve months ranged from 7.7-55.8%. There was high, or very high, risk in 56.1% of work postures, and the median RULA score was 5.0 (4.0-6.0). The significant predictors of pain were work experience, gender, marital status, risk perception, awkward posture, psychological demand, and hair coloring. It is necessary to take control measures in hairdressing salons promptly to adopt more suitable working posture and to design workplaces ergonomically.

Ergonomic risk assessment during massage among physiotherapists: Introduction of generic postures notion.

Musculoskeletal disorders are prevalent among physiotherapists. They perform many repetitive tasks in awkward postures that require a high muscle load. This issue was often addressed through subjective analysis (questionnaire) but rarely using postural evaluation combined with an ergonomic assessment. The aim of this article was to decompose draining lymphatic massage performed by physiotherapists in generic postures (GP) to quickly assess the musculoskeletal disorder risk. Based on numeric video recorded in frontal and sagittal planes, 3360 postures were defined from 20-minutes lymphatic drainage massage performed by 7 physiotherapists over a period of 6 months. A hierarchical cluster analysis was applied to define the GP. Seven GP were identified, which were described by their average joint angles, variability and relative frequency. GP6, GP4 and GP2 had the highest frequencies (17.6%, 16.9% and 16.8% respectively). Trunk and neck were essentially flexed (neck: 17.0±10.0° for GP1; trunk: 20.4±8.7° for GP4). Shoulder flexion and abduction ranged from 15° (GP7) to 60° (GP4). Mean and variability of RULA score completed the analysis. The highest scores were computed for GP2 and GP3 (respectively 5.5±1.3 and 5.8±1.2, p < 0.05). GP4 had the lowest (4.0±1.1, p < 0.05). The results suggest that massages have to be monitored. Attention should be paid to the postures used to prevent the occurrence of MSDs. The massages could be described as a combination of generic posture for a rapid ergonomic assessment.

Prevalence and risk factors of work-related musculoskeletal disorders among cashiers in small-scale businesses: a cross-sectional study in Ethiopia

ObjectiveThis study aimed to investigate the prevalence and factors associated with work-related musculoskeletal disorders among cashiers in small-scale businesses in Northwestern Ethiopia.DesignA multicentre cross-sectional study was conducted from July to...

Factor Analysis of Low Back Pain among Women in Sea Food Processing.

Women in sea food processing units were involved in pre processing, grading, cleaning, freezing and packaging and they adopted static and awkward posture which results in low back pain. The aim of the present study is to analyze the factors that contribute to low back pain among women workers. A total of 244 women workers participated in the study. Socio economic background and frequency of musculoskeletal discomforts were studied. Descriptive statistics, chi square analysis and factor analysis were carried out to identify the factors contributing to low back pain. Women were involved in peeling (48.8%), setting (26.6%) and grading (24.6%) activity. Factor analysis indicated that work environment contributed to 33%, personal factors contributed to19%, work organization contributed to 16% and socio economic factors contributed to 11% for the low back pain. Worker education and periodical health surveillance will help to minimize the risk of low back pain among the women in industrial settings.

Risk Factors Associated with Musculoskeletal Disorders Among Professional Drivers in Asian Countries: A Systematic Review

Musculoskeletal disorders (MSDs) are injuries in the musculoskeletal system caused by sustained or sudden exposure to repetitive motion, vibration, force, and awkward positions. Professional drivers are one of the working populations with a high risk of developing MSDs. Several studies had examined the prevalence and risk factors (RFs) for MSDs among professional drivers. Thus, this systematic review aims to analyze the literature and report the risk factors associated with MSDs among professional drivers in Asian countries. Published literature was systematically searched through EBSCOhost, Web of Science, and OVID. Studies which met the inclusion criteria were methodologically appraised using the Appraisal Tool for Cross-Sectional Studies (AXIS). Based on the studies included, the RFs reported to be significantly associated with MSDs among professional drivers included physical RFs, individual RFs, and psychosocial RFs. There were some RFs that did not fall into the three categories. The most frequently and comprehensively investigated RFs were the physical RFs. In conclusion, there were various RFs associated with MSDs among professional drivers in Asian countries. Further studies should be conducted to understand MSDs among professional drivers in different contexts and circumstances. A holistic and multidisciplinary approach should be used to develop effective management and preventive techniques to address this common occupational problem affecting a large proportion of the working population.

