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Related Experiment Videos

Factors affecting seat contour characteristics.

S Sprigle1, K C Chung, C E Brubaker

  • 1University of Virginia, Rehabilitation Engineering Center, Charlottesville 22903.

Journal of Rehabilitation Research and Development
|January 1, 1990
PubMed
Summary

Subject characteristics and foam stiffness significantly impact wheelchair cushion contours. Muscle tone is a key factor, especially with stiffer foams, influencing load transfer for better cushion design.

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Area of Science:

  • Biomechanics
  • Materials Science
  • Rehabilitation Engineering

Background:

  • Wheelchair cushions are crucial for pressure distribution and comfort.
  • Understanding load transfer between users and cushions is vital for preventing pressure injuries.
  • Existing cushion designs may not adequately account for individual user variability.

Purpose of the Study:

  • To investigate how subject characteristics and foam properties influence seat contours.
  • To elucidate the load transfer mechanisms between the buttocks and wheelchair cushions.
  • To inform the design of improved contoured foam wheelchair cushions.

Main Methods:

  • Recorded seat contours for 17 individuals (11 spinal cord injured, 6 able-bodied).
  • Measured contour characteristics: maximum depth, surface area, displaced volume.

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  • Assessed subject attributes: intertrochanteric distance, body weight, lower extremity muscle tone.
  • Utilized two foam types with different stiffness (45 and 55 pound indentation load deflection [ILD]).
  • Employed multiple regression analysis to determine predictor variables for contour characteristics.

    • Main Results:

    • All regression models showed significant predictive ability (Multiple R: 0.79–0.92).
    • Subject characteristics significantly predicted contour traits (p < 0.05).
    • Muscle tone emerged as the strongest predictor for all contour characteristics with stiffer (55 ILD) foam.
    • Foam stiffness and subject characteristics interact to influence seat contours.

    Conclusions:

    • Subject characteristics and foam properties are key determinants of seat contours.
    • Muscle tone plays a critical role in contour formation, particularly with stiffer foams.
    • These findings provide insights into load transfer variations for designing effective wheelchair cushions.