Maybe they don't pay professional athletes enough. Take a look at the photo below to see the effect that repeated concussions have on a formerly healthy brain.
Until recently, the best medical definition for concussion was a jarring blow to the head that temporarily stunned the senses, occasionally leading to unconsciousness. It has been considered an invisible injury, impossible to test -- no MRI, no CT scan can detect it.
But today, using tissue from retired NFL athletes culled posthumously, the Center for the Study of Traumatic Encephalopathy (CSTE), at the Boston University School of Medicine, is shedding light on what concussions look like in the brain. The findings are stunning. Far from innocuous, invisible injuries, concussions confer tremendous brain damage. That damage has a name: chronic traumatic encephalopathy (CTE).
Dead athlete's brains show damage from concussions.
CTE has thus far been found in the brains of six out of six former NFL players.
"What's been surprising is that it's so extensive," said McKee. "It's throughout the brain, not just on the superficial aspects of the brain, but it's deep inside."
CSTE studies reveal brown tangles flecked throughout the brain tissue of former NFL players who died young -- some as early as their 30s or 40s.
McKee, who also studies Alzheimer's disease, says the tangles closely resemble what might be found in the brain of an 80-year-old with dementia.
"I knew what traumatic brain disease looked like in the very end stages, in the most severe cases," said McKee. "To see the kind of changes we're seeing in 45-year-olds is basically unheard of."
The damage affects the parts of the brain that control emotion, rage, hypersexuality, even breathing, and recent studies find that CTE is a progressive disease that eventually kills brain cells.
One man Chris Nowinski, once a Harvard football star, is responsible for starting these studies in the first place.
"I realized when I was visiting a lot of doctors, they weren't giving me very good answers about what was wrong with my head," said Nowinski. "I read [every study I could find] and I realized there was a ton of evidence showing concussions lead to depression, and multiple concussion can lead to Alzheimer's."
Nowinski decided further study was needed, so he founded the Sports Legacy Institute along with Dr. Robert Cantu, a neurosurgeon and the co-director of the CSTE. The project solicits for study the brains of ex-athletes who suffered multiple concussions.