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Related Experiment Video

Updated: May 20, 2026

A Training Program Using an Agility Ladder for Community-Dwelling Older Adults
14:13

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Published on: March 7, 2020

Factors affecting extension ladder angular positioning.

Peter Simeonov1, Hongwei Hsiao, In-Ju Kim

  • 1Protective Technology Branch, Division of Safety Research, NIOSH, 1095 Willowdale Rd., MS G-800, Morgantown, WV 26505, USA. psimeonov@cdc.gov

Human Factors
|July 10, 2012
PubMed
Summary
This summary is machine-generated.

Two anthropometric methods improve extension ladder (ladder) positioning, but require more time and may not always achieve optimal angles. Training or devices may enhance worker performance for safer ladder setup.

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Area of Science:

  • Occupational safety and ergonomics research.
  • Analysis of biomechanics and human factors in construction and maintenance tasks.

Background:

  • Extension ladder falls, often caused by slide-out events, are frequently linked to incorrect ladder inclination.
  • Improved ladder setup procedures are crucial for enhancing stability and reducing fall-related injuries.

Purpose of the Study:

  • To identify factors influencing the angular positioning of extension ladders.
  • To evaluate the efficacy of two anthropometric methods for setting extension ladder angles.

Main Methods:

  • Twenty experienced and 20 inexperienced participants performed ladder positioning tasks in a lab.
  • Tests utilized 4.88m and 7.32m extension ladders under no-instruction, ANSI A14, and "fireman" method conditions.
  • Ladder angle and setup time were recorded as performance measures.

Main Results:

  • Ladder setup method and effective ladder length significantly impacted positioning angle.
  • Anthropometric methods improved positioning but increased setup time by 50% and had a 9.5% failure rate for optimal angles.
  • Shorter ladders were consistently set at shallower angles.

Conclusions:

  • Anthropometric methods can enhance ladder safety if performed correctly, though user performance often falls short of theoretical estimates.
  • Additional training or assistive devices may be necessary to ensure accurate and safe ladder setup.
  • Findings offer practical guidance for employers and workers on correct extension ladder positioning.