Exercise in middle age and old age reduces the risk of dementia by up to 45%, study finds

People who maintain high levels of physical activity in middle age and old age have a significantly lower risk of developing dementia. A study published in JAMA Network Open followed thousands of participants and found a reduction of up to 45% in the incidence of the disease among the most active people after age 65. The benefits were even greater in carriers of the APOE ε4 gene, the main genetic risk factor for Alzheimer.

The researchers analyzed data from more than 4,000 adults divided into three age groups. The most significant protection occurred exactly in phases in which vascular risk naturally increases.

Benefits appear even when starting late

Intense physical activity in middle age (45 to 64 years) was associated with a 41% lower risk of dementia. In old age (65 to 88 years old), the rate reached 45%.

The results indicate that exercise maintains a protective effect regardless of the age of onset. Mesmo individuals who were sedentary in their youth made significant gains by increasing their practice later on.

Greater impact on people with genetic risk

People with the APOE ε4 variant had a 66% reduction in risk when they maintained high physical activity in old age. The gene substantially increases the chances of Alzheimer, but exercise appears to counteract part of this factor.

Understand the case: Exercising in middle age reduces the risk of cognitive decline, says research

The researchers highlight that the benefit occurs even without intense practice in youth. Protection is especially evident when exercise coincides with the emergence of vascular risk factors.

Types of activities that make a difference

• Walking 3,800 steps a day reduces risk by 25%, according to 2012 study
• Using a bicycle as daily transport reduces the overall risk of dementia by 19%
• Moderate to vigorous activities follow WHO guidelines of 150 to 300 minutes per week

The data shows that greater volume brings additional protection. Substituir car for walking or cycling has a measurable impact on brain health.

Practical recommendations from WHO and experts

Organização Mundial of Saúde maintains the guideline of 150 minutes of moderate aerobic activity per week or 75 minutes of vigorous intensity. Treinos of strength twice a week complement the benefits.

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Experts advise starting with short, low-intensity sessions. Caminhadas 20 minutes a day or active breaks at work help create a sustainable routine.

Why middle age and old age are critical periods

Vascular risk factors such as hypertension, diabetes and high cholesterol appear mainly after the age of 45. Exercise directly affects the health of the blood vessels that supply the brain.

Regular practice improves cerebral blood flow and reduces inflammation. Esses mechanisms explain why the protective impact intensifies precisely in these age groups.

Limitations pointed out by the researchers themselves

The study used self-reported questionnaires, which may lead to inaccuracies. Não it was possible to accurately measure the ideal amount of exercise.

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More active participants also tend to adopt other healthy habits. Essa characteristic makes it difficult to completely isolate the unique effect of physical activity.

Experts reinforce that the findings are in line with dozens of previous studies. The body of evidence makes the recommendation to maintain or start regular practice at any adult age consistent.

How to get started without risks

Professionals advise gradually increasing the intensity and duration of sessions. Iniciantes should prioritize low-impact activities such as walking, swimming or light cycling.

Consulting a doctor before significant changes remains essential. The assessment identifies possible cardiac or orthopedic restrictions that require specific adaptations.