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Recurrent back pain during working life and exit from paid employment
A 28-year follow-up of the Whitehall II Study Objectives To examine the impact of recurrent, as compared with single, reports of back pain on exit from paid employment over decades of follow-up. Methods The study sample was from the British Whitehall II Study cohort (n=8665, 69% men, aged 35–55 at baseline), who had provided information about their reports of back pain between 1985 and 1994. Data about exit from paid employment (health-related and non-health related exit, unemployment and other exit) were collected between 1995 and 2013. Repeated measures logistic regression models were fitted...
The influence of external load configuration on trunk biomechanics and spinal loading during sudden loading
Sudden loading is a major risk factor for work-related lower back injuries among occupations involving manual material handling (MMH). The current study explored the effects of external weight configuration on trunk biomechanics and trunk rotational stiffness in the sagittal plane during sudden loading. Fifteen asymptomatic volunteers experienced sudden loadings using the same magnitude of weight (9 kg) with two different configurations (medially- or laterally-distributed) at three levels of height (low, middle and high). Results of this study showed that the medially distributed weight...
Surveillance de la lombalgie en lien avec le travail
Comparaison de quatre sources de données et perspectives pour la prévention •Quatre sources de données sur les lombalgies en lien avec le travail sont comparées dans les Pays de la Loire : trois issues du réseau multi-volets de surveillance épidémiologique des TMS de Santé publique France et de l’Université d’Angers, et une issue du système de réparation des maladies professionnelles de l’Assurance maladie. •Pour chaque source, les secteurs d’activité prioritaires pour la prévention...
Surface electromyography for risk assessment in work activities designed using the “revised NIOSH lifting equation”
The aims of this study were: to identify surface electromyography (sEMG)-based indices of trunk muscles acquired during the execution of lifting tasks designed using the revised NIOSH lifting equation and featuring a progressively increasing lifting index (LI); to study changes of these indices in relation to the LI; to evaluate the relationship between the identified indices and forces (FL5−S1) and moments (ML5−S1) at the L5-S1 joint. sEMG, kinematic and kinetic data of 20 male workers were recorded in three conditions. We computed the average rectified value (ARV), root mean square...
How does the biomechanical exposure of the upper body in manual box handling differ from exposure in other tasks in the real industrial context?
The assessment of biomechanical exposure during handling tasks in relation to other activities that are performed in industrial settings can be crucial to understand the biomechanical demands of manual box handling for the upper limbs. This study aims to evaluate the representativeness of the handling task to the upper body in comparison with the other tasks in a real setting, compare the biomechanical exposure between tasks, and identify the differences in exposure during manual box handling from job exposure. Twelve workers had biomechanical exposure assessed through trapezius muscle activity...
Can beliefs about musculoskeletal pain and work be changed at the national level?
Prospective evaluation of the Danish national Job & Body campaign Using a mixture of networking activities, workplace visits and a mass media campaign, the Danish national Job & Body health campaign improved beliefs about musculoskeletal pain and work among public-sector employees in Denmark. Intensive and long-term national campaigns may be a strategically important tool against musculoskeletal disorders and their consequences in the population. Source: Andersen, L. L., Geisle, N., & Knudsen, B. (2017). Scand J Work Environ Health . http://dx.doi.org/10.5271/sjweh.3692
NIOSH Lifting Equation App: NLE Calc
The National Institute for Occupational Safety and Health (NIOSH) Lifting Equation mobile application, NLE Calc, is a tool to calculate the overall risk index for single and multiple manual lifting tasks. This application provides risk estimates to help evaluate lifting tasks and reduce the incidence of low back injuries in workers. Source: https://www.cdc.gov/niosh/topics/ergonomics/nlecalc.html
Development and validation of an easy-to-use risk assessment tool for cumulative low back loading
The Lifting Fatigue Failure Tool (LiFFT) Recent evidence suggests that musculoskeletal disorders (MSDs) may be the result of a fatigue failure process in affected tissues. This paper describes a new low back exposure assessment tool (the Lifting Fatigue Failure Tool [LiFFT]), which estimates a “daily dose” of cumulative loading on the low back using fatigue failure principles. Only three variables are necessary to derive the cumulative load associated with a lifting task: the weight of the load, the maximum horizontal distance from the spine to the load, and the number of repetitions...
