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Quantitative postural load assessment for whole body manual tasks based on perceived discomfort.
Ergonomics. 2005 Apr 15; 48(5):492-505.E

Abstract

Many Korean workers are exposed to repetitive manual tasks or prolonged poor working postures that are closely related to back pain or symptoms of musculoskeletal disorders. Workers engage in tasks that require not only handling of heavy materials, but also assuming prolonged or repetitive non-neutral work postures. Poor work postures that have been frequently observed in the workplaces of shipbuilding shops, manufacturing plants, automobile assembly lines and farms often require prolonged squatting, repetitive arm raising and wrist flexion and simultaneous trunk flexion and lateral bending. In most manufacturing industries, workers have to assume improper work postures repetitively, several hundreds of times per day depending on daily production rate. A series of psychophysical laboratory experiments were conducted to evaluate the postural load at various joints. A postural load assessment system was then developed based on a macro-postural classification scheme. The classification scheme was constructed based on perceived discomfort for various joint motions as well as previous research outcomes. On the basis of the perceived discomfort, postural stress levels for the postures at individual joints were also defined by a ratio scale to the standing neutral posture. Laboratory experiments simulating automobile assembly tasks were carried out to investigate the relationship between body-joint and whole-body discomfort. Results showed a linear relationship between the two types of discomfort, with the shoulder and low back postures being the dominant factor in determining the whole body postural stresses. The proposed method was implemented into a computer software program in order to automate the procedure of analysing postural load and to enhance usability and practical applicability.

Authors+Show Affiliations

Chung MK
Division of Mechanical and Industrial Engineering, Pohang University of Science and Technology, Hyoja San 31, Pohang, 790-784, Korea. mkc@postech.ac.kr
Lee I
No affiliation info available
Kee D
No affiliation info available

MeSH

HumansJointsKoreaLiftingLow Back PainMovementOccupational DiseasesPain MeasurementPostureRange of Motion, ArticularShoulder PainSoftwareStress, MechanicalWeight-Bearing

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

16040522

Citation

Chung, Min K., et al. "Quantitative Postural Load Assessment for Whole Body Manual Tasks Based On Perceived Discomfort." Ergonomics, vol. 48, no. 5, 2005, pp. 492-505.
Chung MK, Lee I, Kee D. Quantitative postural load assessment for whole body manual tasks based on perceived discomfort. Ergonomics. 2005;48(5):492-505.
Chung, M. K., Lee, I., & Kee, D. (2005). Quantitative postural load assessment for whole body manual tasks based on perceived discomfort. Ergonomics, 48(5), 492-505.
Chung MK, Lee I, Kee D. Quantitative Postural Load Assessment for Whole Body Manual Tasks Based On Perceived Discomfort. Ergonomics. 2005 Apr 15;48(5):492-505. PubMed PMID: 16040522.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Quantitative postural load assessment for whole body manual tasks based on perceived discomfort. AU - Chung,Min K, AU - Lee,I, AU - Kee,Dohyung, PY - 2005/7/26/pubmed PY - 2006/4/14/medline PY - 2005/7/26/entrez SP - 492 EP - 505 JF - Ergonomics JO - Ergonomics VL - 48 IS - 5 N2 - Many Korean workers are exposed to repetitive manual tasks or prolonged poor working postures that are closely related to back pain or symptoms of musculoskeletal disorders. Workers engage in tasks that require not only handling of heavy materials, but also assuming prolonged or repetitive non-neutral work postures. Poor work postures that have been frequently observed in the workplaces of shipbuilding shops, manufacturing plants, automobile assembly lines and farms often require prolonged squatting, repetitive arm raising and wrist flexion and simultaneous trunk flexion and lateral bending. In most manufacturing industries, workers have to assume improper work postures repetitively, several hundreds of times per day depending on daily production rate. A series of psychophysical laboratory experiments were conducted to evaluate the postural load at various joints. A postural load assessment system was then developed based on a macro-postural classification scheme. The classification scheme was constructed based on perceived discomfort for various joint motions as well as previous research outcomes. On the basis of the perceived discomfort, postural stress levels for the postures at individual joints were also defined by a ratio scale to the standing neutral posture. Laboratory experiments simulating automobile assembly tasks were carried out to investigate the relationship between body-joint and whole-body discomfort. Results showed a linear relationship between the two types of discomfort, with the shoulder and low back postures being the dominant factor in determining the whole body postural stresses. The proposed method was implemented into a computer software program in order to automate the procedure of analysing postural load and to enhance usability and practical applicability. SN - 0014-0139 UR - https://www.unboundmedicine.com/medline/citation/16040522/Quantitative_postural_load_assessment_for_whole_body_manual_tasks_based_on_perceived_discomfort_ DB - PRIME DP - Unbound Medicine ER -