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The relationship between objective physical activity and change in cognitive function.

Kelsey R Sewell1, Stephanie R Rainey-Smith1,2,3,4, Jeremiah Peiffer1

  • 1Centre for Healthy Ageing, Health Futures Institute, Murdoch University, Murdoch, Western Australia, Australia.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|January 19, 2023
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Summary
This summary is machine-generated.

Regular physical activity, especially higher intensity, is linked to better memory and cognitive function in older adults. Maintaining activity levels can help preserve brain health over time.

Keywords:
Alzheimer's diseaseagingepisodic memoryglobal cognitionlongitudinalphysical activity

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Area of Science:

  • Neuroscience
  • Gerontology
  • Exercise Physiology

Background:

  • Cognitive decline is a significant concern in aging populations.
  • The relationship between physical activity and cognitive function in older adults requires further investigation.
  • Objective measures of physical activity provide a more accurate assessment than self-report.

Purpose of the Study:

  • To investigate the longitudinal association between objectively measured physical activity and cognitive function in older adults.
  • To determine if physical activity intensity, total activity, or energy expenditure predict cognitive changes over time.

Main Methods:

  • Utilized data from 199 cognitively unimpaired older adults (≥60 years) from the Australian Imaging, Biomarkers and Lifestyle (AIBL) study.
  • Measured physical activity using actigraphy at baseline, assessing intensity, total activity, and energy expenditure.
  • Assessed cognitive function using a comprehensive battery every 18 months over approximately 8 years.

Main Results:

  • Higher baseline energy expenditure predicted better episodic recall memory and global cognition.
  • Increased physical activity intensity and greater total activity were associated with improved global cognition over time.
  • Higher total physical activity predicted enhanced episodic recall memory longitudinally.

Conclusions:

  • Objectively measured physical activity, particularly intensity and energy expenditure, is associated with preserved cognitive function in older adults.
  • These findings highlight the potential of physical activity interventions to maintain cognitive health in aging populations.
  • Activity intensity appears to be a crucial factor in the physical activity-cognition relationship.