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At least 1,369 records · Page 76Linked to original sources
PubMed1997

Comprehensive manual handling limits for lowering, pushing, pulling and carrying activities.

The objective of this study was to develop a set of mathematical models for manual lowering, pushing, pulling and carrying activities that would result in establishing load capacity limits to protect the lower back against occupational low-back disorders. In order to establish safe guidelines, a three-stage process was used. First, psychophysical data was used to generate the models' discounting factors and recommended load capacities. Second, biomechanical analysis was used to refine the recommended load capacities. Third, physiological criteria were used to validate the models' discounting factors. Both task and personal factors were considered in the models' development. When compared to the results from prior psychophysical research for these activities, the developed load capacity values are lower than previously established limits. The results of this study allowed the authors to validate the hypothesis proposed and tested by Karwowski (1983) that states that the combination of physiological and biomechanical stresses should lead to the overall measure of task acceptability or the psychophysical stress. This study also found that some of the discounting factors for the task frequency parameters recommended in the prior psychophysical research should not be used as several of the high frequency factors violated physiological limits.

Adult↗
PubMed2003

A fragmented patient safety concept: the structure and culture of safety management in healthcare.

Safety in healthcare organizations is often an ownerless process with responsibility falling under a myriad of departments that individually are coordinating initiatives to improve aspects of safety. In contrast, other high-hazard industries seek to institutionalize safety management as a key characteristic of organizational culture. Healthcare seeks to model its approach to patient safety on other high-hazard industry models, but without an understanding of the impact of creating a uniform approach to safety management, healthcare organizations will not implement a similar organization-wide safety culture.

Accidents, Occupational↗
PubMed2002

The effect of a fast bowling harness in cricket: an intervention study.

The influence of a bowling harness, as a training aid, was assessed as a means of modifying bowling technique. Thirty-three 13-year-old bowlers received a standardized 15 min of bowling coaching twice a week for 8 weeks. They were randomly assigned to one of two groups. The 13 participants in the intervention group used the bowling harness throughout the coaching, while also receiving verbal and visual feedback. The 20 participants in the non-harness group received the same visual and verbal feedback. Three-dimensional videography (200 Hz) of each player's bowling action enabled the calculation of transverse plane shoulder alignment counter-rotation, separation angle, lateral flexion and hyperextension of the trunk before and after the intervention. The restriction applied by the harness produced a significant reduction (P= 0.006) in separation angle and forced the bowler to adopt a position at back-foot impact that reduced the 'twist' in the spine. However, it had no effect on restricting other aspects of trunk movement during the critical phases of the bowling action. No significant long-term modifications to technique were found after the coaching intervention when players were assessed without the harness.

Adolescent↗
PubMed2003

A Swedish population-based study on the relationship between the SF-36 and health utilities to measure health in hypertension.

The aim of this study was to determine the relationship between a psychometric health-related quality-of-life instrument (the SF-36)-and two health utility measures [the time trade-off (TTO) and rating scale (RS) methods) among hypertensives in a general population. In the analyses were adjusted for comorbidity. The study was based on a postal questionnaire that was sent to a random sample of 8000 inhabitants aged 20-84 years (response rate 68%) in Uppsala County, Sweden, in 1995. The results showed only a moderate correlation between the TTO and the RS methods. The different dimensions of SF-36 were overall lower correlated with the TTO method than with the RS method. Co-morbidity was not associated with the RS or the TTO method among hypertensives. The regression equations explained 58% of the variance in RS among hypertensives. The corresponding value for the TTO method was about 20%. In conclusion, our study found that among hypertensives the SF-36 is low to moderate correlated to the TTO and RS methods. Health utilities and psychometric measures represent different attributes of health. It is therefore important to be aware of the differences between psychometric and utility measures when interpreting results from studies using different methods. More work is needed to explicate if health utilities can be obtained from the SF-36.

Adult↗
PubMed2002

Return to work following vocational rehabilitation for neck, back and shoulder problems: risk factors reviewed.

PURPOSE: The present aim was an overview of factors associated with return to work following vocational rehabilitation for problems in the neck, back, and shoulders. METHOD: Studies were identified through a systematic keyword search in databases. For inclusion, return to work had to be in focus and studies to have been published between 1980 and 2000. RESULTS AND CONCLUSION: A great number of demographic, psychological, social, medical, rehabilitation-related, workplace-related and benefit-system-related factors are associated with return to work. The different types of risk factor are associated in many ways. People with greater chances of job return after vocational rehabilitation are younger, native, highly educated, have a steady job and high income, are married and have stable social networks, are self-confident, happy with life, not depressed, have low level of disease severity and no pain, high work seniority, long working history and an employer that cares and wishes them back to the work place. Unfortunately, people with the above profile are seldom found among the long-term sick.

