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Rolling Resistance: Problem Solving01:17

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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Problems of older persons using a wheeled walker.

Ulrich Lindemann1,2, Michael Schwenk3,4, Jochen Klenk3,4,5

  • 1Department of Geriatrics and Clinic for Geriatric Rehabilitation, Robert-Bosch-Hospital, Auerbachstr. 110, 70376, Stuttgart, Germany. ulrich.lindemann@rbk.de.

Aging Clinical and Experimental Research
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Summary

Intelligent wheeled walkers (WWs) aim to improve mobility for older adults. This study found WWs hinder door navigation but improve backward walking, highlighting areas for intelligent WW development.

Keywords:
DoorOlder personsUsabilityWheeled walker

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Area of Science:

  • Geriatric medicine
  • Rehabilitation engineering
  • Human-computer interaction

Background:

  • Wheeled walkers (WWs) are crucial for mobility and fall prevention in older adults.
  • Current WW usability issues limit user satisfaction.
  • Development of intelligent WWs seeks to enhance user experience and functionality.

Purpose of the Study:

  • To identify usability challenges associated with wheeled walkers (WWs).
  • To inform the design of intelligent WWs by understanding user difficulties.
  • To investigate WW performance in common daily tasks.

Main Methods:

  • A study involving 22 geriatric patients (median age 82 years) assessed WW use.
  • Participants navigated doorways against their walking direction, with and without WWs.
  • Interviews were conducted to identify other WW-related problems.

Main Results:

  • Navigating doorways was significantly slower with WWs (12.86s vs 8.71s without).
  • Door interference occurred in 93% of doorway navigation attempts.
  • Backward walking showed improved gait speed, step width, and walk ratio with WWs (p < 0.002).
  • Major reported issues included walking uphill (77%) and downhill (83%), and obstacle crossing (77%).

Conclusions:

  • Intelligent WW development must address challenges in door navigation, especially opening doors against the direction of walking.
  • Optimization of uphill and downhill walking assistance is crucial for intelligent WW design.
  • Enhancing obstacle crossing capabilities should be a priority for intelligent WWs.