Strength training may improve some thinking skills, but it is not yet known to lower dementia risk. Current evidence does not prove that it prevents new dementia diagnoses, according to the World Health Organization's 2026 risk-reduction guideline.
Strength training makes muscles work against resistance. In progressive resistance training, that challenge increases over time. Studies provide encouraging cognitive results, but better test scores do not necessarily mean fewer people will develop dementia.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What have strength-training trials found?
- Why better test scores do not prove prevention
- Who does this evidence apply to?
- How should readers act on the evidence?
What have strength-training trials found?
A 2026 randomized trial studied 89 adults with subcortical vascular mild cognitive impairment, or MCI. MCI involves cognitive difficulties but is distinct from a dementia diagnosis. After 12 months, twice-weekly progressive resistance training produced a small improvement in global cognition compared with balance-and-tone exercise, according to the University of British Columbia research team. That advantage appeared among women but not men. The researchers also found no significant group differences on other prespecified secondary outcomes.
Those mixed results limit how broadly the main finding can be applied. In the SMART randomized trial, 100 adults with MCI completed high-intensity progressive resistance training two or three times weekly for six months. The University of Sydney-led team reported improvements in global cognition and executive function, with benefits maintained across 18 months. Another trial followed 155 community-dwelling women aged 65 to 75 for one year. Once- and twice-weekly resistance training improved selective attention and conflict-resolution performance by 12.6% and 10.9%, respectively. The balance-and-tone group declined by 0.5%.
Why better test scores do not prove prevention
Most resistance-training trials assess performance on cognitive tests. They do not follow enough participants through new dementia diagnoses to show that training changes dementia incidence—the number of new cases over time. A larger U.S. trial illustrates the difference.
It assigned 1,635 sedentary adults aged 70 to 89 to either health education or a program combining walking, resistance, flexibility, and balance training. After 24 months, dementia occurred in 3.8% of the exercise group and 3.9% of the comparison group, with no significant difference in combined MCI or dementia, as reported in JAMA. Because resistance training was only one part of that program, the trial cannot establish what strength work alone would do. It does show why improvements in selected thinking skills should not be presented as proof of dementia prevention.
Who does this evidence apply to?
The trials involved specific groups: adults with MCI, adults with vascular cognitive impairment, sedentary older adults, and women aged 65 to 75. Results from one group may not carry over to younger adults, people already living with dementia, or the wider population. Sex-specific findings add uncertainty. The 2026 vascular MCI trial detected its cognitive advantage in women but not men, while the earlier trial of 155 adults included only women.
These results do not establish that strength training benefits one sex and not another. Observational evidence also requires caution. In the Cooper Center Longitudinal Study of 7,755 mostly White male adults, greater lower-body strength initially predicted lower dementia risk. Neither lower- nor upper-body strength remained associated with dementia after researchers adjusted for cardiovascular fitness. This suggests fitness or other differences may explain an apparent relationship between strength and dementia risk.
How should readers act on the evidence?
Strength work can reasonably form part of an active lifestyle for its established health benefits. Any protection against dementia should be treated as plausible but unconfirmed, not as a guarantee or a substitute for broader risk reduction. When deciding what to do: The WHO dementia fact sheet places physical activity within a broader approach that includes managing vascular risks, eating a healthy diet, avoiding smoking, and staying socially and cognitively active.
- Do not interpret improved memory or test performance as proof that dementia has been prevented.
- Note that the cited trials used schedules ranging from once weekly to two or three times weekly; they did not establish a dementia-prevention dose.
- Do not copy a high-intensity research program without considering present ability, health conditions, and appropriate guidance.
- If MCI or vascular cognitive impairment is already present, ask the care team how resistance work could fit into the existing care plan.
