Outdoor exercises, such as running, tennis, or soccer, help counteract some brain aging factors associated with an increased risk of dementia. However, a new study conducted at the University of Arizona found that engaging in sports activities in polluted areas significantly diminishes the benefits of these exercises on the brain.
Researchers examined over 8,600 Britons whose physical activity was tracked using a wrist-worn fitness device for a week. It was found that those who were more active had lower levels of white matter lesions and damage to the inner layer of the brain that connects its various regions. However, these results indicated individuals living in low-pollution areas.
According to the researchers, small pollution particles can cause inflammation in the body or damage blood vessels, which may affect the brain. Dr. Melissa Forlong, who led the study at the University of Arizona, stated, "Intense exercise may increase exposure to air pollution, and previous studies have shown the negative effects of air pollution on the brain."
The study, published in the journal Neurology, involved individuals aged 40 to 69 who engaged in outdoor sports while considering the pollution levels in their living environment. They were then compared to those who did not engage in any vigorous physical activity at all.
MRI scans showed that the most active individuals in low-pollution areas were less likely to have white matter lesions, which are more common in the elderly and increase the risk of strokes or dementia. Researchers recommended jogging or cycling in roads and areas away from traffic that are usually less prone to pollution, as reported by the Daily Mail.
