2017-04-01 12:00 - Messages

Effects on musculoskeletal pain from “Take a Stand!”

A cluster-randomized controlled trial reducing sitting time among office workers
The intervention in Take a Stand! was effective in reducing sitting time among office workers, additionally this study shows that pain in neck-shoulders was reduced after the 3-month intervention period. For other pain sites, there were no changes, but for total pain score there was a slight reduction. This is relevant as musculoskeletal pain is very common among office workers.

Source: Danquah, I. H., Kloster, S., Holtermann, A., Aadahl, M., & Tolstrup, J. S. (2017). Scandinavian Journal of Work, Environment & Health.

Évaluer les interventions de prévention des RPS - TMS

Ce guide pratique accompagne étape par étape les intervenants dans leur démarche d'évaluation. Il propose des apports méthodologiques sur l'évaluation, des exemples illustratifs et une grille regroupant les conséquences potentielles des démarches de prévention des risques psychosociaux (RPS) et trouble musculosquelettiques (TMS). Il est accompagné du " Document d'évaluation de mon intervention " que l'intervenant pourra renseigner au fur et à mesure de sa démarche.
La démarche proposée permet de mesurer un large éventail des effets qu'une intervention produit et de les analyser au regard des méthodes mises en oeuvre et de la singularité des contextes rencontrés. Elle permet ainsi de mettre en valeur toute la richesse, la diversité et la complexité des interventions de prévention. 

Source: http://www.inrs.fr/media.html?refINRS=CC%2018

Human Body Mechanics of Pushing and Pulling: Analyzing the Factors of Task-related Strain on the Musculoskeletal System

The purpose of this review is to name and describe the important factors of musculoskeletal strain originating from pushing and pulling tasks such as cart handling that are commonly found in industrial contexts. A literature database search was performed using the research platform Web of Science. For a study to be included in this review differences in measured or calculated strain had to be investigated with regard to: (1) cart weight/ load; (2) handle position and design; (3) exerted forces; (4) handling task (push and pull); or (5) task experience. Thirteen studies met the inclusion criteria and proved to be of adequate methodological quality by the standards of the Alberta Heritage Foundation for Medical Research. External load or cart weight proved to be the most influential factor of strain. The ideal handle positions ranged from hip to shoulder height and were dependent on the strain factor that was focused on as well as the handling task. Furthermore, task experience and subsequently handling technique were also key to reducing strain. Workplace settings that regularly involve pushing and pulling should be checked for potential improvements with regards to lower weight of the loaded handling device, handle design, and good practice guidelines to further reduce musculoskeletal disease prevalence.

Source: Argubi-Wollesen, A., Wollesen, B., Leitner, M., & Mattes, K. (2017). Safety and Health at Work, 8(1), 11-18.

Integration of active pauses and pattern of muscular activity during computer work

Submaximal isometric muscle contractions have been reported to increase variability of muscle activation during computer work; however, other types of active contractions may be more beneficial. Our objective was to determine which type of active pause vs. rest is more efficient in changing muscle activity pattern during a computer task. Asymptomatic regular computer users performed a standardised 20-min computer task four times, integrating a different type of pause: sub-maximal isometric contraction, dynamic contraction, postural exercise and rest. Surface electromyographic (SEMG) activity was recorded bilaterally from five neck/shoulder muscles. Root-mean-square decreased with isometric pauses in the cervical paraspinals, upper trapezius and middle trapezius, whereas it increased with rest. Variability in the pattern of muscular activity was not affected by any type of pause. Overall, no detrimental effects on the level of SEMG during active pauses were found suggesting that they could be implemented without a cost on activation level or variability.

Source: St-Onge, N., Samani, A., & Madeleine, P. (2017). Ergonomics.

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