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Abdominal pressure can rapidly and significantly alter the position of the brain, driving essential fluid flow for waste removal. Credit: Neuroscience News<\/p>\nSummary: The brain is far more mechanically integrated with the rest of the body than scientists previously realized. In a study, researchers revealed a \u201chydraulic pump\u201d mechanism that links physical activity to brain health.<\/p>\n
When you contract your abdominal muscles, even during a light movement like taking a step, you compress blood vessels that push fluid into the spinal cavity. This pressure causes the brain to gently \u201csway\u201d within the skull, a motion that acts like squeezing a dirty sponge to flush out toxic neural waste via the cerebrospinal fluid (CSF).<\/p>\n
Key Facts<\/p>\n
The Abdominal Pump: Abdominal contractions compress the vertebral venous plexus, a network of veins linking the abdomen to the spine. This pushes blood upward, creating a hydraulic pulse that moves the brain.The \u201cDirty Sponge\u201d Analogy: Researchers modeled the brain as a sponge. To clean it, you must squeeze it; the mechanical swaying caused by movement helps \u201csqueeze\u201d fluid through brain tissue to clear metabolic waste.Pre-Movement Pulse: Using two-photon microscopy, scientists observed the brain shifting before a mouse actually moved its limbs, triggered by the core muscle tension required to initiate action.Exercise as a Detergent: This mechanism explains why even light exercise\u2014like walking or tensing your core, is vital for preventing neurodegenerative disorders associated with waste buildup, such as Alzheimer\u2019s.Instant Recovery: The brain\u2019s position resets immediately once abdominal pressure is released, showing that our brains are in a constant state of subtle, health-promoting motion throughout the day.<\/p>\n
Source: Penn State<\/p>\n
The brain is more mechanically connected to the body than previously appreciated, scientists\u00a0reported today (April 27) in\u00a0Nature Neuroscience.\u00a0<\/p>\n
Through\u00a0a study\u00a0using\u00a0mice and\u00a0simulations,\u00a0the team found\u00a0a potential biological mechanism underlying why\u00a0exercise is thought to\u00a0benefit brain health:\u00a0abdominal contractions\u00a0compress\u00a0blood vessels connected to\u00a0the spinal cord and\u00a0the brain, enabling\u00a0the organ\u00a0to gently move within the skull.<\/p>\n
Abdominal pressure can rapidly and significantly alter the position of the brain, driving essential fluid flow for waste removal. Credit: Neuroscience News<\/p>\n
This\u00a0swaying\u00a0facilitates\u00a0the surrounding cerebrospinal fluid to flow over the brain,\u00a0potentially\u00a0washing away\u00a0neural waste\u00a0that could cause problems for brain function.\u00a0\u00a0<\/p>\n
According to\u00a0Patrick Drew, professor of engineering\u00a0science and mechanics,\u00a0of neurosurgery, of biology and of biomedical engineering at Penn State, the work builds on\u00a0previous\u00a0studies\u00a0detailing how\u00a0sleep\u00a0and\u00a0neuron loss\u00a0can influence how and when cerebrospinal fluid flushes through the brain.\u00a0\u00a0<\/p>\n
\u201cOur research\u00a0explains\u00a0how just moving around might\u00a0serve\u00a0as\u00a0an important physiological mechanism\u00a0promoting brain health,\u201d said Drew,\u00a0corresponding\u00a0author on the paper.<\/p>\n
\u201cIn this study, we\u00a0found that when the abdominal muscles contract,\u00a0they push blood\u00a0from the abdomen\u00a0into\u00a0the spinal cord,\u00a0just like in a hydraulic system,\u00a0applying pressure to the brain and making it move. Simulations show that\u00a0this gentle brain movement\u00a0will drive\u00a0fluid flow\u00a0in and around the brain.\u00a0<\/p>\n