Risk Factors for Cumulative Trauma Disorders (CTDs) Complaints

Background: The interaction of workers and work tools does not always have a good impact; the mismatch of worker anthropometry and work tools impacts work-related diseases. Jobs with repetitive motions, manual lifting, and awkward postures cause complaints of CTDs. These complaints impact decreased productivity and, in the long run, cause permanent disability. This study aims to determine the risk factors for CTDs complaints. Material and methods: Analytical observational research with a quantitative approach and a cross-sectional design. The population in this study is production workers at an Indonesian spinning and dyeing factory company. The sampling technique used is Total Sampling. The dependent variable is Complaints of CTDs, with the independent variables namely work posture, gender, age, BMI, and years of service. The research instruments used were questionnaires and REBA. Univariable analysis to determine the frequency distribution and bivariable analysis with the chi-square test. Result: Work posture is at risk of experiencing CTDs complaints as much as 90.9%, female sex as much as 71.2%, old age 87.9%, BMI not at risk 56.1%, years of service ≥4 years is 95.5%, and there are very high CTDs complaints 66.7%. There is a relationship between work posture (p value=0.001) and years of service (p value=0.003) with CTD complaints. There was no relationship between gender (p value=0.393), age (p value=0.960), and BMI 0.429) with complaints of CTDs. Conclusion: Most workers experience complaints of CTDs. The risk factors for CTDs revealed in this study are work posture and length of service.

Work related musculoskeletal symptoms; exposures and perception towards physiotherapeutic interventions at work setting in teachers and caregivers of special schools in Pune – a questionnaire based study

Background: Teachers and caregivers at special schools are at a risk of developing work related musculoskeletal disorders (WRMSDs) as they tend to work in awkward postures. It is important to identify musculoskeletal complaints and exposure levels to incorporate work site modifications to reduce risk of developing WRMSDs. Also understanding their perception towards physiotherapy might help in better implementation of worksite wellness programs. Methods: Participants were administered nordic musculoskeletal questionnaire (NMQ), quick exposure check (QEC) questionnaire and a self-designed questionnaire with five domains. Results: Out of the 66 participants, 36 were teachers and 30 were caregivers. Results of NMQ stated that, 20 participants reported to have pain. 50 participants had discomfort in the form of stiffness, fatigue. Assessment via QEC revealed, 39 participants were exposed at a lower level, followed by 22 and 5 who were exposed at moderate and higher level of the risk factors causing WRMSDs respectively. 26 participants were not engaged in regular physical activity. 26 participants had never been explained about safe and ideal ways to handle children with special needs in order to prevent WRMSDs. Conclusions: Musculoskeletal pain was predominantly in the lower back, shoulder/arms, and neck region. Almost 60% of participants were exposed at a lower level to the risk factors leading to WRMSDs. All of the participants stated that they would like to attend a training program by a physiotherapist regarding the same.

Ergonomic assessment for designing manual material handling tasks at a food warehouse in India: A case study

AbstractManual handling of heavy grain bags is a commonplace activity across agriculture produce supply chain. In the present research, a manual material handling involving lifting, lowering, and carrying grain bags along the paths of variable characteristics is critically analyzed to explore the risk associated with it. The humans engaged in this activity are found to be facing discomfort, suffering from pain and musculoskeletal disorders, and undergoing medication for the same. This study proposes and demonstrates a structured ergonomic evaluation methodology to not only assess the level of discomfort/pain but also evaluate risk factors such as load handled, method of handling, frequency of handling, awkward postures, path characteristics, and so on. It employs a systematic multimethod approach consisting of Nordic Musculoskeletal Questionnaire and Borg Rating of Perceived Exertion, Ovako Working posture Assessment System, NIOSH Lifting Equation, Rapid Entire Body Assessment, and Key Indicator Method. The study reveals that about 94% of the sample population suffered from moderate to severe discomfort in ankle, knee, and lower back. Eight basic activities responsible for risky postures are identified. Frequency of handling, weight being handled, back bending/twisting, poor coupling, and walking surface are observed as major contributors to musculoskeletal discomfort. Carrying on shoulder is found to be riskier than carrying on back; however, the risk is found to be significantly lowered by carrying on backpack. The present study identifies the need for task redesign, proper gripping arrangements, auxiliary devices for lifting/carrying, and improvement in the path characteristics.

