Brain HealthRegular Exercise Boosts the Brain's Waste-Clearance System to Fight Cognitive Decline
Researchers at Victoria University reviewed evidence linking regular physical activity to improved function of the glymphatic system, the brain's primary waste-clearance pathway. This system, most active during deep sleep, removes harmful proteins and metabolic byproducts that accumulate with age and are linked to dementia and Alzheimer's disease. The analysis found that exercise supports glymphatic function through multiple connected pathways: reducing blood pressure and vascular stiffness, lowering brain inflammation, decreasing resting norepinephrine, and improving sleep quality — particularly slow-wave deep sleep. As glymphatic efficiency naturally declines with age, the findings suggest regular movement could be a practical, non-pharmacological strategy to protect the aging brain. Key questions remain about optimal exercise type, dose, and whether benefits extend to those already experiencing cognitive decline.
