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Updated: May 31, 2026

Application of Design Aspects in Uniaxial Loading Machine Development

Application of Design Aspects in Uniaxial Loading Machine Development

Published on: September 19, 2018

Asymmetric lifting capabilities for different container dimensions.

Tzu-Hsien Lee¹, Te-Shiang Cheng

¹Department of Management and Information Technology, Southern Taiwan University, Tainan, Taiwan. thlee@mail.stut.edu.tw

International Journal of Occupational Safety and Ergonomics : JOSE

|June 18, 2011

Summary

Asymmetric lifting significantly reduces maximum acceptable weight of lifting (MAWL) and maximum weight of lifting (MWL). Container width also impacts lifting capacity more than length, with participants lifting 33-37% of their MWL.

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Area of Science:

Occupational Ergonomics
Biomechanics
Human Factors

Background:

Understanding lifting capacity is crucial for preventing musculoskeletal injuries in occupational settings.
Asymmetric lifting postures and container characteristics can significantly influence biomechanical load and safe lifting limits.

Purpose of the Study:

To quantify the effects of different asymmetric lifting modes (trunk rotation, body turn) on maximum acceptable weight of lifting (MAWL) and maximum weight of lifting (MWL).
To investigate the influence of container dimensions (width, length) on lifting capacity.
To determine the relationship between self-selected MAWL and determined MWL.

Main Methods:

Recruited 14 young male participants for controlled laboratory lifting tasks.
Assessed MAWL and MWL under symmetric lifting conditions as a baseline.
Evaluated lifting capacity during asymmetric lifting with trunk rotation and body turn, using various container sizes.

Main Results:

Asymmetric lifting with trunk rotation reduced MAWL by 9.1% and MWL by 17.3% compared to symmetric lifting.
Asymmetric lifting with body turn decreased MAWL by 6.1% and MWL by 6.1% relative to symmetric lifting.
Container width had a greater negative impact on MAWL and MWL than container length.

Conclusions:

Asymmetric lifting significantly compromises lifting capacity, highlighting the need for ergonomic interventions.
Container geometry, particularly width, is a critical factor affecting safe lifting limits.
Participants' self-selected MAWL represented approximately 33-37% of their maximum lifting capability.