2016-04-01 12:00 - Messages

Temporal patterns of sitting at work are associated with neck–shoulder pain in blue-collar workers

A cross-sectional analysis of accelerometer data in the DPHACTO study
BACKGROUND: Our aim was to examine the extent to which temporal patterns of sitting during occupational work and during leisure-time, assessed using accelerometry, are associated with intense neck-shoulder pain (NSP) in blue-collar workers. METHODS: The population consisted of 659 Danish blue-collar workers. Accelerometers were attached to the thigh, hip, trunk and upper dominant arm to measure sitting time and physical activity across four consecutive days. Temporal sitting patterns were expressed separately for work and leisure by the proportion of total time spent sitting in brief bursts (0-5 min), moderate (>5-20 min) and prolonged (>20 min) periods. The peak NSP intensity during the previous 3 months was assessed using a numerical rating scale (range 0-10) and dichotomized into a lower (4) NSP score. Logistic regression analyses with multiple adjustments for individual and occupational factors were performed to determine the association between brief, moderate and prolonged sitting periods, and NSP intensity. RESULTS: Time in brief bursts of occupational sitting was negatively associated with NSP intensity (adjusted OR 0.68, 95 % CI 0.48-0.98), while time in moderate periods of occupational sitting showed a positive association with NSP (adjusted OR 1.32, 95 % CI 1.04-1.69). Time in prolonged periods of occupational sitting was not associated with NSP (adjusted OR 0.78, 95 % CI 0.78-1.09). We found no significant association between brief, moderate or prolonged sitting periods during leisure, and NSP. CONCLUSION: Our findings indicate that the association between occupational sitting time and intense NSP among blue-collar workers is sensitive to the temporal pattern of sitting.

Source: Hallman DM, Mathiassen SE, Heiden M, et al. International Archieves of Occupational and Environmental Health, 2016.
http://dx.doi.org/10.1007/s00420-016-1123-9

Impact of a Sit-Stand Workstation on Chronic Low Back Pain

Results of a Randomized Trial
Objective: The aim of the study was to determine whether chronic low back pain (LBP) might be attenuated through the introduction of a sit-stand workstation (SSW) in office employees.
Methods: Participants were randomized to receive a SSW at the beginning or at the end of a 3-month study period. Participants responded to a short survey at the end of each workday and a comprehensive survey at weeks 1, 6, and 12. Surveys consisted of a modified brief pain inventory and the Roland Morris Disability Questionnaire.
Results: Forty-six university employees with self-reported chronic LBP were enrolled. Participants who were given access to a SSW reported a significant reduction in current (P?=?0.02) and worst (P?=?0.04) LBP over time.
Conclusions: Our findings support the hypothesis that chronic LBP might be improved by the introduction of a SSW in an office environment.

Source: Ognibene, Grant T.; Torres, Wilson; von Eyben, Rie; Horst, Kathleen C. Journal of Occupational & Environmental Medicine: March 2016, Volume 58, Issue 3, p. 287-293.
http://dx.doi.org/10.1097/JOM.0000000000000615

Une intervention ergonomique dans une entreprise utilisant des nanomatériaux

Cet article présente une intervention ergonomique dans une entreprise du secteur industriel amenée à fabriquer du papier contenant des nanoparticules. Les salariés du laboratoire de recherche et développement de l'entreprise, chargés d'étudier les caractéristiques du produit, ont refusé de le manipuler. À la demande du CHSCT de l'entreprise, l'INRS est intervenu afin de mieux comprendre les pratiques réelles de travail et d'aider à mettre en oeuvre, au cas par cas, une démarche de prévention adaptée au risque potentiel.

Source: L'Allain, C., Caroly, S., Drais, E., Caroly, S., Caroly, S., Landry, A., ... & Casse, C. (2016). Hygiène et Sécurité du Travail, 242, 58-62.
http://www.inrs.fr/dms/inrs/CataloguePapier/HST/TI-EC-14/ec14.pdf

Association of objectively measured occupational walking and standing still with low back pain

A cross-sectional study
Objectives: This cross-sectional study investigated the association of objectively measured walking and standing still time at work with low back pain (LBP) intensity among blue-collar workers. Design: A cross-sectional study. Methods: 187 workers attached two accelerometers for diurnal standing still and walking measurements, which were categorised using tertiles. Workers' self-reported LBP intensity (scale 0–9) was categorised into low (0–5) and high pain (6–9). Results: Of the 187 workers, 17% reported a high level of LBP. Results of the multi-adjusted logistic regression analysis demonstrated a negative association between walking and high LBP intensity (OR 0.24 CL 95% 0.07 to 0.79). The results between standing still and high LBP intensity were mixed and non-significant. Conclusion: Blue-collar workers who walk more at work tend to have low LBP. These results should be verified using objective measures in a prospective design.

Source: Nielsen CM, Gupta N, Knudsen LE, et al. Ergonomics, 2016.
http://dx.doi.org/10.1080/00140139.2016.1164901

Associations between biopsychosocial factors and chronic upper limb pain among slaughterhouse workers

Cross sectional study
BACKGROUND: Knowledge of factors associated with chronic pain is necessary for preventive strategies. The present study investigates biopsychosocial differences, with specific focus on rate of force development (RFD) and work ability, between workers with and without chronic upper limb pain. METHODS: Eighty-two male slaughterhouse workers, 49 with chronic upper limb pain and 33 pain-free controls participated in the study. Maximal muscle strength, RFD, and muscle activity was determined from fast and forceful maximal voluntary contractions for the shoulder and hand. Participants filled out a questionnaire on work ability (work ability index), work disability (Work module of DASH questionnaire), fear avoidance, and self-rated health. Additionally, pressure pain threshold (PPT) was measured in muscles of the arm, shoulder and lower leg. RESULTS: Muscle strength and RFD (determined within time intervals of 30, 50, 100, and 200 ms relative to onset of contraction) was 28 % and 58-78 % lower, respectively, in workers with chronic pain compared with pain-free controls, and paralleled by reduced muscle activity (all p < 0.001). Workers with chronic pain had lower PPT of the arm, shoulder and lower leg (p < 0.01), and reported impaired work ability index score and general health along with higher work disability and fear avoidance compared with controls (all p < 0.0001). No differences were observed between the groups in regard to age, BMI, physical activity level, job position and duration of slaughterhouse work (all p > 0.4). CONCLUSIONS: Chronic upper limb pain was paralleled by reduced neuromuscular function of the shoulder and hand along with impaired work ability, work disability and general health. Future studies on chronic pain management at the workplace should carefully consider the biopsychosocial nature of pain when designing and implementing preventive stratégies.

Source: Sundstrup E, Jakobsen MD, Brandt M, et al. BMC Musculoskeletal Disorders, 2016;17(1):104.
http://dx.doi.org/10.1186/s12891-016-0953-7  

La démarche TMS pros

Les troubles musculosquelettiques représentent la première cause de maladies professionnelles reconnues en France. Face à ce constat, l'Assurance maladie-risques professionnels a lancé auprès d'environ 8 000 entreprises une démarche de prévention structurée en quatre étapes, nommée TMS Pros.

Source: Travail et Sécurité, avril 2016, Numéro 771.
http://www.travail-et-securite.fr/ts/dossier/La%20démarche%20des%20TMS%20Pros.html

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