Pushing and pulling: An assessment tool for OHS practitioners
A tool has been developed for supporting practitioners when assessing manual pushing and pulling operations based on an initiative by two global companies in the manufacturing industry. The aim of the tool is to support occupational health and safety practitioners in risk assessment and risk management of pushing and pulling operations in the manufacturing and logistics industries. It is based on a nine-multiplier equation that includes a wide range of factors affecting an operator's health risk and capacity in pushing and pulling. These multipliers are based on psychophysical, physiological...
Association between occupational lifting and day-to-day change in low-back pain intensity based on company records and text messages
Most previous studies assessing the association between physical workload and development of low-back pain have used self-reports for exposure. Using company records for quantifying exposure, this study shows that consecutive working days and higher workload are associated with acutely increased low-back pain. Source: Andersen LL, Fallentin N, Ajslev JZN, Jakobsen MD, Sundstrup E. Scand J Work Environ Health , 2016. http://dx.doi.org/10.5271/sjweh.3592
Evaluating the low back biomechanics of three different office workstations: Seated, standing, and perching
The objective of this study was to evaluate how different workstations may influence physical behavior in office work through motion and how that may affect spinal loads and discomfort. Twenty subjects performed a typing task in three different workstations (seated, standing, and perching) for one hour each. Measures of postural transitions, spinal loads, discomfort, and task performance were assessed in order to understand the effects of workstation interaction over time. Results indicated that standing had the most amount of motion (6–8 shifts/min), followed by perching (3–7 shifts...
Estimation du chargement au dos
Développement d'une méthode ambulatoire intégrant la cinématique du dos et de l'électromyographie De nombreux travailleurs1 sont atteints de maux de dos chaque année. La région lombaire est de loin celle qui est la plus fréquemment atteinte, et ce type de troubles musculosquelettiques est principalement occasionné par des efforts excessifs, surtout en soulevant quelque chose, et les chargements aux tissus de la colonne qu'ils engendrent. Il n'existe pas de méthode de mesure directe de ces chargements qui puisse...
Social support modifies association between forward bending of the trunk and low-back pain
Cross-sectional field study of blue-collar workers Objectives: This study aimed to investigate the association between forward bending of the trunk and low-back pain intensity (LBPi) among blue-collar workers in Denmark as well as whether the level of social support modifies the association. Methods: In total, 457 workers were included in the study. The forward bending of ≥30° was computed from accelerometer recordings for several consecutive days during work, categorized into long (highest tertile) and short–moderate (remaining tertiles) duration. LBPi was measured on a 0–10...
Estimation du chargement lombaire au moyen de modèles biomécaniques articulaires
Évaluation et application Les troubles musculosquelettiques (TMS) et tout particulièrement les affections vertébrales constituent un fardeau autant pour la société que pour les personnes qui en sont affectées. Au Québec, le nombre d'affections vertébrales s'établissait en 2011 à 21 228 et elles représentaient près de 30 % de l'ensemble des lésions professionnelles indemnisées. C'est la région lombaire de la colonne vertébrale qui est la zone la plus touchée (60...
Revised NIOSH Lifting Equation May generate spine loads exceeding recommended limits
The 1991 NIOSH Lifting Equation (NLE) is widely used to assess the risk of injury to spine by providing estimates of the recommended weight limit (RWL) in hands. The present study uses the predictive equations developed based on a detailed trunk musculoskeletal biomechanical model to verify whether the RWL generates L5-S1 loads within the limits (e.g., 3400 N for compression recommended by NIOSH and 1000 N for shear recommended in some studies). Fifty lifting activities are simulated here to evaluate the RWL by the NLE and the L5-S1 loads by the predictive equations. In lifting activities involving...
The effect of the presence and characteristics of an outlying group on exposure–outcome associations
Objectives: Physical exposures (eg, lifting or bending) are believed to be risk factors for low-back pain (LBP), but the literature is inconsistent. Exposure and LBP prevalence differ considerably between occupations, and exposure–outcome associations could be severely modified by the presence of particular occupational groups. We aimed to investigate the influence of such outlying groups on the properties of associations between exposure and LBP. Methods: Lifting and trunk flexion were observed for 371 of 1131 workers within 19 groups. LBP was obtained from all workers during three follow...
