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Cognitive function modifies the effect of physiological function on the risk of multiple falls--a population-based

Kara L Martin1, Leigh Blizzard, Velandai K Srikanth

  • 1Menzies Research Institute, University of Tasmania, Hobart, Australia.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|February 16, 2013
PubMed
Summary

Older adults with poor cognitive function face a higher risk of multiple falls, especially when combined with physiological impairments. Interventions must consider cognitive status to effectively prevent falls in this population.

Keywords:
Accidental fallsCognitionElderlyPopulation based.Risk factorsSensorimotor

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Area of Science:

  • Gerontology
  • Neuroscience
  • Biomechanics

Background:

  • Falls are a significant concern for older adults, with limited understanding of how cognitive and physiological factors interact.
  • Poorer physiological function may exacerbate the risk of falls associated with cognitive decline in the elderly.

Purpose of the Study:

  • To investigate the interplay between cognitive function, physiological function, and the risk of falls in older adults.
  • To determine if physiological impairments modify the association between cognitive function and fall risk.

Main Methods:

  • 386 adults aged 60-86 underwent assessments of cognitive (executive function, memory, processing speed, visuospatial ability) and physiological functions (vision, proprioception, sway, leg strength, reaction time).
  • Incident falls were tracked over 12 months.
  • Log-multinomial regression analyzed relationships and interactions between cognitive and physiological measures for single and multiple falls.

Main Results:

  • No significant link was found between cognitive function and single fall risk.
  • Increased risk of multiple falls was associated with poorer performance in Stroop tests (dot time, word time).
  • Better Category Fluency and visuospatial function reduced multiple fall risk. These effects were amplified by greater body sway, reduced physical activity, slower reaction/gait speed, weaker muscle strength, and poorer vision (p < .05 for interactions).

Conclusions:

  • Cognitive impairment plays a key role in older adults' inability to compensate for physical decline, increasing fall risk.
  • Fall prevention strategies for community-dwelling older adults with physiological impairments should be tailored based on their cognitive status.