{"id":184,"date":"2025-06-04T06:23:07","date_gmt":"2025-06-04T13:23:07","guid":{"rendered":"https:\/\/scienceblog.com\/sciencechina\/?p=184"},"modified":"2025-06-04T06:23:32","modified_gmt":"2025-06-04T13:23:32","slug":"too-much-exercise-ages-your-brain-faster-study-reveals","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/sciencechina\/2025\/06\/04\/too-much-exercise-ages-your-brain-faster-study-reveals\/","title":{"rendered":"Too Much Exercise Ages Your Brain Faster, Study Reveals"},"content":{"rendered":"

Exercise is good for your brain\u2014but only up to a point. A new study tracking nearly 17,000 people using wrist-worn activity monitors has uncovered a surprising truth: both too little and too much physical activity can accelerate brain aging. The research, published in Health Data Science<\/a>, challenges the common belief that more exercise is always better for cognitive health.<\/p>\n

Using advanced machine learning to analyze brain scans, researchers found that moderate amounts of exercise appeared to slow brain aging regardless of intensity level. However, people who exercised excessively showed signs of accelerated brain aging similar to those who barely moved at all.<\/p>\n

The Sweet Spot for Brain Health<\/h2>\n

The study followed participants for seven days using precise accelerometers that measured light, moderate, and vigorous physical activity. Researchers then used artificial intelligence to predict each person’s “brain age” from MRI scans and compared it to their actual chronological age.<\/p>\n

What they discovered was a U-shaped curve: brain aging accelerated at both extremes of the physical activity spectrum. People in the middle ranges of exercise showed the youngest brain ages relative to their chronological age.<\/p>\n

“Our study not only confirms a nonlinear relationship between objectively measured PA and brain aging in a large population, but also provides actionable insight: more exercise isn’t always better\u2014moderation is key,” said Associate Professor Chenjie Xu from Hangzhou Normal University, who led the research.<\/p>\n

How Exercise Changes Your Brain<\/h2>\n

The brain aging effect wasn’t just statistical\u2014it had real consequences. The study found that brain age partially mediated the relationship between exercise and cognitive performance. People with older-appearing brains showed slower reaction times and were more likely to develop dementia and depression.<\/p>\n

When researchers examined specific brain regions, they found that moderate exercise was associated with several protective changes:<\/p>\n