Movement as a Brain-Flush Mechanism, New Study Finds

Penn State researchers report in Nature Neuroscience that contractions of the abdominal muscles can push blood into the spinal canal, prompting brain movement and driving cerebrospinal fluid through drainage pathways to help clear waste; through two-photon imaging in living mice, micro-CT scans, and computational modeling, they mapped a vein network linking the abdomen, spine, and brain and observed brain motion immediately after abdominal tightening, with the motion reversing when pressure is released. The work suggests everyday movement may aid brain health by boosting waste clearance, offering a potential explanation for why movement and sleep affect CSF flow differently.