Back Injuries↗
PubMed2002

Three-dimensional lifting model for non-homogeneous loads.

A 3-dimensional model and analysis methodology is suggested for treating lifting tasks when unbalanced loads are involved. The paper describes the biomechanical equations that are coupled with the worker's posture geometry, to address a practical problem of non-symmetric lifting. The analysis has a dominant biomechanical modeling scope, as it contains a breakdown of the internal lifting forces resulting from posture and external loads acting on the body. The load model represents the acting forces due to unbalanced lifting, which is commonly found in industrial situations. The suggested model allows the user to simulate the influence of the practical load distribution, aiding safe design of a lifting job.

Back Injuries↗
PubMed2002

Interaction of physical and mental work.

The objective of the research was to determine the effect of mental load on the physical capacity of an individual. An experiment involving 9 combinations of lifting tasks, 1 lowering task, and 3 treadmill tasks was conducted. Heart rate was measured and maximum acceptable weight of lift was determined using the psychophysical method. A simple multiplication task was used as the mental load. The output variables were determined with and without the mental task. The results indicate that the individual's physical capacity decreased with the mental task while lifting from floor to knuckle and shoulder to reach lifting heights.

Adult↗
PubMed1989

Analysis of manual lifting tasks: a qualitative alternative to the NIOSH work practices guide.

A new method for evaluating ergonomic stresses on lifting tasks has been developed. This method utilizes the general procedures and hazard classification categories described in the National Institute for Occupational Safety and Health's (NIOSH) Work Practices Guide for Manual Lifting. The quantitative measurements of workplace dimensions and computations used by the NIOSH method to classify a job as "acceptable," "administrative controls required," or "hazardous" have been eliminated in favor of a table look-up procedure. A computer simulation was performed to compare results generated by the new method to results generated by the NIOSH method. The results of this simulation found that the new method was unbiased and was reasonably precise for most lifting activities.

Back Injuries↗
PubMed1991

Work-associated back problems: measurement problems.

Work-associated back problems are a major problem in the British National Health Service. Attempts to reduce the problem can only be judged when effective measuring and monitoring systems are available. This article highlights the problems associated with some currently available systems and describes a new system developed especially for the health service. Examples of the use of the new system are given to demonstrate its potential.

Back Injuries↗
PubMed1998

The relationship between lumbar spine load and muscle activity during extensor exercises.

BACKGROUND AND PURPOSE: There have been no previous studies that quantitatively assessed the load on the spine during extensor exercises. The purpose of our study was to investigate the loading of the lumbar spine and trunk muscle activity levels while subjects performed typical trunk extensor exercises. SUBJECTS: Thirteen male volunteers (mean age = 21.0 years, SD = 1.0, range = 19-23; mean height = 176.0 cm, SD = 6.2, range = 165-188; mean mass = 77.0 kg, SD = 7.0, range = 63-89) participated. METHODS: The subjects performed four different back exercises. Electromyographic (EMG) activity was recorded from 14 trunk muscles. The postures that corresponded to the maximum external moment were identified and quantified using rigid body modeling combined with an EMG-driven model to determine joint loading at the L4-5 joint. The exercises were then evaluated based on the lumbar spine loading and peak muscle activity levels. A reference task of lifting 10 kg from midthigh was included for comparison. RESULTS: The exercises involving active trunk extension produced the highest joint forces and muscle activity levels. Exercises involving leg extension with the spine held isometrically demonstrated asymmetrical activity of the trunk muscles, thereby reducing loads on the spine. CONCLUSION AND DISCUSSION: The back extensor exercises examined provided a wide range of joint loading and muscle activity levels. Single-leg extension tasks appear to constitute a low-risk exercise for initial extensor strengthening, given the low spine load and mild extensor muscle challenge. When combined with contralateral arm extensions, the challenge and demand of the exercise were increased. The compressive loading and extensor muscle activity levels were highest for the trunk extension exercises.

Adult↗
PubMed2005

Safe career.

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Back Injuries↗