Design and Implementation of Hybrid Exoskeleton for Oil Palm Harvester to Reduce Muscle Strain

When it comes to safety at the workplace, palm oil harvesters are highly exposed to body pain and muscular fatigue, which in the long term may lead to permanent spinal or shoulder damage that will undoubtedly result in different extreme societal difficulties. Meager investment in safety and long hours of manual work in awkward posture is the main challenge in ensuring safety in the palm oil field. This study aimed to develop a novel light hybrid exoskeleton exclusively built for palm oil harvesting to reduce muscular strain, maintain minimum cost, and ensure material availability in the local market. The iso-elasticity approach and DC linear motor were used for gravitational and muscular torque compensation and position control. Muscular EMG signal was taken and filtered to investigate the muscle strain reduction after implementing the developed hybrid exoskeleton. The result shows that the overall muscle strain was reduced by 16% using the passive exoskeleton and 23% using the hybrid exoskeleton compared to freehand. According to the results, it is evident that the developed exoskeleton can be implemented in palm oil harvesting, which will reduce the pain level of the workers at a significant rate.

Faktor yang Berhubungan dengan Keluhan Musculoskeletal Disorders pada Pekerja Batik Cap

Background: Musculoskeletal Disorders (MSDs) are soft tissue injuries caused by sudden or repetitive meovement, forces, vibrations, and awkward positions. Batik cap workers are at risk of developling musculoskeletal complaints because they work in a static position for a long time. The purpose of this study was determine the factors associated with the incidence of musculoskeletal complaints stamped batik workers. Method: This type of research is descriptive quantitative with a cross sectional approach using a total sampling method that is a number of 53 workers, the instruments used are measuring sheets observations and questionares. Data were analyzed using the chi-square test and fisher’s test. The research wa conducted in November-December 2022. Results: The conclution in this study is that the variables associated with musculoskeletal complaints were work posture (p=0.000), length of work (p=0.043), length of service (p=0.000), workload (p=0.019), age (p= 0.000). There was no relationship with the incidence of gender complaints (p=0.404), exercise habits (p=0.581), body mass index (p=0.898). Conclusion: The conclusion in this study is that there is a relationship between work posture, length of work, years of service, workload, age, and there is no relationship between gender, exercise habits, body mass index.

Potential hazards and risk identification of safety and health in iron fabrication area of building construction project

Background: Hazard is a threat to the safety and health of workers. Iron fabrication as an iron work area to cut, bend, and assemble irons which will be used for building construction structures is not an exception for hazards. Preliminary observation has shown a number of hazards which were interesting to be identified further. This study aims to identify hazards in an iron fabrication area. It might be used as a basis to evaluate risks and decide appropriate control determinants. Method: The type of this study was a descriptive survey with an observational approach. The method applied in the study was a Walkthrough Survey using hazard identification sheets as the instruments. Hazard identification was conducted based on UURI Nomor 1 Tahun 1970 (RI Law, 1970) and PPRI Nomor 50 Tahun 2012 (RI Government Regulation, 2012), i.e. by identifying hazards coming from humans, production materials, tools, machinery, work methods, and work environment. Results: Unsafe action; Corroded iron coated with silica; Use of pliers, bending machine, cutting machine, grinder; Repetitive movements of manual handling, awkward body postures; Vibration, noise, heat pressure, dust, fecal coliform, mosquitos, centipedes, and scattered iron cuttings were some of the identified hazards. Conclusion: Every hazard has its own risk whose extent has not been evaluated in this study. In addition, control determinants have not been elaborated. Therefore, further studies are required to evaluate the risks and decide the control determinants based on the hazards which have been identified in this study.

