Does team lifting increase the variability in peak lumbar compression in ironworkers?

Ironworkers frequently perform heavy lifting tasks in teams of two or four workers. Team lifting could potentially lead to a higher variation in peak lumbar compression forces than lifts performed by one worker, resulting in higher maximal peak lumbar compression forces. This study compared single-worker lifts (25-kg, iron bar) to two-worker lifts (50-kg, two iron bars) and to four-worker lifts (100-kg, iron lattice). Inverse dynamics was used to calculate peak lumbar compression forces. To assess the variability in peak lumbar loading, all three lifting tasks were performed six times. Results showed that the variability in peak lumbar loading was somewhat higher in the team lifts compared to the single-worker lifts. However, despite this increased variability, team lifts did not result in larger maximum peak lumbar compression forces. Therefore, it was concluded that, from a biomechanical point of view, team lifting does not result in an additional risk for low back complaints in ironworkers.     

Comparison of a simulated versus work environment lifting task on L5/S1 compression forces

Since a patient's ability to perform simulated work activities guides return-to-work decisions, a significant question to address is whether the simulated work environment accurately reflects the actual work environment. Work hardening programs have been used extensively as a method of rehabilitating workers to return to their pre-injury functioning levels. Re-training workers to lift boxes is a common method used to simulate the work environment. Although very few boxes used in the real work environment have handles, boxes with handles are often used in the simulated work environment. The difference in compression forces at the L5/S1 joint while lifting boxes with and without handles was investigated. The Lift Trak Motion Analysis system was used to estimate lumbar isometric compression forces exerted while lifting a 20-pound (9.07-kg) box. The results indicated that estimates of compression forces when lifting a box without handles were significantly different (p < 0.01) than when lifting the same box with handles. Based on these results, it is recommended that work hardening professionals carefully re-evaluate the simulated work environments currently being used for treatment.     

Gender involvement in manual material handling (mmh) tasks in agriculture and technology intervention to mitigate the resulting musculoskeletal disorders

The lifting and carrying of loads in agriculture on small landholdings are unavoidable. Rural communities often lack access to appropriate technologies which may result in various health hazards. The objective was to study gender participation in agricultural activities involving manual material handling tasks, to assess MSDs experienced in various MMH tasks and to evaluate traditional method and designed technology. The study was conducted on 100 agricultural workers. Data on gender participation in MMH tasks in household, animal husbandry and agriculture and resulting MSDs was gathered. Pre and post assessment of technology intervention was done for NIOSH Lifting Index, QEC, and RPE. The results revealed greater susceptibility of females to musculoskeletal problems in most of the household and animal husbandry tasks. The hand trucks designed were pushing type with power grasp handle. The respondents were advised to carry 5 kg of weight per lift instead of lifting more weight in one lift/minute while filling the hand truck. By decreasing the weight and increasing the number of lifts per minute the respondents were seen falling in green zone indicating significant reduction in NIOSH lifting index. QEC scores concluded that for filling the hand truck 5 kg of weight should be carried to keep the exposure level low.     

Reliability of the JobFit System Pre-Employment Functional Assessment Tool

Functional capacity testing in the pre-employment or post-offer phase of recruitment is increasing in popularity as a preventative tool for controlling sprains and strains in the workplace. The purpose of this study is to determine the reliability of the JobFit System Pre-Employment Functional Assessment (PEFA) as a whole, or in parts, as a precursor for a validity study investigating the relationship between PEFA results and workplace injury rates and severity. A group of 28 healthy male coal mine employees were videotaped whilst they participated in a generic JobFit System Pre-Employment Functional Assessment (PEFA) including tests of aerobic physical fitness, balance, postural tolerances and material handling tolerances. Twenty participants performed a second trial. The test component scores and overall PEFA scores were compared between trials (test-retest, intra-rater) and assessors (inter-rater) to determine their reliability expressed in terms of ICC. Using an ICC score of > 0.75 as good and > 0.90 as excellent, in conjunction with percentage agreement a good to excellent reliability rating was allocated to the overall PEFA score, floor to bench lift, bench to overhead lift, bilateral carry and climbing. A moderate to good rating was recorded for bench to shoulder lifts, reaching forward, reaching overhead and stooping. A poor to moderate rating was recorded for squatting, balance and fitness tests. Test-retest scores were typically lower than intra-tester and inter-tester scores. ICC scores should be interpreted with consideration of their limitations and in conjunction with the actual test results.     

