Functional language networks in sedentary and physically active older adults.

Area of Science:

• Neuroscience
• Cognitive Aging
• Language Processing

Background:

• Aging is associated with altered brain activity patterns during cognitive tasks.
• The impact of physical exercise on age-related changes in language networks is not well understood.
• Mechanisms underlying age-related neural recruitment changes require further investigation.

Purpose of the Study:

• To investigate the neural correlates of language function in sedentary versus physically active older adults compared to young adults.
• To explore the relationship between physical activity, brain activity, and interhemispheric inhibition during semantic fluency.
• To identify how aging affects neural recruitment for language and if exercise can modify these effects.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity during a semantic fluency task.
• Transcranial magnetic stimulation (TMS) was employed to assess interhemispheric inhibition via the ipsilateral silent period.
• Participants included sedentary older adults, physically active older adults, and young adults.

Main Results:

• Sedentary older adults showed reduced negative task-related activity in attention network areas compared to active older adults.
• Increased interhemispheric inhibition correlated with greater negative task-related activity in the posterior perisylvian cortex.
• Findings suggest sedentary aging may lead to diminished cortical inhibition, potentially impacting language processing.

Conclusions:

• Physical exercise may counteract age-related decreases in cortical inhibition and preserve neural function during language tasks.
• Sedentary aging appears to be associated with reduced inhibitory processes in the brain.
• Regular physical activity could be a strategy to mitigate cognitive aging effects on language networks.