Related Experiment Video
Updated: Jan 8, 2026
10:57
Determining Soil-transmitted Helminth Infection Status and Physical Fitness of School-aged Children
Published on: August 22, 2012
24.2K
Public Health
Yanan Zhang1, Anwar T Merchant1, Jingkai Wei2
1University of South Carolina, Columbia, SC, USA.
Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 23, 2025
Summary
Engaging in recommended physical activity (PA) from midlife did not significantly reduce cognitive impairment in late life. Further research is needed to explore alternative long-term PA strategies for cognitive health.
Area of Science:
- Neuroscience
- Public Health
- Epidemiology
Background:
- Cognitive decline often begins in midlife, suggesting early intervention is crucial.
- Randomized controlled trials (RCTs) typically study PA in older adults, not midlife.
- Target trial emulation using observational data offers a method to study long-term midlife interventions.
Purpose of the Study:
- To emulate a target trial assessing the effectiveness of physical activity (PA) initiated in midlife for reducing cognitive impairment.
- To estimate the long-term impact of meeting PA guidelines from midlife through late life on cognitive function.
Main Methods:
- Analysis of Whitehall II study participants aged 45-64, free of cognitive impairment.
- Defined hypothetical PA intervention as ≥150 minutes/week of moderate-to-vigorous PA.
- Used parametric g-formula to estimate cognitive impairment risk, controlling for confounders and loss to follow-up over 18 years.
Main Results:
- Included 3,309 participants (26% female, all White).
- Cumulative risk of cognitive impairment increased over the 18-year follow-up period.
- Initiating hypothetical PA intervention from midlife did not significantly reduce cognitive impairment.
Conclusions:
- Maintaining recommended physical activity levels from midlife did not demonstrate significant cognitive benefits.
- Further research should investigate alternative strategies for effective long-term PA interventions starting in midlife to support cognitive health.
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