Reliability of independent observer judgments of level of lift effort in a kinesiophysical Functional Capacity Evaluation

Functional Capacity Evaluation includes manual materials handling as a primary component. Return to work decisions are often made or influenced by both the heaviest amount of weight that can be safely lifted and the weight that can be handled repetitiously. Kinesiophysical observational criteria were developed to allow trained judges to categorize lifting in order to identify the category of lift effort. Bothinter rater and intrarater reliability were high. When light or heavy categories were isolated for accuracy there were no errors in judge's ratings.     

The evaluation of team lifting on physical work demands and workload in ironworkers

Lifting and carrying heavy loads occur frequently among ironworkers and result in high prevalence and incidence rates of low back complaints, injuries and work-disability. From a health perspective, little information is available on the effect of team lifting on work demands and workload. Therefore, the objective of this study was to compare the effects of team lifting of maximally 50 kg by two ironworkers (T50) with team lifting of maximally 100 kg by four ironworkers (T100). This study combined a field and laboratory study with the following outcome measures: duration and frequency of tasks and activities, energetic workload, perceived discomfort and maximal compression forces (Fc peak) on the low back. The physical work demands and workload of an individual iron worker during manual handling of rebar materials of 100 kg with four workers did not differ from the manual handling of rebar materials of 50 kg with two workers, with the exception of low back discomfort and Fc peak. The biomechanical workload of the low back exceeded for both T50 and T100 the NIOSH threshold limit of 3400N. Therefore, mechanical transport or other effective design solutions should be considered to reduce the biomechanical workload of the low back and the accompanying health risks among iron workers.     

The effects of back belts and load on selected lifting kinematics during a simulated patient transfer

This study used two dimensional biomechanical analysis to examine the effects of back belts and lifting load on selected lifting kinematics during a simulated patient transfer. A human manikin placed in a sitting position was attached to a customized lifting apparatus which controlled the lifting load and direction of the manikin. Eighteen female participants, between the age of 21 and 27, completed six lifts (sit to stand transfers) of the manikin. Three lifts were completed at the 30 lb load condition (no belt, belt 1 and belt 2) and three lifts were completed at the 50 lb load condition (no belt, belt 1 and belt 2). A doubly two way ANOVA found a significant main effect for the belt condition, F(12,6)=10.06, P=0.002. There was no significant effect for load and no interaction existed between belt and load. The results revealed a significant decrease in trunk flexion when participants wore the wider (nine inch) belt during the 30~lb lifts when compared to the no belt trials. No significant differences were found in trunk flexion means with the narrower width (six inch) belt. No significant differences were found in trunk spinal flexion with either belt condition during the 50 lb lifts. There were no significant differences found in either of the belts in the means of lifting time, knee flexion, elbow flexion, forward displacement of the lifter's center of mass, and the lifter's maximum center of mass velocity. The results suggest that wider back belts may be more effective at reducing spinal flexion during patient lifting under moderate load conditions when compared to narrower back belts and to no-belted controls.     

Predictive validity of a functional capacity evaluation: the physical work performance evaluation

The predictive validity of a Functional Capacity Evaluation, the Physical Work Performance Evaluation (PWPE), was examined in 30 workers compensation patients with musculoskeletal dysfunction who participated in an industrial rehabilitation program. Return-to-work recommendations were made by comparing the discharge PWPE to the physical requirements of the job. Kappa coefficients were used to compare PWPE recommendations to actual work at discharge, 3 months and 6 months. Substantial agreement was found between PWPE recommendations at all three follow-up points. This study provides preliminary evidence in support of the predictive validity of the PWPE for making return-to-work recommendations at the conclusion of an industrial rehabilitation program.     

