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Related Experiment Videos

Lifting characteristics of functionally limited elders.

M S Puniello1, C A McGibbon, D E Krebs

  • 1MGH Institute of Health Professions, Massachusetts General Hospital Biomotion Laboratory, Boston 02114-4719, USA.

Journal of Rehabilitation Research and Development
|August 5, 2000
PubMed
Summary

Elderly individuals with functional limitations use different lifting strategies based on strength. Stronger elders exhibit more momentum and jerk, while weaker ones adopt a more stable approach.

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Area of Science:

  • Biomechanics
  • Gerontology
  • Kinesiology

Background:

  • Functional limitations in elders impact daily activities like lifting.
  • Assessing biomechanical lifting characteristics is crucial for understanding elder mobility.

Purpose of the Study:

  • Investigate lifting characteristics in elders with functional limitations.
  • Correlate lifting smoothness, trunk angular momentum, and torques with strength and functional measures.

Main Methods:

  • Biomechanical analysis of lifting, gait, and chair rise in 30 elders (65-89 years).
  • Measured peak vertical jerk (smoothness) and head, arms, trunk (HAT) angular momentum.
  • Assessed maximum isometric strength of hip/knee extensors and shoulder flexors.

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Main Results:

  • Hip extensor strength positively correlated with box jerk and trunk angular momentum.
  • Peak upper body angular momentum during lifting inversely correlated with normalized gait speed.
  • Trunk angular momentum during lifting positively correlated with that during chair rise.

Conclusions:

  • Stronger elders utilize greater peak vertical box jerk and trunk angular momentum for lifting.
  • Weaker elders adopt a more conservative, stable lifting strategy with less momentum and jerk.
  • Clinicians should assess strength and function before advising on lifting mechanics for elders.