Effects of work experience on work methods during dynamic pushing and pulling
Pushing and pulling are potential risk factors for work-related low back disorders (WRLBDs). While several studies have evaluated differences in work methods related to work experience, such evidence for dynamic pushing and pulling is limited. Eight novices and eight experienced workers completed dynamic push/pull tasks using a cart weighted to 250% of individual body mass in two different configurations (preferred vs. elbow handle heights). Multiple measures [hand forces, torso kinematics and kinetics, and required coefficient of friction (RCOF)] were obtained to assess WRLBD and slip risks. Experienced...
Tracking Low Back Problems in a Major Self-Insured Workforce
Toward Improvement in the Patient's Journey Objective: To assess the cost outcomes of treatment approaches to care for back problems in a major self-insured workforce, using published guidelines to focus on low back pain. Methods: Longitudinally tracked episodes of three types of International Classification of Diseases, Ninth Revision diagnosis code–identified back problems (n = 14,787) during 2001 to 2009. Identified five patterns of care on the basis of the first 6 weeks of claims and compared their total costs per episode with tests that included splits by episode type and duration...
Are work disability prevention interventions effective for the management of neck pain or upper extremity disorders?
A systematic review by the Ontario Protocol for Traffic Injury Management (OPTIMa) Collaboration Purpose We conducted a systematic review to critically appraise and synthesize literature on the effectiveness of work disability prevention (WDP) interventions in workers with neck pain, whiplash-associated disorders (WAD), or upper extremity disorders. Methods We searched electronic databases from 1990 to 2012. Random pairs of independent reviewers critically appraised eligible studies using the Scottish Intercollegiate Guidelines Network criteria. Scientifically admissible studies were summarized...
Évaluation biomécanique des déterminants de la stabilité lombaire - Étude exploratoire
Les maux de dos affectent entre 58 % et 84 % des gens à un moment donné de leur vie, ce qui en fait le plus important problème de santé dans les pays industrialisés. Selon un rapport publié en 2008 par la CSST, les maux de dos représentent près de 30 % de l'ensemble des lésions professionnelles indemnisées. La région lombaire est touchée dans 60 % des cas des affections vertébrales survenues entre 2004 et 2007. Il devient donc impératif de développer des outils de mesure valides et fidèles...
Evaluating Methods to use the Virtual Corset™ Inclinometer for Trunk Posture and Spinal Compression Measurements
Back posture and spinal compression – the force that squeezes the bones in our spine together as we sit, walk, stand, play, and work – are recognized risk factors for back injury among workers. In order to learn more about the relationships between workplace risk factors and back injury, researchers need to able to evaluate back posture and spinal compression during work for large numbers of individuals. There are sophisticated methods that can measure these risk factors but they are costly, time consuming, and impractical in the field. Instead, field studies tend to use simplified...
Évaluation de la validité de construit de tests portant sur l’endurance et les réponses réflexes des muscles du dos chez des sujets présentant une lombalgie chronique
Le présent projet de recherche s'intéresse aux lombalgies qui représentent un des plus importants problèmes de santé dans les pays industrialisés. Il y a un grand besoin de développer des outils de mesure valides et fidèles permettant de quantifier la présence de déficiences ou d'incapacités associées à la colonne vertébrale. Les mesures de l'endurance et des réponses réflexes des muscles dorsolombaires représentent deux de ces mesures pour lesquelles un protocole d'évaluation...
Comparaison de deux modèles biomécaniques articulaires dans l’évaluation du chargement lombaire
Les risques de blessures au dos lors d'activités au travail demeurent encore aujourd'hui très élevés. Ces risques semblent s'accroître lorsque la charge supportée par les tissus du dos augmente lors, par exemple, de travaux de manutention. Il n'existe pas de façon directe d'évaluer le chargement interne des tissus et le meilleur moyen consiste actuellement à utiliser des modèles biomécaniques articulaires. http://www.irsst.qc.ca/files/documents/PubIRSST/R-620.pdf

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