How Abdominal Muscles Move the Brain and Boost Waste Clearance
A new study from Penn State University reveals how movement in the body directly affects the brain. Published in Nature Neuroscience, the research shows that abdominal muscle contractions cause the brain to shift position. Scientists believe these findings also apply to human physiology and could explain how waste is cleared from brain tissue.
The team focused on how abdominal muscles influence brain movement. Using two-photon microscopy, they imaged the brains of 24 mice running on a treadmill. Electrodes recorded muscle contractions, which triggered rapid shifts in the brain’s position—both sideways and forward toward the nose.
Once the abdominal pressure eased, the brain returned to its original place. The researchers found that veins between the abdominal cavity, spinal cord, and brain act like a pump, transmitting pressure and driving fluid movement. Lead author Francesco Constanzo described the brain as having a sponge-like structure with a soft skeleton. This allows fluid to flow through it efficiently. Simulations showed that small, quick brain movements—caused by muscle contractions—push cerebrospinal fluid through the brain’s spongy tissue and into the subarachnoid space. The brain’s glymphatic system, a networked cleaning process, activates mainly at night. It helps remove waste products and may protect against neurodegenerative diseases.
The study highlights a direct link between bodily movement and brain function. Abdominal contractions appear to assist in fluid circulation, aiding the brain’s natural waste-clearing process. These results suggest that physical activity could play a key role in maintaining brain health.
