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Evaluation of a “walk-through” ladder top design during ladder-roof transitioning tasks
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Oct 22 2016
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Source: Appl Ergon. 59(Pt A):460-469.
[PDF-995.39 KB]
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Alternative Title:Appl Ergon
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Description: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.
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Pubmed ID:27890159
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Pubmed Central ID:PMC5127282
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Volume:59
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