Navigation Links
Football findings suggest concussions caused by series of hits
Date:2/2/2012

WEST LAFAYETTE, Ind. - A two-year study of high school football players suggests that concussions are likely caused by many hits over time and not from a single blow to the head, as commonly believed.

Purdue University researchers have studied football players for two seasons at Jefferson High School in Lafayette, Ind., where 21 players completed the study the first season and 24 the second season, including 16 repeating players.

Helmet-sensor impact data from each player were compared with brain-imaging scans and cognitive tests performed before, during and after each season.

"The most important implication of the new findings is the suggestion that a concussion is not just the result of a single blow, but it's really the totality of blows that took place over the season," said Eric Nauman, an associate professor of mechanical engineering and an expert in central nervous system and musculoskeletal trauma. "The one hit that brought on the concussion is arguably the straw that broke the camel's back."

Researchers evaluated players using a type of brain imaging technology called functional magnetic resonance imaging, or fMRI, along with a computer-based neurocognitive screening test. The fMRI scans reveal which parts of the brain are most active during specific tasks.

Thomas Talavage, an expert in functional neuroimaging and co-director of the Purdue MRI Facility, said the scans indicate players are adapting their mental processes to deal with brain changes.

"The changes in brain activity we are observing suggest that a player is having to use a different strategy to perform a task, and that is likely because functional capacity is reduced," Talavage said. "The level of change in the fMRI signal is significantly correlated to the number and distribution of hits that a player takes. Performance doesn't change, but brain activity changes, showing that certain areas are no longer being recruited to perform a task."

Findings, detailed in a paper to appear online in the Journal of Biomechanics, are contrary to conventional thinking.

"Most clinicians would say that if you don't have any concussion symptoms you have no problems," said Larry Leverenz, an expert in athletic training and a clinical professor of health and kinesiology. "However, we are finding that there is actually a lot of change, even when you don't have symptoms."

The paper was written by mechanical engineering graduate student Evan Breedlove, Nauman, Leverenz, Talavage, former Purdue professor of educational studies Jeffrey Gilger, biomedical engineering graduate student Meghan Robinson, health and kinesiology graduate student Katherine E. Morigaki, electrical and computer engineering graduate student Umit Yoruk, mechanical engineering undergraduate student Kyle O'Keefe, and undergraduate student in electrical and computer engineering Jeffrey King. Gilger is now a researcher at the University of California, Merced.

The research may help to determine how many blows it takes to cause impairment, which could lead to safety guidelines on limiting the number of hits a player receives per week.

"Any change in fMRI data is a concern, but we don't yet know what these changes mean, what they translate to, in terms of cognitive impairment," Breedlove said.

A common assumption in sports medicine is that certain people are innately more susceptible to head injury. However, the new findings suggest the number of hits received during the course of a season is the most important factor, Talavage said.

"Over the two seasons we had six concussed players, but 17 of the players showed brain changes even though they did not have concussions," Talavage said. "There is good correlation with the number of hits players received, but we need more subjects."

The researchers have expanded the study to include an additional high school football team and girls' soccer.

"We want to increase the number of football players in the study and also include soccer to study athletes who don't wear head protection," Nauman said. "We also want to include girls to see whether they are affected differently than boys."

The research findings represent a dilemma because they suggest athletes may suffer a form of injury that is difficult to diagnose.

"This might be especially important in young people because the brain is still developing, so even though subtle unexpressed damage doesn't manifest as a concussion it could affect the brain later in life," Gilger said.

Changes were seen in regions of the brain that have been associated with chronic traumatic encephalopathy (CTE), a progressive degenerative disease found in people who suffer numerous concussions and other forms of head injury.

"This is still circumstantial evidence, but it suggests that whether you are concussed or not your brain is changing as a result of all these hits, and the regions most affected are the ones that exhibit CTE," Nauman said.

Players in the study received from 200 to nearly 1,900 hits to the head in a single season, with two players exceeding 1,800 hits. Helmet-sensor data indicated impact forces to the head ranged from 20 Gs to more than 100 Gs.