Work injury rehabilitation in Guangzhou: 380 case cohort study

Work injury rehabilitation is a new concept in Mainland China. In 2001, the first work injury rehabilitation centre was established in Guangzhou under the management of the Guanghzhou Bureau of Labour and Security. This paper reviews the profile of a cohort of workers with injuries who received rehabilitation services at this centre. The changes in the physical capacity, daily function, and quality of life of the workers with injuries before and after the treatment services were also reviewed. A total of 380 were extracted from the database which occupied 79% of the total patient population admitted to the centre between 2003 to 2004. The assessment results suggested that workers with injuries showed increases in physical capacity in terms of the range of motion, muscle strength and walking tolerance. The daily functioning by using Barthel Index was also improved. Quality of life assessed with the WHOQOL also demonstrated an increase in the physical and psychological domains. Work injury rehabilitation in Guangzhou is at its infancy stage. The cooperation between the rehabilitation centre, employers and workers is of the utmost importance for a successful return to work outcome. The workers' compensation and rehabilitation policy also dictates the future of success of the rehabilitation services.     

The assessment of functional work capacity in the South African mining industry

Overall physical work fitness is a prerequisite in numerous industries. Apart from improved productivity, it remains fundamental with regards to the maintenance of good health and safety. To address worker fitness in the mining industry, AngloGold Ashanti and Anglo Platinum Mining Houses developed a Functional Work Capacity (FWC) test battery. The FWC test battery consists of 19 work simulations representing the required functional work capacity to cope with all types of physical work tasks and work environments in the mining industry. This assessment tool is not only used to evaluate injured or medically affected workers for alternative placement but also to ensure that the new employee is placed in a job matching his physical capacity. This paper reviews the design process and application of the FWC test battery in the mining industry.     

Working with industry: Matching the work and worker

The benefits of matching the work to the worker include injury prevention, decreased re-injury rates, decreased turnover, and improved production. This article will discuss three components of an employer safety and health program that allows employers to realize these goals. The program involves partnering with trained health professionals who provide Functional Capacity Evaluation, Functional Job Analysis, and Prework Screening services onsite as means to achieving appropriate matches of the workers to the work.     

Functional capacity evaluation: Ecological validity of three static endurance tests

Functional Capacity Evaluation's (FCE's) are designed to measure the functional capacity of injured workers. Static endurance tests are integrated aspects of FCE's. Little is known about the validity of the tests. In this study, three static endurance tests (overhead work, crouching and kneeling) of the Isernhagen Work Systems FCE are studied for ecological validity. By manipulating the environment in an experiment using three different conditions (normal, loud noise, high production requirement), the ecological validity of the tests was investigated. Results: the different conditions did not seem to influence the holding times, the perceived exertion and the productivity of the subjects. The results are discussed and it is concluded that the three static endurance tests meet conditions of ecological validity. In order to be able to state that the tests of the IWS FCE are ecologically valid, more research is needed to enable a generalization.     

Ergonomic basket design to reduce cumulative trauma disorders in tea leaf plucking operation

Work related musculoskeletal disorders are seen as an indicating parameter of occupational stress among the women workers engaged in tea leaf plucking operation. The hand plucking (no mechanized plucking is practiced in Assam) being a highly repetitive task requires forceful exertions to reach to the distant periphery of the tea bushes and mechanical compression (pressing against hard surfaces). Specifically it aggravates with awkward positions adopted. The current research addresses to minimize the risk factors associated with CTDs and to ascertain the role of ergonomic design development in improving the situation. Women workforce engaged in tea industry in Assam suffer from back, shoulder, arm and finger pains. Workers perform the activity for 440 minutes in the entire shift with one hour lunch break in between in the garden itself. An ergonomic investigation aiming at studying the strain index of plucking operation in tea industry was conducted. While performing the operation workers were found to assume unnatural posture which is static as well as highly dynamic with a load (tea leaf collecting basket up to weight of 30 kg when filled with plucked leaves) at back. With gradual increment of load and pain though the load is released intermittently the strain level found to remain at a high level. The total QEC scores found for plucking activity was 110 out of 138. To improve the situation and to reduce the work related upper limb disorder (WRULD) an ergonomically designed basket was conceived and trial results showed improvements. The newly designed plucking basket fits the back curvature of the workers well, which keeps the basket in place unlike the existing round basket. The new basket is light in weight having more leaf capacity. Significant reduction in energy expenditure and MSDs suffered was observed while using improved basket over existing basket.     