An estimation of the endoscopist's musculoskeletal injury risk for right and left lateral decubitus positions during colonoscopy: a field-based ergonomic study

BackgroundColonoscopy exposes endoscopists to awkward postures and prolonged forces, which increases their risk of musculoskeletal injury. Patient positioning has a significant impact on the ergonomics of colonoscopy. Recent trials have found the right lateral decubitus position is associated with quicker insertion, higher adenoma detection rates, and greater patient comfort compared to the left lateral decubitus position. However, this patient position is perceived as more strenuous by endoscopists.MethodsNineteen endoscopists were observed performing colonoscopies during a series of four-hour endoscopy clinics. Durations of each patient position (right lateral decubitus, left lateral decubitus, prone, and supine) were recorded for all observed procedures (n = 64). Endoscopist injury risk was estimated by a trained researcher for the first and last colonoscopies of the shifts (n = 34) using Rapid Upper Limb Assessment (RULA), an observational ergonomic tool that estimates risk of musculoskeletal injury by scoring postures of the upper body and factors such as muscle use, force, and load. The total RULA scores were compared with a Wilcoxon Signed-Rank test for patient position (right and left lateral decubitus) and time (first and last procedures) with significance taken at p < 0.05. Endoscopist preferences were also surveyed.ResultsThe right lateral decubitus position was associated with significantly higher RULA scores than the left lateral decubitus position (median 5 vs. 3, p < 0.001). RULA scores were not significantly different between the first and last procedures of the shifts (median 5 vs. 5, p = 0.816). 89% of endoscopists preferred the left lateral decubitus position, primarily due to superior ergonomics and comfort.ConclusionRULA scores indicate an increased risk of musculoskeletal injury in both patient positions, with greater risk in the right lateral decubitus position.

Development of a real‐time work‐related postural risk assessment system of farm workers using a sensor‐based artificial intelligence approach

AbstractIn recent years, the promotion of farm mechanization has been directed toward reducing the human discomfort and fatigue associated with various agricultural work‐related activities. During these activities, many factors (like force, awkward posture, vibration, repetition, etc.) play a significant role in causing musculoskeletal disorders. Second, ergonomic risk assessment of physical work is conventionally conducted through observation and direct/indirect physiological measurements. However, these methods are time‐consuming and require human subjects to perform the motion to obtain detailed body movement data. In the present study, a semiautomatic rapid entire body assessment (REBA) evaluation tool is developed for real‐time assessment of agricultural work‐related musculoskeletal disorders risk of farm workers using Kinect V2 sensor‐based artificial intelligence approach. It allows the investigator speedy detect of awkward postures leading to critical conditions and to reduce subjective bias. It is useful to analyze online as well as offline posture analysis, it detects the critical areas of the body posture, which may lead to the musculoskeletal disorders of agricultural workers, and suggest aptly to correct the posture. The Kinect V2 REBA assessment score was found with a factual significant match with the reference expert evaluation as reflected by the Landis and Koch scale k = 0.673 (p &lt; 0.001), 95% confidence interval (CI) for the left side, and k = 0.644 (p &lt; 0.001), 95% CI for the right side of the body respectively.

Evaluation of concrete workers' interaction with a passive back-support exoskeleton

PurposeConcrete workers perform physically demanding work in awkward postures, exposing their backs to musculoskeletal disorders. Back-support exoskeletons are promising ergonomic interventions designed to reduce the risks of back disorders. However, the suitability of exoskeletons for enhancing performance of concrete workers has not been largely explored. This study aims to assess a passive back-support exoskeleton for concrete work in terms of the impact on the body, usability and benefits of the exoskeleton, and potential design modifications.Design/methodology/approachConcrete workers performed work with a passive back-support exoskeleton. Subjective and qualitative measures were employed to capture their perception of the exoskeleton, at the middle and end of the work, in terms of discomfort to their body parts, ease of use, comfort, performance and safety of the exoskeleton, and their experience using the exoskeleton. These were analyzed using descriptive statistics and thematic analysis.FindingsThe exoskeleton reduced stress on the lower back but caused discomfort to other body parts. Significant correlations were observed between perceived discomfort and usability measures. Design modifications are needed to improve the compatibility of the exoskeleton with the existing safety gears, reduce discomfort at chest and thigh, and improve ease of use of the exoskeleton.Research limitations/implicationsThe study was conducted with eight concrete workers who used the exoskeleton for four hours.Originality/valueThis study contributes to existing knowledge on human-wearable robot interaction and provides suggestions for adapting exoskeleton designs for construction work.

