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Journal Article

Citation

Simeonov P, Hsiao H, Powers J, Ammons D, Kau T, Cantis D, Zwiener J, Weaver D. Appl. Ergon. 2017; 59: 460-469.

Affiliation

Division of Safety Research, National Institute for Occupational Safety and Health, 1095 Willowdale Rd., Morgantown, WV 26505, USA.

Copyright

(Copyright © 2017, Elsevier Publishing)

DOI

10.1016/j.apergo.2016.10.008

PMID

27890159

PMCID

PMC5127282

Abstract

This study evaluated the effect of an extension ladder "walk-through" top design on kinetic and kinematic behaviors and the outward destabilizing forces induced on the ladder during transitioning at elevation. Thirty-two male participants performed stepping tasks between a ladder top and a roof at simulated elevation in a surround-screen virtual-reality system. The experimental conditions included a "walk-through" and a standard ladder top section supported on flat and sloped roof surfaces. Three force platforms were placed under the ladder section and in the roof to measure propulsion forces during transitions. A motion measurement system was used to record trunk kinematics. The frictional demand at the virtual ladder base was also calculated. The results indicate that under optimal ladder setup (angle 75.5 °), the frictional demand at the ladder base remains relatively small for all experimental conditions. Also, the "walk through" ladder top eased the ladder-to-roof transitions but not the roof-to-ladder transitions.

Published by Elsevier Ltd.


Language: en

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