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Related Experiment Video

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Cantilever Bending of Murine Femoral Necks

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Published on: January 5, 2022

Difference between male and female workers lifting the same relative load when palletizing boxes.

A Plamondon¹, C Larivière¹, D Denis¹

¹Institut de recherche Robert Sauvé en santé et en sécurité du travail (IRSST), 505 Boul. De Maisonneuve Ouest, Montréal, Québec, H3A 3C2, Canada.

Applied Ergonomics

|February 8, 2017

Summary

Female and male workers exhibit distinct lifting techniques during manual material handling (MMH), even when loads are adjusted for strength. This sex-based difference in interjoint coordination may increase injury risk for females.

Keywords:

Interjoint coordination Lifting Manual material handling Sex

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Area of Science:

Occupational Biomechanics
Ergonomics
Human Movement Science

Background:

Previous studies noted sex-based differences in manual material handling (MMH) lifting techniques.
These differences, particularly in posture and coordination, were initially attributed to strength disparities.
A key question remained whether these technique variations persisted when lifting loads relative to individual strength.

Purpose of the Study:

To investigate if female workers maintain distinct lifting biomechanics compared to males when handling loads adjusted for their respective strengths.
To determine if observed sex-based differences in lifting technique are intrinsic or solely due to absolute load differences.

Main Methods:

Participants performed box lifting tasks from a pallet.
A dynamic 3D linked segment model estimated net moments at L5/S1.
Kinematic variables and task duration were analyzed to compare male and female lifting strategies with relative loads.

Main Results:

Lifting task duration and cumulative loading were similar between sexes when using relative loads.
Significant differences persisted in interjoint coordination patterns between male and female workers.
The distinct coordination pattern observed in females with absolute loads was replicated with relative loads.

Conclusions:

Sex appears to be a significant factor influencing lifting technique, independent of absolute or relative load.
The female interjoint coordination pattern may place greater strain on posterior passive tissues during ground lifts.
Further research is needed to identify the underlying reasons for these sex-specific biomechanical patterns to develop targeted injury prevention strategies.