Walking and other simple body movements may promote fluid circulation in the brain and potentially help it eliminate metabolic waste, according to a study published in the journal *Nature Neuroscience*.
A team of scientists studied brain movement in awake mice using high-speed two-photon microscopy. The researchers found that during movement, the brain shifts slightly within the skull, and this process is closely linked not to breathing or heart rate, but to the contraction of abdominal muscles during movement.
According to the study’s authors, the contraction of abdominal muscles creates mechanical pressure that is transmitted to the brain via vascular connections between the abdomen, spine, and central nervous system. The scientists describe this mechanism as a kind of “hydraulic” connection: body movement and muscle tension can trigger micro-movements of the brain and influence the movement of cerebrospinal and interstitial fluid.
Simulations have shown that such gentle brain movement may facilitate the removal of cerebrospinal fluid from brain tissue into the subarachnoid space. The authors emphasize that the direction of this flow differs from that observed during sleep, when the so-called glymphatic system—associated with clearing the brain of metabolic waste—is more active.
The popular science publication ScienceDaily, citing this study, notes that the contraction of abdominal muscles during movement may aid the circulation of cerebrospinal fluid, meaning that simple physical activity could potentially be linked to maintaining brain health. One of the study’s authors, Patrick Drew, explained that body movement may be an important physiological mechanism that affects the brain through a mechanical connection with the abdominal cavity.
However, the study does not prove that walking directly “cleanses” the human brain or treats neurological diseases. The study was conducted on mice, and conclusions regarding humans require further research. However, it demonstrates a possible biological mechanism through which routine physical activity may be beneficial not only for the heart, blood vessels, and muscles, but also for fluid exchange processes in the brain.
This is important for medicine and the wellness market because walking remains one of the most accessible ways to maintain health. Unlike complex workouts, it requires no equipment, special conditions, or high physical fitness. If future studies confirm a similar mechanism in humans, regular walking could gain another scientific rationale as a tool for preventing cognitive decline and maintaining normal brain function.
The study also notes that brain movement during walking has a very small amplitude—we are talking about microscopic displacements that cannot be felt. However, it is precisely these mechanical oscillations that may be sufficient to influence the movement of fluid in brain tissues.
The key conclusion of the study is that the brain is not completely isolated from the rest of the body, as was often previously thought. It is mechanically linked to the body’s movements, and contractions of the abdominal muscles during walking and other activities may be part of a system that helps move fluids within and around the brain.
