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Summary
This summary is machine-generated.

Physical activity does not appear to affect grey matter volume in the hippocampus or dorsolateral prefrontal cortex (dlPFC), and sex does not moderate this relationship. Self-report measures may lack sensitivity for brain-behavior studies.

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Area of Science:

  • Neuroscience
  • Human Brain Anatomy
  • Exercise Physiology

Background:

  • Previous research suggests a link between physical activity and brain grey matter volume.
  • The influence of sex on this association remains unclear and debated.

Purpose of the Study:

  • To investigate if physical activity is associated with grey matter volumes in the hippocampus and dorsolateral prefrontal cortex (dlPFC).
  • To determine if sex moderates the relationship between physical activity and these brain regions.

Main Methods:

  • Examined data from 1,809 participants across five European cohorts (Lifebrain consortium).
  • Utilized linear models and random-effects meta-analysis to assess associations and sex interactions.
  • Focused on self-reported physical activity and regional grey matter volumes.

Main Results:

  • Found no significant relationship between physical activity and hippocampal or dlPFC volumes.
  • No evidence of sex as a moderator in the association between physical activity and grey matter volumes.

Conclusions:

  • Null findings suggest self-report physical activity questionnaires may not be sensitive enough for detecting modest brain-behavior associations.
  • Reliance on self-report data is suboptimal for nuanced brain-behavior analyses.
  • Further research may require more objective measures of physical activity.