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Chair rise strategy in the functionally impaired elderly

M A Hughes1, M L Schenkman

  • 1Center on Aging, University of Kansas Medical Center, Kansas City 66160, USA.

Journal of Rehabilitation Research and Development
|October 1, 1996
PubMed
Summary

Functionally impaired elderly adopt a more conservative chair rise strategy with increased difficulty. They increase momentum and stability, but this leads to reduced success in rising from a chair.

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Area of Science:

  • Gerontology
  • Biomechanics
  • Human Movement Science

Background:

  • Rising from a chair is a common functional activity that elderly individuals often find challenging.
  • Previous research has identified various chair rise strategies for different age and functional groups.
  • Modifications in strategies for younger and healthier elderly with varying chair heights have been studied.

Purpose of the Study:

  • To examine how chair rise strategies change in moderately functionally impaired elderly as task difficulty increases.
  • To investigate the specific kinematic and spatial adjustments made during chair rising with greater difficulty.

Main Methods:

  • The study involved 18 moderately functionally impaired elderly participants.
  • Participants were assessed while rising from their lowest successful chair height compared to a knee-height chair.

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  • Key parameters measured included peak hip flexion velocity, time to rise, and center of mass/base of support (COM/BOS) separation at lift-off.

    • Main Results:

    • With increased difficulty (lower chair), participants significantly increased peak hip flexion velocity (11 degrees/sec) and time to rise (1.25 sec).
    • Simultaneously, they significantly decreased their mean COM/BOS separation at lift-off (1.96 cm).
    • These changes indicate an attempt to increase momentum and stability.

    Conclusions:

    • Functionally impaired elderly exhibit altered chair rise strategies under increased difficulty, suggesting a more conservative approach.
    • While attempting to enhance momentum and stability, these adjustments paradoxically lead to decreased success in rising.
    • Understanding these compensatory strategies is crucial for developing interventions to improve functional independence in the elderly.