Brain network changes linked to thinking gains in older adults
In a six-month randomized exercise trial of 107 adults aged 55–80, links between brain network changes and thinking gains varied with age.
107 participants, non-randomized trial
Limit: Education, medication use, and socioeconomic status were omitted from models despite influencing thinking skills
Edited by Boris Djordjevic · AgingResearch.News
A randomized trial analyzed thinking tests from 107 relatively inactive adults aged 55 to 80 without dementia. Participants attended supervised exercise three times weekly for 24 weeks. The higher-intensity group did walking or cycling, gradually building toward 40 minutes of moderate-to-vigorous activity. The comparison group did light exercise, flexibility and mobility work. Brain scans in 98 participants measured connectivity—how closely activity in regions within a brain network fluctuated together.
In the moderate-to-vigorous group, increased connectivity in three networks was associated with gains on tests of thinking skills and processing speed, most clearly from the mid-60s to mid-70s. Higher-intensity exercise also improved one processing-speed test compared with light exercise at ages 58 to 65. Changes on the other two thinking tests did not differ between groups.
Why it matters
The authors suggested that programs supporting brain and cognitive health in older adulthood should target moderate-to-vigorous exercise intensity, particularly for people in their mid-60s to mid-70s.
Caveats
The age-specific analyses were exploratory and included only participants with before-and-after assessments; the brain–cognition associations do not establish causation. Participants were relatively inactive adults without dementia or neurological disease, and the supplied text does not report adverse events.
From the paper
- Participants
Overall, 107 participants completed the main cognitive assessments, specifically EF and PS tasks, during both the pre- and post-exercise intervention phases.
- Who took part
The present study utilized a randomized controlled trial (RCT) to administer exercise intensity doses to non-demented, relatively inactive older adults.
- Ages
We recruited non-demented older adults, aged 55 to 80 years, at the time of enrollment.
- Duration
Participants then completed cognitive assessments and MRI scans both before and after 6-month aerobic exercise training.
- Result
The largest difference occurred at age 61, where older adults in the ModVig group had a mean delta score of 0.58 (95% CI = 0.02, 1.14), compared to a mean delta score of −1.35 (95% CI = −1.93, −0.77) in the Light group.
- Limitation
This study used a novel TVEM approach to compare the effects of light- versus moderate-to-vigorous intensity aerobic exercise on age-specific changes in brain network FC and cognition.
- Executive function
This association was observed only in the ModVig group among individuals aged 58 to 64 based on CIs that did not include zero ( b and Supplemental Table 4.1.a), with the strongest magnitude observed at age 62 (β = 0.09; 95% CI = 0.01, 0.18).
Quoted word for word from the full text on PubMed Central.
The paper
University of North Texas; University of Iowa
Aging Brain, Jul 28, 2026, Open access
