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Related Experiment Videos

Moment generation in wheelchair propulsion.

Lan-Yuen Guo1, K D Zhao, Fong-Chin Su

  • 1Institute of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|October 16, 2003
PubMed
Summary

This study analyzed wheelchair propulsion mechanics, finding that hand position significantly impacts propulsion moment and force direction. Optimizing wheelchair fit and user training can enhance propulsion efficiency.

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Area of Science:

  • Biomechanics
  • Human-Machine Interaction
  • Rehabilitation Engineering

Background:

  • Wheelchair propulsion involves complex interactions between user and device.
  • Chair design and fit influence upper extremity positioning during propulsion.
  • Understanding these biomechanical relationships is crucial for improving wheelchair user mobility.

Purpose of the Study:

  • To investigate the effect of hand position on wheelchair propulsion biomechanics.
  • To develop a subject-specific model to predict optimal propulsion strategies.
  • To identify factors influencing propulsion efficiency for potential improvements.

Main Methods:

  • Experimental data collection from five subjects propelling an instrumented wheelchair in five hand positions.

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  • Subjects exerted maximal effort with the wheel in a locked position.
  • Development of a quasi-static upper extremity model to simulate propulsion.

    • Main Results:

    • Progression moment peaked at initial and terminal propulsion phases, lower in the mid-phase.
    • Hand forces were directed radially away from the axle posterior to the dead center and towards the axle anterior to it.
    • Model predictions aligned with experimental trends in moments and force direction.

    Conclusions:

    • Hand position and force direction are key determinants of wheelchair propulsion moment.
    • Individual anthropometry, joint strength, and force application influence optimal propulsion.
    • Personalized wheelchair fitting and user training may enhance propulsion technique and efficiency.