Gambaran Resiko Ergonomi Menggunakan Metode (NBM) pada Karyawan Kantor PT.PLN (Persero) Surabaya Selatan

In today's use of computers has a very diverse function in human activities, it is found that most office workers complete more than 75% of the duration of their work sitting in front of the computer. Computer users or office workers often experience health problems related to Musculoskeletal Disorder (MSDs) is a health problem that can reduce the function of muscles, tendons, nerves, blood vessels, bones, and ligaments caused by awkward posture, ergonomic risks that often occur in office workers. The research method used is an analytical method. February 2023. PT PLN (Persero) UP3 South Surabaya has six ULP, namely Rungkut ULP, Darmo Permai ULP, Dukuh Kupang ULP, Ngagel ULP, Gedangan ULP. There were 50% of respondents aged &gt;35 years, male gender 55%, working period &gt;10 years 64%, and 68% work duration for 6-8 working hours. The results of the NBM analysis provide information on changes in the distribution of musculoskeletaldisorders (MSDs) complaint rates of office workers are not sick (TS) = 4 5%, somewhat sick (AS) = 43.1%, sick (S) = 10.5%, very sick (SS) = 2.4%. The most dominant type of complaint for S complaint levels both before and after work is "pain in the waist and back". Scoring using the Nordic Body Map (NBM) questionnaire occurs in the upper neck, lower neck, back and waist. Control that can be done to minimize these complaints can be in the form of stretching every 2 hours for 10-15 minutes and regular exercise. In addition, you can also socialize the importance of office ergonomics in the office area using poster media.

Physiological responses, trunk posture, and work pace in commercial building cleaning in Washington State: An observational field study

Introduction: This study aimed to investigate whether work pace is a critical indicator for predicting a janitor’s risk of work-related musculoskeletal disorders (WMSDs). Method: Field measurements were obtained from commercial building janitors as well as the determination of work pace. Physiological responses collected were heart rate, energy expenditure (calories), activity level (METs), steps, trunk posture. Data were obtained using direct measurements, along with a time study, which was performed by shadowing 13 janitors in Washington State. The measured values were summarized descriptively, and five of the most common janitorial tasks were compared. The relationships between work pace and the physiological response variables were determined by calculating the Pearson product–moment correlation coefficients. Results: The highest average percent heart rate reserve (47.4%) was reported during restroom cleaning, while the highest activity and energy expenditure levels (3.6 METs and 217.1 calories/h) were reported for mopping. The top 90% of trunk flexion angles and the highest percentage of time in trunk flexion from 20° to 60° were recorded during restroom cleaning. Restroom cleaning showed the highest correlation between all the physiological response variables and work pace. In most of the tasks, a high work pace may have increased the degree and duration of severe trunk flexion. Conclusion: Overall, when several tasks were considered, the extent of physiological responses, trunk joint angles, and exposure time to awkward postures tended to increase with an increase in work pace. Practical Applications: This study showed the feasibility of using the work pace measured from time studies as a predictive indicator of WMSDs risks. Using this information, managers may compose a schedule that can minimize WMSDs risks while considering actual work pace deviations that may impact a janitor’s ability to complete assigned tasks properly within a shift.

Physical and psychological job demands and fatigue experience among offshore workers

Offshore operations are generally challenging and hazardous, and the workers are exposed to conditions that may lead to fatigue. A cross-sectional study evaluated physical and psychological job demands and their associations with fatigue among offshore workers. The offshore workers (n = 251) completed a questionnaire including demographic/job details, Multidimensional Fatigue Inventory (MFI‒20), and Job Content Questionnaire (JCQ). Data were analysed using linear regression modelling. Results indicated that the physical (particularly performing repetitive motions and applying pressure with hands and wrists) and psychological (e.g., intense task concentration and fast working) job demands were relatively high. The total mean (SD) fatigue score (MFI‒20) was 56.3 (13.9). Individual factors (Body Mass Index ‒ BMI), physical job demands (awkward working postures, frequent moving/lifting heavy objects and doing lots of physical efforts) and psychological job demands (task interruptions by other people and doing an excessive amount of work) were the main variables associated with different dimensions of fatigue in the multivariate models. While physical fatigue was only associated with the physical job demands, both physical and psychological job demands were significantly associated with mental fatigue in the multivariate context. The findings have possible implications for job design and implementation of intervention programmes to promote health and performance of the employees.