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Public Health.

Claire J Cadwallader1, Anna M VandeBunte1, Rowan Saloner1

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Summary
This summary is machine-generated.

Structured physical activity (PA) sessions, particularly their frequency, significantly reduce white matter hyperintensity (WMH) burden in older adults. This highlights the importance of regular, purposeful exercise for brain aging and cerebrovascular health.

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Area of Science:

  • Gerontology
  • Neuroscience
  • Public Health

Background:

  • Higher physical activity (PA) is linked to better cognition and brain health in older adults.
  • Optimal parameters for structured PA sessions (intensity, duration, frequency) are not well-defined.
  • Understanding these parameters is crucial for promoting brain health in aging populations.

Purpose of the Study:

  • To compare cognitive, brain volume, and plasma biomarker outcomes between older adults who engaged in structured PA sessions (exercisers) and those who did not (non-exercisers).
  • To examine the relative importance of in-session versus out-of-session activity on these outcomes.
  • To determine the influence of specific PA session parameters on outcomes in exercisers.

Main Methods:

  • 329 older adults underwent 30 days of actigraphy monitoring, biomarker assays, MRI, and neuropsychological testing.
  • PA sessions were defined as ≥10 minutes with >40 steps/min.
  • Statistical analyses (ANCOVA, Random Forest) compared groups and identified key predictors of brain health outcomes.

Main Results:

  • Exercisers exhibited significantly lower white matter hyperintensity (WMH) burden compared to non-exercisers.
  • In-session activity, specifically steps, was a stronger predictor of WMH burden than out-of-session activity.
  • Among exercisers, session frequency, duration, and cadence were key predictors of reduced WMH burden.

Conclusions:

  • Structured PA sessions are crucial for mitigating WMH burden, a marker of brain aging and cerebrovascular health.
  • The frequency of PA sessions appears to be the most critical parameter for optimizing brain health benefits.
  • Further research can refine PA recommendations for enhanced brain health interventions.