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Versatility of Protocols for Resistance Training and Assessment Using Static and Dynamic Ladders in Animal Models
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Shoulder muscle loading and task performance for overhead work on ladders versus Mobile Elevated Work Platforms.

Denis Phelan1, Leonard O'Sullivan2

  • 1Jacobs Engineering, Ireland.

Applied Ergonomics
|April 29, 2014
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Summary

Working on Mobile Elevated Working Platforms (MEWPs) may reduce shoulder muscle loading compared to ladders for certain construction tasks. This pilot study investigated physical risk factors for musculoskeletal disorders (MSDs) in overhead work.

Keywords:
Electrical workOverheadShoulder loading

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Area of Science:

  • Occupational Health
  • Ergonomics
  • Biomechanics

Background:

  • Musculoskeletal Disorders (MSDs) are prevalent in the construction sector, with ladder use identified as a significant risk factor.
  • The impact of different work platforms (ladders vs. Mobile Elevated Working Platforms - MEWPs) on physical risk factors for MSDs during overhead work remains unclear.

Purpose of the Study:

  • To conduct a pilot study examining the effects of hand activity on shoulder muscle loading and task performance when working on ladders compared to MEWPs.
  • To hypothesize that ladder work would lead to greater muscle loading, discomfort, and reduced performance due to postural restrictions.

Main Methods:

  • A field study involved 19 experienced electricians assessing time spent on ladders versus MEWPs and perceived discomfort.
  • A simulated study with 12 participants evaluated task performance and electromyography (EMG) of shoulder muscles (anterior deltoid, upper trapezius) during cabling, assembly, and drilling tasks on both platforms.

Main Results:

  • Field study: Workers spent more time on ladders (28%) than MEWPs (6%), but tasks on MEWPs were longer (153s vs. 73s). Peak discomfort reported for shoulders, neck, and lower body.
  • Simulated study: No significant difference in task performance or discomfort between ladders and MEWPs.
  • EMG analysis revealed significant effects of platform and task on shoulder muscle activity. Ladder work showed higher peak EMG amplitudes for the anterior deltoid during cabling and assembly compared to MEWPs (32% vs. 27% MVE and 19% vs. 6% MVE, respectively).

Conclusions:

  • Working on MEWPs generally resulted in lower shoulder muscle loading for cabling and assembly tasks compared to ladders.
  • No significant difference in shoulder muscle loading between platform types was observed for drilling tasks.
  • Findings suggest MEWPs may offer ergonomic benefits by reducing shoulder muscle strain in specific overhead construction activities.