A new study suggests that a simple abdominal movement may help the brain clear metabolic waste, challenging the long-held view that this process happens mainly during sleep.
RESEARCHERS at the University of Copenhagen used high-speed imaging in awake mice to show that contractions of the abdominal muscles produce a gentle mechanical shift in the brain. This motion, they found, may drive interstitial fluid-and the waste it carries-out of brain tissue and into the subarachnoid space for disposal.
Brain motion was primarily directed forward and sideways, and was tightly linked to locomotion. Notably, the motion began before the limbs moved, pointing to abdominal muscle activation as the trigger. Applying pressure directly to the abdomen produced a similar effect, supporting a hydraulic mechanism involving the vertebral venous plexus.
Computer simulations suggested that this movement could drive fluid flow in the brain, though in a direction opposite to that seen during sleep. The authors emphasize that these findings reposition the brain as mechanically linked to the abdomen, rather than an isolated organ.
If confirmed in humans, the work suggests that even light daytime movement-like gentle core engagement-may support neural waste clearance. The team notes further research is needed to determine whether reduced mobility contributes to impaired waste removal in neurodegenerative conditions such as Alzheimer’s disease.