\u201cIt is\u00a0thought\u00a0the movement of fluid in the brain is important for removing\u00a0waste\u00a0and\u00a0preventing neurodegenerative disorders.\u00a0Our research shows that a little bit of motion is good, and it could be another\u00a0reason\u00a0why\u00a0exercise is good for our brain health.\u201d\u00a0\u00a0<\/p>\n
Drew, who also holds the title of associate director of the Huck\u00a0Institutes of the Life Sciences, explained how in a hydraulic system,\u00a0a pump creates pressure that drives fluid flow. In this case, the pump is the abdominal contraction\u00a0\u2014 which can be as light as the tensing prior to sitting up\u00a0or taking a step.\u00a0The contraction puts\u00a0pressure\u00a0on\u00a0the vertebral venous plexus,\u00a0a network of veins that connect the abdominal cavity to the spinal cavity,\u00a0causing the brain to\u00a0move.\u00a0\u00a0<\/p>\n
The researchers visualized the process in\u00a0moving\u00a0mice\u00a0with two advanced imaging\u00a0technologies:\u00a0two-photon microscopy\u00a0\u2014 which allows for high-definition imaging of living tissue \u2014\u00a0and\u00a0microcomputed tomography\u00a0\u2014\u00a0which\u00a0enables high-resolution 3D examination of whole organs.\u00a0<\/p>\n
They\u00a0observed\u00a0the brain shifting in the moments before the mouse moved,\u00a0but right after the tightening of the abdominal muscles needed to spur the body into\u00a0further movement.\u00a0\u00a0<\/p>\n
To confirm\u00a0that it was\u00a0abdominal contractions rather than other movement\u00a0that acted as the pump, the researchers applied gentle and controlled pressure to the abdomens of lightly anesthetized mice. With no other movement other than\u00a0a localized\u00a0mechanical pressure\u00a0less than\u00a0a human\u00a0would experience with\u00a0a\u00a0blood pressure cuff, the mice\u2019s brains\u00a0shifted.\u00a0\u00a0<\/p>\n
\u201cImportantly, the brain began moving back to its baseline position\u00a0immediately\u00a0upon relief\u00a0of\u00a0the abdominal pressure,\u201d Drew said. \u201cThis suggests that abdominal pressure can rapidly and significantly alter the position of the brain within the skull.\u201d\u00a0<\/p>\n
With the abdominal contraction-brain movement link confirmed, Drew said the next step was to understand\u00a0the\u00a0fluid\u2019s\u00a0movement in the\u00a0brain\u00a0and if the\u00a0brain\u2019s\u00a0movement\u00a0could induce fluid flow. However, there\u00a0previously were\u00a0no existing imaging techniques to visualize the rapid, nuanced dynamics of such fluid flows.\u00a0\u00a0<\/p>\n
\u201cLuckily,\u00a0our\u00a0interdisciplinary\u00a0team\u00a0at Penn State\u00a0was able to\u00a0develop these techniques, including\u00a0conducting\u00a0the imaging experiments of living mice and\u00a0creating\u00a0computer simulations of fluid motion,\u201d Drew said.<\/p>\n
\u201cThat combination of expertise is so important for understanding these types of complicated systems and how they impact health.\u201d\u00a0\u00a0<\/p>\n
Francesco Costanzo, professor of engineering science and mechanics, of biomedical engineering, of mechanical engineering and of mathematics, led the computational modeling.\u00a0<\/p>\n
\u201cModeling fluid flow in and around the brain offers unique challenges because there are simultaneous, independent movements,\u00a0as well as time-dependent, coupled movements.\u00a0Accounting for all of them\u00a0requires accounting for the special physics that happens every time a fluid particle crosses one of the many membranes in the brain,\u201d Costanzo said.<\/p>\n
\u201cSo, we simplified it. The brain has a structure\u00a0similar to\u00a0a sponge, in the sense that you have a soft skeleton and fluid can move through it.\u201d\u00a0\u00a0<\/p>\n
By simplifying the geometry of the brain to that of a sponge, Costanzo explained\u00a0that\u00a0the team could model how fluid flows through a structure with varied spaces, like wrinkles in the brain, or pores in the sponge.\u00a0\u00a0<\/p>\n
