TY - JOUR
T1 - Estimation of physical workload of the low-back based on exposure variation analysis during a full working day among male blue-collar workers
T2 - Cross-sectional workplace study
AU - Jakobsen, Markus Due
AU - Sundstrup, Emil
AU - Brandt, Mikkel
AU - Persson, Roger
AU - Andersen, Lars L.
N1 - Copyright © 2018 The Authors. Published by Elsevier Ltd.. All rights reserved.
PY - 2018/7
Y1 - 2018/7
N2 - 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.
AB - 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.
KW - Borg
KW - EMG
KW - Low-back pain
KW - Manual handling
KW - Musculoskeletal disorders
KW - Occupational lifting
KW - Physical exertion
KW - Self-report
UR - http://www.scopus.com/inward/record.url?scp=85042711649&partnerID=8YFLogxK
U2 - 10.1016/j.apergo.2018.02.019
DO - 10.1016/j.apergo.2018.02.019
M3 - Journal article
C2 - 29866301
SN - 0003-6870
VL - 70
SP - 127
EP - 133
JO - Applied Ergonomics
JF - Applied Ergonomics
ER -