Impacts of introducing a new tool for the manual harvesting of sugar cane: the ergonomic analysis contribution

The purpose of this study was to evaluate the impact of introduction a new work tool on health and productivity of manual harvesting sugarcane workers. In this study it was performed aErgonomic Work Analysis (EWA) to analyze the work tool changes.The study included sugarcane workers, drivers, fiscals, and technical's safety at work.During the analysis process, 134 questionnaires were applied,aimed to identify the constraints that such workers are submitted,to evaluate the tool introduced, in order to propose modifications to improve it.The results showed a decrease in perceived exertion and discomfort, without compromising the cut quality. The main contributions of Ergonomic Work Analysis were the possibility of bringing the logic of the worker, in order to understand the inherent real work characteristics, to the process of developing the new tool. Besides, it was also noted that this methodology, based on the analysis workers activity in a real usage, as an application tool in design projects, providing innovations from the workers perspective.     

Evaluation and redesign of manual material handling in a vaccine production centre's warehouse

This study was conducted in a warehouse at a vaccine production centre where improvement to existing storage and working conditions were sought through the construction of a new refrigerated store section (2-8C°). Warehousing tasks were videotaped and ergonomics analysis tools were used to assess the risk of developing MSDs. Specifically, these tools were the Rapid Entire Body Assessment (REBA) and the NIOSH equation. The current plant layout was sketched and analyzed to find possible targets for improvement trough the application of general work space design and ergonomics principles. Seven of the eight postures evaluated with REBA had a total score between 8 and 10, meaning a high risk, and only one was at a medium risk level. Nine of the eleven manual material handling tasks analyzed with the NIOSH equation had a Lifting Index between 1.14 and 1.80 and two had a recommended weight limit of 0 kg, indicating a need for job redesign. Solutions included the redesign of shelves, the design of a two-step stair and a trolley with adjustable height; also, changes in work methods were proposed by introducing a two-workers lifting strategy and job rotation, and, finally, a restructuring of plant layout was completed.     

Evaluating the outcomes of intensive critical thinking instruction for social work students

Social workers require critical thinking skills to analyse situations which present themselves in the course of professional work and in making decisions about the most appropriate forms of social work intervention. The 4-year Bachelor of Social Work degree at the University of Newcastle, Australia, introduced an intensive instructional unit on critical thinking at the beginning of the final year of the course. The Cornell Critical Thinking Test, the Ennis—Weir Essay Test and a qualitative student self-appraisal were administered to students in the fourth year of the degree prior to the intensive instructional unit on critical thinking and again after the unit had been completed. From the results it was concluded that explicit and concentrated instruction on critical thinking assisted social work students to improve their critical thinking abilities and to identify principles of critical thinking.     

Exploring MSW students’ and social workers’ orientation toward the evidence-based practice process

The aim of this exploratory study was to assess whether practicing social workers currently enrolled in Master Social Work (MSW) programs (hereafter referred to as MSW students) were more oriented to the evidence-based practice (EBP) process and more engaged in it than practicing social workers who are not currently enrolled in MSW programs (hereafter referred to as social workers) in the Netherlands. Data were collected from MSW students (n = 32) and from social workers (n = 341) using the EBP Process Assessment Scale. MSW students reported a stronger orientation toward the EBP process, more positive attitudes toward EBP, more familiarity with EBP and more intentions to engage in EBP than social workers did, however, they were less positive about the feasibility of implementing EBP in practice. These preliminary results suggest that there are grounds for optimism about MSW students’ acceptance of and engagement in the EBP process. Implications for social work education are discussed.     

Analysis of the lifted weight including height and frequency factors for workers in Colombia

Factors related to the height of the load and the frequency of handling have become a way to predict the acceptable standard weight lifted for workers whose main task is the manual lifting of materials and measuring the conditions is important to determine a maximum weight lifted. This study was conducted to twenty (20) workers between eighteen (18) and forty (40) years old with a minimum six months experience and belonging to the warehouse and packaging area of a dairy products company. Consideration was given to three different heights such as knuckle, shoulder and total height as well as frequencies of 2, 4 and 6 times per minute. Average values for lifted weight were 17.9306 ± 2.37 kg. The conclusions and recommendations included a review of legislation related to Colombian maximum acceptable weight of lifting due to the current law does not match the acceptable weight handled in this research.