\u201cKeeping with the idea of the brain as a sponge, we also thought of it as a dirty sponge \u2014 how do\u00a0you clean a dirty sponge?\u201d Costanzo\u00a0asked.<\/p>\n
\u201cYou run it under a tap and squeeze it out. In our simulations, we were able to get a sense of how the brain moving from an\u00a0abdominal contraction can help induce fluid flow over the brain to help clear waste products.\u201d\u00a0\u00a0<\/p>\n
Drew emphasized that while more work is needed to understand the full implications in humans, this study suggests that body movement may help\u00a0to\u00a0cycle\u00a0cerebrospinal fluid around and in the brain, removing waste and helping to protect against neurodegenerative disorders associated with waste buildup.\u00a0\u00a0<\/p>\n
\u201cThis kind of motion is so small.\u00a0It\u2019s\u00a0what\u2019s\u00a0generated when you walk or just contract your abdominal muscles, which you do when you engage in any physical behavior.\u00a0It could make such a difference for your brain health,\u201d Drew said.\u00a0\u00a0<\/p>\n
Co-authors include C. Spencer Garborg, postdoctoral researcher in Drew\u2019s lab; Beatrice\u00a0Ghitti, who was a postdoctoral researcher\u00a0supervised by both Costanzo and Drew\u00a0at the time of the research and is now a research fellow at the University of Auckland;\u00a0Qingguang\u00a0Zhang, who was an assistant research professor in Drew\u2019s lab and is now an assistant professor of physiology at Michigan State University; Joseph M. Ricotta, who was a postdoctoral researcher in Drew\u2019s lab; Noah Frank, who earned his bachelor\u2019s degree in mechanical engineering from Penn State; Sara J. Mueller, who led the Penn State Center for Quantitative Imaging at the time of the research and is now executive director of the Wildlife Leadership Academy; Denver L. Greenawalt\u00a0and\u00a0Hyunseok\u00a0Lee,\u00a0graduate students at Penn State; Kevin L. Turner\u00a0and Ravi T.\u00a0Kedarasetti, who earned their doctorates from Penn State\u00a0under co-supervision by Drew and Costanzo; and Marceline Mostafa, an undergraduate student\u00a0who earned a degree in\u00a0biology. Microcomputed tomography imaging for this project was performed at the\u00a0Penn State Center for Quantitative Imaging, an\u00a0Institute of the Energy and the Environment core research\u00a0facility.\u00a0<\/p>\n
Funding: The National Institutes of Health, the Pennsylvania Department of Health and the American Heart Association supported this research.\u00a0\u00a0<\/p>\n
Key Questions Answered:Q: Does this mean I need a \u201csix-pack\u201d to have a clean brain?<\/p>\n
A: Not at all. The study found that even the \u201cmicro-contractions\u201d used to maintain posture or take a single step are enough to trigger the hydraulic pump. It\u2019s about consistent, everyday movement rather than intense abdominal strength.<\/p>\n
Q: How is this different from the brain flushing that happens during sleep?<\/p>\n
A: Sleep-based flushing is driven largely by changes in neuron size and heart rate. This new research identifies a mechanical pathway driven by the body\u2019s physical movement. It suggests the brain has multiple \u201ccleaning cycles\u201d\u2014one for when we rest and one for when we move.<\/p>\n
Q: Can I \u201cwash\u201d my brain just by tensing my stomach while sitting?<\/p>\n
A: Technically, yes. The researchers proved that applying controlled pressure to the abdomen (similar to a blood pressure cuff) moved the brain and induced fluid flow without any other bodily movement. Engaging your core is literally a mechanical benefit for your neurons.<\/p>\n
Editorial Notes:This article was edited by a Neuroscience News editor.Journal paper reviewed in full.Additional context added by our staff.About this neuroscience research news<\/p>\n
Author:\u00a0Ashley WennersHerron<\/a>
Source:\u00a0Penn State<\/a>
Contact:\u00a0Ashley WennersHerron \u2013 Penn State
Image:\u00a0The image is credited to Neuroscience News<\/p>\n