Physical Activity Is Positively Associated with Episodic Memory in Aging.

Area of Science:

• Gerontology
• Neuroscience
• Cognitive Psychology

Background:

• Aging commonly leads to declines in executive function and episodic memory.
• Individual cognitive variability exists among older adults, with physical activity potentially playing a role.
• Objective assessment of physical activity's differential impact on cognition in aging is underexplored.

Purpose of the Study:

• To objectively assess physical activity in young and older adults.
• To examine the association between physical activity and cognitive performance (executive function, episodic memory) in aging.
• To determine if physical activity is differentially associated with cognition in younger versus older adults.

Main Methods:

• Young (n=29, 18-31 years) and older adults (n=31, 55-82 years) underwent neuropsychological testing.
• Episodic memory was further assessed using a face-name relational memory task.
• Physical activity (total steps, step rate) was objectively measured using accelerometers; hierarchical regressions analyzed relationships.

Main Results:

• Older adults exhibited poorer performance in executive function and episodic memory compared to younger adults.
• Physical activity positively correlated with visual episodic memory and face-name memory accuracy in older adults.
• These associations were independent of sedentary behavior; no significant associations were found in younger adults.

Conclusions:

• Physical activity is positively associated with episodic memory performance in older adults.
• The strongest relationships were observed for face-name relational memory and visual episodic memory, potentially due to hippocampal demands.
• Physical activity appears to benefit cognition in older adults, but not in younger adults.