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Shoulder moments and angles during single and combined manual material handling tasks
Year:
2020
Source of publication :
Ergonomics
Authors :
Bechar, Avital
;
.
Harari, Yaar
;
.
Volume :
Co-Authors:

Yaar Harari - Department of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer Sheva, Israel ; Institute of Agricultural Engineering, Agricultural Research Organization, Bet Dagan, Israel.
Raziel Riemer - Department of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer Sheva, Israel.
Avital Bechar - Department of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer Sheva, Israel ; Institute of Agricultural Engineering, Agricultural Research Organization, Bet Dagan, Israel.

Facilitators :
From page:
1
To page:
12
(
Total pages:
12
)
Abstract:

Shoulder musculoskeletal disorders due to manual material handling tasks are common workplace injuries. Here we investigated the difference in shoulder biomechanics (moments and angles) between a single task of removing a box from a shelf (or depositing a box on a shelf) and the equivalent part of a combined task that consisted of removing, carrying and depositing boxes; that is, a single removing [depositing] task was compared with the removing [depositing] part of a combined task. We found that the peak and cumulative shoulder moments were larger during the single-task paradigm than during the equivalent part of the combined task by 26.3 and 25.5%, respectively. The two paradigms also differed in terms of shoulder angles. It is likely that the main contributors to this overestimation were differences between the single and combined tasks in terms of the lever arm (i.e. horizontal distance), the shoulder angle, and the task duration. Practitioners’ Summary: We investigated shoulder moments during single and combined manual material handling tasks. Shoulder moments were found to be smaller during combined tasks. Practitioners should consider that analysing combined tasks using estimations based on single tasks could result in an overestimation of 26.3 and 25.5% in peak and cumulative shoulder moments, respectively. Abbrevaitions: MSDs: musculoskeletal disorders; MMH: manual material handling; LMM: linear mixed model.

Note:
Related Files :
Diseases
Ergonomics
Manual material handling
Materials handling
Musculoskeletal system
Shoulder moments
Show More
Related Content
More details
DOI :
10.1080/00140139.2020.1858184
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
53031
Last updated date:
02/03/2022 17:27
Creation date:
10/01/2021 22:44
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Scientific Publication
Shoulder moments and angles during single and combined manual material handling tasks

Yaar Harari - Department of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer Sheva, Israel ; Institute of Agricultural Engineering, Agricultural Research Organization, Bet Dagan, Israel.
Raziel Riemer - Department of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer Sheva, Israel.
Avital Bechar - Department of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer Sheva, Israel ; Institute of Agricultural Engineering, Agricultural Research Organization, Bet Dagan, Israel.

Shoulder moments and angles during single and combined manual material handling tasks

Shoulder musculoskeletal disorders due to manual material handling tasks are common workplace injuries. Here we investigated the difference in shoulder biomechanics (moments and angles) between a single task of removing a box from a shelf (or depositing a box on a shelf) and the equivalent part of a combined task that consisted of removing, carrying and depositing boxes; that is, a single removing [depositing] task was compared with the removing [depositing] part of a combined task. We found that the peak and cumulative shoulder moments were larger during the single-task paradigm than during the equivalent part of the combined task by 26.3 and 25.5%, respectively. The two paradigms also differed in terms of shoulder angles. It is likely that the main contributors to this overestimation were differences between the single and combined tasks in terms of the lever arm (i.e. horizontal distance), the shoulder angle, and the task duration. Practitioners’ Summary: We investigated shoulder moments during single and combined manual material handling tasks. Shoulder moments were found to be smaller during combined tasks. Practitioners should consider that analysing combined tasks using estimations based on single tasks could result in an overestimation of 26.3 and 25.5% in peak and cumulative shoulder moments, respectively. Abbrevaitions: MSDs: musculoskeletal disorders; MMH: manual material handling; LMM: linear mixed model.

Scientific Publication
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