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Estimation of physical workload of the low-back based on exposure variation analysis during a full working day among male blue-collar workers. Cross-sectional workplace study

Jakobsen, Markus Due; Sundstrup, Emil; Brandt, Mikkel; Persson, Roger LU and Andersen, Lars L. (2018) In Applied Ergonomics 70. p.127-133
Abstract

This study aims to quantify physical workload of the low-back using exposure variation analysis (EVA) during a full working day among blue-collar workers with manual lifting tasks. One hundred and ten male employees (39 warehouse workers, 27 operators, 24 postal workers and 20 slaughterhouse workers) with manual lifting tasks from 12 workplaces participated. The workers performed standardized box lifts using 5, 10, 20 and 30 kg before and after a working day. Muscular activity of the low-back was measured throughout the working day using surface electromyography (sEMG). Corresponding sEMG-values for 0–30 kg lifts were identified using linear regression. EVA at exposure levels corresponding to “lifting periods” of [1-5, 5-10, 10-20,... (More)

This study aims to quantify physical workload of the low-back using exposure variation analysis (EVA) during a full working day among blue-collar workers with manual lifting tasks. One hundred and ten male employees (39 warehouse workers, 27 operators, 24 postal workers and 20 slaughterhouse workers) with manual lifting tasks from 12 workplaces participated. The workers performed standardized box lifts using 5, 10, 20 and 30 kg before and after a working day. Muscular activity of the low-back was measured throughout the working day using surface electromyography (sEMG). Corresponding sEMG-values for 0–30 kg lifts were identified using linear regression. EVA at exposure levels corresponding to “lifting periods” of [1-5, 5-10, 10-20, 20-30 and >30] kg in time intervals [0–0.5, 0.5–1, 1-2, 2-5, 5-10, >10] sec was computed. Back inclination was measured using tri-axial accelerometers. Compared to the other job groups, the operators’ low-back muscles were exposed to more short duration “lifting periods” with varying loads and more frequent medium duration high load “lifting periods” respectively. The operators also worked more with their back inclined (>30° >60° and >90°) than the remaining job groups. Nonetheless, more than 41% of the workers performed heavy “lifting periods” that exceeded Danish lifting guidelines. This EVA demonstrates that almost half of the blue-collar workers were exposed to heavy low-back loading which puts them at risk of developing musculoskeletal disorders and low-back injury. Operators are, in particular, exposed to more short duration and medium duration “lifting periods” with varying load compared to warehouse-, postal- and slaughterhouse workers.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Borg, EMG, Low-back pain, Manual handling, Musculoskeletal disorders, Occupational lifting, Physical exertion, Self-report
in
Applied Ergonomics
volume
70
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:85042711649
ISSN
0003-6870
DOI
10.1016/j.apergo.2018.02.019
language
English
LU publication?
yes
id
f4951d9f-1c73-40a3-a9e1-b7d44d993e7a
date added to LUP
2018-03-15 10:45:11
date last changed
2018-06-15 03:00:26
@article{f4951d9f-1c73-40a3-a9e1-b7d44d993e7a,
  abstract     = {<p>This study aims to quantify physical workload of the low-back using exposure variation analysis (EVA) during a full working day among blue-collar workers with manual lifting tasks. One hundred and ten male employees (39 warehouse workers, 27 operators, 24 postal workers and 20 slaughterhouse workers) with manual lifting tasks from 12 workplaces participated. The workers performed standardized box lifts using 5, 10, 20 and 30 kg before and after a working day. Muscular activity of the low-back was measured throughout the working day using surface electromyography (sEMG). Corresponding sEMG-values for 0–30 kg lifts were identified using linear regression. EVA at exposure levels corresponding to “lifting periods” of [1-5, 5-10, 10-20, 20-30 and &gt;30] kg in time intervals [0–0.5, 0.5–1, 1-2, 2-5, 5-10, &gt;10] sec was computed. Back inclination was measured using tri-axial accelerometers. Compared to the other job groups, the operators’ low-back muscles were exposed to more short duration “lifting periods” with varying loads and more frequent medium duration high load “lifting periods” respectively. The operators also worked more with their back inclined (&gt;30° &gt;60° and &gt;90°) than the remaining job groups. Nonetheless, more than 41% of the workers performed heavy “lifting periods” that exceeded Danish lifting guidelines. This EVA demonstrates that almost half of the blue-collar workers were exposed to heavy low-back loading which puts them at risk of developing musculoskeletal disorders and low-back injury. Operators are, in particular, exposed to more short duration and medium duration “lifting periods” with varying load compared to warehouse-, postal- and slaughterhouse workers.</p>},
  author       = {Jakobsen, Markus Due and Sundstrup, Emil and Brandt, Mikkel and Persson, Roger and Andersen, Lars L.},
  issn         = {0003-6870},
  keyword      = {Borg,EMG,Low-back pain,Manual handling,Musculoskeletal disorders,Occupational lifting,Physical exertion,Self-report},
  language     = {eng},
  month        = {07},
  pages        = {127--133},
  publisher    = {Elsevier},
  series       = {Applied Ergonomics},
  title        = {Estimation of physical workload of the low-back based on exposure variation analysis during a full working day among male blue-collar workers. Cross-sectional workplace study},
  url          = {http://dx.doi.org/10.1016/j.apergo.2018.02.019},
  volume       = {70},
  year         = {2018},
}