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Functional decline in cognitive impairment--the relationship between physical and cognitive function.

Tung Wai Auyeung1, Timothy Kwok, Jenny Lee

  • 1Jockey Club Center for Osteoporosis Care and Control, Hong Kong, SAR, China. auyeungtw@gmail.com

Neuroepidemiology
|September 12, 2008
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Summary

Cognitive impairment is linked to poorer physical function and muscle strength in older adults, independent of muscle mass. This suggests cognitive decline directly impacts physical abilities, not just through sarcopenia.

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Area of Science:

  • Gerontology
  • Neurology
  • Physical Therapy

Background:

  • Physical function decline in the elderly is associated with dementia.
  • This decline may be due to sarcopenia (age-related muscle loss) or directly from cognitive impairment.
  • Understanding this relationship is crucial for targeted interventions in aging populations.

Purpose of the Study:

  • To investigate the relationship between cognitive function and performance-based physical function in Chinese elderly.
  • To determine if cognitive function predicts poor physical function independently of muscle mass.
  • To test the hypothesis that cognitive impairment directly impacts physical performance.

Main Methods:

  • A cross-sectional study of 4,000 community-dwelling Chinese elderly (aged >65 years).
  • Assessment of muscle strength, physical function (grip strength, walk speed, chair stand), and muscle mass (dual-energy X-ray absorptiometry).
  • Cognitive function assessed using the Community Screening Instrument for Dementia (CSI-D); cognitive impairment defined as a score >28.40.
  • Multivariate analysis adjusted for age, appendicular skeletal mass (ASM), Physical Activity Scale for the Elderly (PASE), and comorbidities.

Main Results:

  • Cognitively impaired individuals showed significantly weaker grip strength and poorer performance in physical function tests compared to the non-impaired group, in both men and women.
  • These differences persisted even after adjusting for age, muscle mass (ASM), physical activity (PASE), and other comorbidities.
  • Adjusted results showed significant differences in grip strength, 6-meter walk speed, and chair stand test performance between cognitively impaired and non-impaired groups.

Conclusions:

  • Poor physical function and reduced muscle strength are associated with cognitive impairment in older adults.
  • This association is independent of muscle mass, suggesting sarcopenia is not the sole mediator.
  • Functional decline in dementia may be directly caused by factors related to cognitive impairment itself, separate from muscle loss.