Image Credentials: Image Title: Repeated Blast Exposures May Harm Brain Health of Military Personnel, Study Finds Source: (Sora.ChatGPT) Date: September 2025. Attribution: Created using AI-generated imagery (Sora.ChatGPT), this does not depict a real-world scene.
By Staff Writer | Open Chronicle Science
Charlottesville, VA – Military personnel repeatedly exposed to battlefield blasts may face significant long-term risks to their brain health, according to new research from the University of Virginia School of Medicine and the Naval Medical Research Command (NMRC).
The study, published with support from the U.S. Department of Defense, found that repeated blast exposure in the special warfare community was linked to heightened brain inflammation and measurable structural changes in critical regions of the brain. These alterations raise concerns about future risks of neurodegenerative disease and impaired cognitive and emotional functioning.
Inflammation and Brain Structure Changes
Researchers compared two groups of military service members: nine special operations personnel with repeated blast exposures and nine counterparts with minimal exposure. Using advanced brain imaging and participant surveys, the team assessed both physical and symptomatic changes.
The results revealed that those with higher blast exposure showed increased inflammation, as well as reduced volume and thickness in key brain structures tied to memory, motor coordination, and emotional regulation.
“This is the first study to directly demonstrate increased inflammation in the brains of service members who are exposed to small blasts over a career,” said James Stone, MD, PhD, a UVA Health radiologist who led the study. “Brain inflammation is such a key process in other brain-related illnesses. These findings raise concerns about the long-term brain health of those exposed to repeated low-level blasts.”
Parallels to Neurodegenerative Disorders
Chronic inflammation is a hallmark of several neurodegenerative diseases, including Alzheimer’s, Parkinson’s, and ALS. The study suggests that similar inflammatory processes could be occurring earlier in military personnel subjected to repeated blast waves, potentially making them more vulnerable to long-term neurological decline.
“This research effort will enable us to understand how repetitive exposure to blast over a career is a risk factor for brain health issues,” said Stephen Ahlers, PhD, of NMRC, who co-led the project. “It may even worsen symptoms from unrelated traumatic brain injuries.”
Guiding Future Protection
The researchers stress that more work is needed to determine “how much is too much” when it comes to blast exposure. Plans are underway for a larger study to better establish exposure thresholds and to guide future military policy.
“Work is currently underway to better understand these findings and to be able to answer the question of ‘how much is too much?’ when it comes to blast overpressure exposure,” Stone explained.
Such insights could inform not only deployment strategies but also the development of next-generation protective equipment for military personnel.
A Broader Effort
This study is part of a larger initiative at UVA, supported by an $8 million Department of Defense grant, to explore how blast shock waves impact brain health. The goal is to improve prevention and treatment strategies, protecting soldiers from potentially lifelong neurological consequences.
As Stone concluded, “Until we know where the safe limits are, the value of proactive monitoring and protective measures for service members exposed to repeated blasts cannot be overstated.”
Story Source:
Materials provided by University of Virginia Health System. Note: Content may be edited for style and length.
Journal Reference:
- James R. Stone, Brian B. Avants, Nicholas Tustison, Jessica Gill, Elisabeth A. Wilde, Kiel D Neumann, Leslie A. Gladney, Madison O. Kilgore, F Bowling, Christopher M. Wilson, John F Detro, Heather Belanger, Katryna Deary, Hans Linsenbardt, Stephen Ahlers. Neurological effects of repeated blast exposure in Special Operations personnel. Journal of Neurotrauma, 2023; DOI: 10.1089/neu.2023.0309
Staff Writers at Open Chronicle produce in-depth, field-informed reporting on defense, diplomacy, cultural transformation, and global affairs. Known for clarity, accuracy, and analytical depth, they connect breaking developments to broader historical and strategic contexts. In addition to frontline journalism, Staff Writers also contribute to the Open Chronicle Encyclopedia, crafting authoritative entries that preserve critical knowledge and enrich public understanding.