A new study from Brazil suggests that weight training can help protect the brain from dementia, especially in older adults already at risk.
Researchers at the State University of Campinas (UNICAMP) found that regular strength training not only improved memory but also helped prevent brain shrinkage linked to Alzheimer’s disease.
The study, published in GeroScience, involved 44 older adults with mild cognitive impairment (MCI)—a condition where memory and thinking skills are starting to decline but not yet at the level of full dementia.
People with MCI have a higher risk of developing Alzheimer’s disease.
Half of the participants did weight training twice a week for six months, using moderate to heavy weights with increasing difficulty. The other half didn’t exercise and served as a control group.
At the end of the study, those who did weight training showed better performance in memory tests and had healthier brain structures.
Brain scans revealed that two important areas—the hippocampus and precuneus, both linked to Alzheimer’s—were protected from shrinking. They also had better white matter integrity, which reflects the health of nerve connections in the brain.
“The physical benefits were expected,” said Isadora Ribeiro, the lead author. “But the brain improvements, especially in people already at risk, show just how powerful weight training can be.”
Some participants improved so much that five of them no longer met the criteria for mild cognitive impairment by the end of the study.
According to the researchers, strength training protects the brain in several ways. It may increase levels of brain growth proteins, reduce inflammation, and stimulate the production of anti-inflammatory immune cells. All of these factors can help protect brain cells and delay or even reverse damage.
“Inflammation plays a big role in brain aging,” explained Marcio Balthazar, co-author of the study. “By reducing inflammation, we can slow down the processes that lead to dementia.”
The researchers also measured levels of substances like BDNF and irisin, which are linked to brain health and are produced during muscle activity. These results are still being analyzed and will help explain how weight training affects the brain.
Weight training, they argue, is a low-cost, non-drug way to protect brain health, and it may be especially helpful for people who already show signs of cognitive decline.
“It’s something anyone can do at a local gym or with basic equipment,” said Ribeiro. “And it might make a big difference in how we age.”