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“There’s no longer a debate that when an athlete is diagnosed with a concussion caused by a sharp blow or a fall, there is a chance it may contribute to brain changes that could either be temporary or permanent,” said study author Ravi S. Menon, Ph.D., FRSC, of Western University in London, Canada. “But what are the effects of the smaller jolts and impacts that come with playing a contact sport? Our study found they may lead to subtle changes in the brains of otherwise healthy, symptom-free athletes.”
The study involved 101 female college athletes, including 70 who played rugby and 31 who participated in either rowing or swimming. A subset of rugby players were followed for at least two years. Swimmers and rowers were followed for one year.
All athletes were concussion-free six months prior to the start of the study and during the study as well, however some rugby players had a concussion history before the six-month period while non-contact athletes had experienced none.
Some of the athletes wore devices to record head impacts, including 37 rugby players and nine rowers. Measurements from the devices found that while rowers did not experience any impacts, 70% of the rugby players experienced an average of three impacts during two practices and one pre-season game.
“While we only looked at these impacts during a few events during the season, previous research has shown these kinds of subclinical impacts may accumulate over years of participation in contact sports,” said Menon.
Researchers used magnetic resonance imaging (MRI) to scan the brains of all the athletes during in- and off-season play. With the brain scans, researchers examined how water molecules moved throughout the white matter to determine if there were microstructural brain changes. They also investigated how different areas of the brain communicated with each other and whether there were any changes in how those areas worked together.
In rugby players, researchers found changes in the microstructure of the white matter, including in nerve fibers that connect areas of the brain that control basic emotions like fear, pleasure and anger. In some of the rugby players, the changes progressed over time. Researchers did not find changes in the brains of swimmers or rowers.
Researchers also found that for rugby players only, the microstructure of the brain changed between in- and off-seasons, specifically in the brain stem, which controls the flow of messages between the brain and body.
Researchers found differences in the functional organization of the brain too. When compared to swimmers and rowers, rugby players had changes in connectivity—how the brain communicates—between the areas of the brain that control memory retrieval and visual processing.
“Even with no concussions, the repetitive impacts experienced by the rugby players clearly had effects on the brain,” said Menon. “More research is needed to understand what these changes may mean and to what extent they reflect how the brain compensates for the injuries, repairs itself or degenerates so we can better understand the long-term health effects of playing a contact sport.”
A limitation of the study was that while the rugby athletes did not experience a diagnosed concussion, there may have been undiagnosed concussions that went unnoticed by the coaching staff or undetected by relatively insensitive clinical tools.
The study was supported by the Schulich School of Medicine & Dentistry at Western University, the Canadian Institutes for Health Research, Brain Canada, Canada First Research Excellence Fund and the Natural Sciences and Engineering Research Council of Canada.
Learn more about concussion at BrainandLife.org, home of the American Academy of Neurology’s free patient and caregiver magazine focused on the intersection of neurologic disease and brain health. Follow Brain & Life® on Facebook, Twitter and Instagram.
The American Academy of Neurology is the world’s largest association of neurologists and neuroscience professionals, with over 36,000 members. The AAN is dedicated to promoting the highest quality patient-centered neurologic care. A neurologist is a doctor with specialized training in diagnosing, treating and managing disorders of the brain and nervous system such as Alzheimer’s disease, stroke, migraine, multiple sclerosis, concussion, Parkinson’s disease and epilepsy.
For more information about the American Academy of Neurology, visit AAN.com or find us on Facebook, Twitter, Instagram, LinkedIn and YouTube.
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