Stand up, walk, sit down. Slower times went with smaller brains.
People say: “Can a simple chair test hint at brain health?” We read the study.
Cross-sectional study. 2,178 people. one snapshot in time (baseline visits 2018-2023); no follow-up.
One snapshot in time. Nobody was told what to do. A clue, not proof.
Who: Cognitively normal adults in the US Healthy Aging Brain Study-Health Disparities cohort: 920 non-Hispanic white, 424 non-Hispanic Black, 834 Hispanic; mean age 64.7 (SD 8.4), 66.2% women; people with MCI or dementia excluded
- Whole-brain volumesmallerslower walk test
- Memory center sizesmallerhippocampus
- White-matter spotsmorelinked, not proven
More to know, from our read of the paper:
- Cross-sectional (one point in time): cannot tell whether a smaller brain slows people down or the reverse; authors call for longitudinal studies
- Observational: linked, not proven. No physical activity data and no height/weight/BMI in the models; comorbidities self-reported yes/no
- Hippocampus link with the SPPB balance/strength battery was not significant after Bonferroni (adj. p = 0.14); only the timed walk test (TUG) held for the hippocampus
- Race/ethnicity differences: interaction terms not significant after Bonferroni; white-matter links weaker in non-Hispanic Black participants. Don't claim group differences
Slower walking test, smaller brain. Linked, not proven.
About 2,200 US adults (average age 65) with no memory problems did a timed test: stand up from a chair, walk 3 meters, turn, walk back and sit down. They also had an MRI brain scan. Slower times went with a smaller brain overall, a smaller hippocampus (a memory center) and more white-matter spots, after adjusting for age, sex, education, blood pressure, cholesterol and diabetes. It was one snapshot in time, so it can't show which came first: linked, not proven.
Knell G, Meeker KL, Zhou Z, Petersen ME, Hall JR, O'Bryant SE (2026). Evaluation of physical functioning as a marker of brain imaging outcomes in a multiethnic community-based cohort. Journal of Alzheimer's Disease.
Design: Cross-sectional study · cross-sectional analysis of a community-based cohort (HABS-HD); multivariable linear regression with Bonferroni correction, plus exploratory logistic models (linked, not proven)
DOI: 10.1177/13872877261449514
Goals:
We read the abstract and the full text of this paper and checked every number on this page against it (18 facts, checked on 2026-10-29). The study design is named above. Cohort and other observational studies are described as linked, not proven. Found an error? Email theis@onestudyaday.com.
Join the waitlist: one checked study a day for your goal, by email
Pick up to three goals. We email you once when the daily study starts. The goals for this study are ticked already.