Researchers using magnetic imaging to assess memory have shown that soccer players who frequently head the ball have brain abnormalities resembling those found in patients with concussion (mild traumatic brain injury).
On average, soccer players head the ball six to 12 times during games, where balls can travel at speeds of more than 50 miles per hour. During practice drills, players commonly head the ball 30 or more times. The impact from a single heading is unlikely to cause traumatic brain damage such as laceration of nerve fibers. But scientists have worried that cumulative damage from heading's repeated sub-concussive impacts might be clinically significant. Repetitive heading could set off a cascade of responses that leads to degeneration of brain cells over time, the authors believe.
To study possible brain injury from heading, the researchers used diffusion tensor imaging (DTI), an advanced MRI-based imaging technique, on 37 amateur adult soccer players (median age 31 years) who had all played the sport since childhood. Participants reported playing soccer for an average of 22 years and had played an average of 10 months over the previous year. Researchers ranked the players based on heading frequency and then compared the DTI brain images of the most frequent headers with those of the remaining players. All participants also underwent cognitive testing.
DTI "sees" the movement of water molecules within and along axons, the nerve fibers that constitute the brain's white matter. This imaging technique allows researchers to measure the uniformity of water movement (called fractional anisotropy, or FA) throughout the brain. Abnormally low FA within white matter indicates axon damage and has previously been associated with cognitive impairment in patients with traumatic brain injury.
"The DTI findings pertaining to the most frequent headers in our study showed white-matter abnormalities similar to what we've seen in patients with concussion," said Michael L. Lipton, M.D., Ph.D., associate professor of radiology, of psychiatry and behavioral sciences at Albert Einstein College of Medicine of Yeshiva University. "Soccer players who headed the ball above a threshold between 885 to 1,550 times a year had significantly lower FA in three areas of the temporal-occipital white matter."
Lipton noted that players with more than 1,800 headings per year were also more likely to demonstrate poorer memory scores compared to participants with fewer yearly headings.
"Our study provides compelling preliminary evidence that brain changes resembling mild traumatic brain injury are associated with frequently heading a soccer ball over many years. While further research is clearly needed, our findings suggest that controlling the amount of heading that people do may help prevent brain injury that frequent heading appears to cause."
The study was published online today in the journal Radiology.