"The worst hit we've seen was almost 300 Gs," Nauman said.

A soccer player "heading" a ball experiences an impact of about 20 Gs.

Findings could aid efforts to develop more sensitive and accurate methods to detect cognitive impairment and concussions; more accurately characterize and model cognitive deficits that result from head impacts; determine the cellular basis for cognitive deficits after a single impact or repeated impacts; and develop new interventions to reduce the risk and effects of head impacts.

"Now that we know there is definitely a buildup of damage before the concussion occurs, ultimately, there is hope that we can do more to prevent concussions," Nauman said.

The work is ongoing and supported with grants from the Indiana State Department of Health's Spinal Cord and Brain Injury Research Fund, General Electric Healthcare, the Indiana Clinical and Translational Sciences Institute, and through the National Science Foundation and National Defense Science and Engineering Graduate Fellowships.

Researchers also will follow the case studies of players who take the most hits to see if there is evidence of permanent changes in brain structure using MRI scans.

The research group, called the Purdue Neurotrauma Group (PNG), also is studying ways to reduce traumatic brain injury in soldiers who suffer concussions caused by shock waves from explosions.


'/>"/>

Contact: Emil Venere
venere@purdue.edu
765-494-4709
Purdue University
Source:Eurekalert  

Related biology news :

1. What makes a great footballer?
2. Brain changes found in football players thought to be concussion-free
3. In the best youth football teams, the first team players develop their bodies more rapidly
4. Virginia Tech announces football helmet ratings for reducing concussion risk
5. Virginia Tech biomedical engineers announce child football helmet study
6. September 2007 Sumatran earthquakes research findings
7. Findings uncover new details about mysterious virus
8. Nearly a century later, new findings support Warburg theory of cancer
9. New research findings may enable earlier diagnosis of uterine cancer
10. Therapeutic cloning gets a boost with new research findings
11. International climate change researchers meet, review latest findings
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Football findings suggest concussions caused by series of hits
(Date:3/23/2017)... PUNE, India , March 23, 2017 The report ... Equipment, Touchless Biometric), Industry, and Geography - Global Forecast to 2022", published by ... growing at a CAGR of 29.63% between 2017 and 2022. ... ... Logo ...
(Date:3/20/2017)... At this year,s CeBIT Chancellor Dr. Angela ... The Chancellor came to the DERMALOG stand together with the Japanese Prime ... partner country. At the largest German biometrics company the two government leaders ... iris recognition as well as DERMALOGĀ“s multi-biometrics system.   ... ...
(Date:3/9/2017)... and MOUNTAIN VIEW, Calif. , March ... Made Simple," and 23andMe , the leading personal ... food choices.  Zipongo can now provide customers with personalized ... health goals and biometrics, but also genetic markers impacting ... Zipongo,s personalized food decision support platform uses ...
Breaking Biology News(10 mins):
(Date:3/27/2017)... -- The new research portal will give visitors ... on Valero Energy , offering extensive market research on ... ... http://photos.prnewswire.com/prnh/20160330/349511LOGO) The latest trend gaining momentum ... today, even though touted as a green alternative to fossil ...
(Date:3/27/2017)... , March 27, 2017 DarioHealth Corp. (NASDAQ: ... health and big data solutions, today announced that it ... coverage option for U.S. consumers who want to have ... DarioHealth has signed strategic alliance agreements with partners across ... coverage benefits, and if approved, will supply and bill ...
(Date:3/24/2017)... -- Research and Markets has announced the addition of ... Business Report" report to their offering. ... This report analyzes the Global market ... estimates and forecasts are provided for the period 2014 through 2022. ... The report profiles 25 companies including many key ...
(Date:3/24/2017)... Agenus Inc. (NASDAQ: AGEN), an immuno-oncology company ... vaccines, today announced participation at the following conferences: ... and Maidstone Life Sciences conference "Cancer Immunotherapy Conference" at ... New York, NY . Agenus will participate in ... am: Robert B. Stein , M.D., Ph.D., President, ...
Breaking Biology Technology: