Football/Soccer/Scientist friends,
This is a landmark study (see Grinberg et al. (2016). It shows the confirmation of chronic traumatic encephalopathy (CTE) in the post-mortem brain of a soccer player WITHOUT any history of concussion. By the way, the player (though he isn't named) is almost certainly Hilderado Bellini - a legend of the game. Bellini won the world cup with Brazil and played for some of the premier Brazilian clubs of his time.
The no-history of concussion is important, b/c it supports the idea that subconcussive impacts in soccer may be sufficient to produce CTE. And, honestly, as an aficionado of the beautiful game, this is somewhat troubling.
Why is it troubling? Because for the longest time, I (and many) assumed that CTE would rear it's ugly head in the world of soccer, and while there have been some reports of possible CTE in soccer players (see Hales et al. (2014) , this is the first (to my knowledge) which highlights the history of no-concussion.
There are caveats to over-interpreting this study-
1. This gentleman was playing soccer in the 50s - a time where diagnosing concussions wasn't the norm. Therefore, it is entirely possible that he did experience concussions - but were never diagnosed.
Why is this study relevant to soccer?
Subconcussive injuries are asymptomatic. Therefore, they pose a greater risk to athletes than concussions because they are impossible to diagnose. If the link between subconcussive injuries and soccer is confirmed, perhaps we need to have a serious discussion about heading.
Do we know for sure that heading leads to subconcussive injuries?
No, far from it. There's little evidence for it, except this one study that suggests that heading in amateur soccer players leads to abnormal white matter (the stuff that allows brain cells to send messages to each other) restructuring ( see Lipton et al. (2013)). But, this is far from confirmation of the above.
It is interesting to note that Bellini was a central defender - a position which involves the most heading in a game (I don't have data to support this, but, it would be fairly obvious to anyone that plays/watches soccer). Therefore, the repeated subconcussive injury issue is consistent with what we might expect.
As more and more soccer players donate their brains to science, I expect us to see an increase in CTE diagnosis. With the suicides of Robert Enke and Gary Speed - two well known, high profile, footballers, the interest in CTE was always going to rise.
I'm not sure what the long-term impact will be on soccer. But, we are at the beginning stages of raising awareness for what might be an insidious beast preying upon our beloved soccer-playing heroes.
Pubmed link: Link to original study
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