NFL: Ravens' Urschel Retires After New Brain Study Released

WASHINGTON, , (APP - UrduPoint / Pakistan Point News - 28th Jul, 2017 ) - John Urschel, a 26-year-old offensive lineman with the Baltimore Ravens, retired from the NFL on Thursday, two days after researchers said they found that 99 percent of the brains of deceased players studied showed degenerative brain disease.

Urschel, who holds bachelor's and master's degrees and is a doctoral candidate in mathematics at the Massechusetts Institute of Technology, did not discuss the reason's for his retirement publicly.

However, in January the Canaidan-born player told HBO that being knocked unconscious after a helmet-to-helmet hit and suffering a concussion already had an impact on his mind. "I think it hurt my ability to think well mathematically," Urschel said.

"It took me about three weeks before I was football ready. It took me a little bit longer before my high-level visualizations ability came back." "This morning John Urschel informed me of his decision to retire from football," coach John Harbaugh said in a statement.

"We respect John and respect his decision. We appreciate his efforts over the past three years and wish him all the best in his future endeavors.

" In three seasons with the Ravens, Urschel appeared in 40 games with 13 starts, including three last season.

On Tuesday, the Journal of the American Medical Association published a new study in which researchers found striking evidence of chronic traumatic encephalopathy in 110 of the 111 donated brains of deceased players who competed in the National Football League.

CTE causes symptoms including memory loss, vertigo, depression and dementia. Problems can crop up years after a player's career has ended. The NFL has faced growing scrutiny in recent years linked to the issue of concussions and head trauma, with the league agreeing in 2015 on a $1 billion settlement to resolve thousands of lawsuits by former players suffering from neurological problems.

Though the research -- the largest CTE study published to date -- suggests the disease may be related to prior participation in football, researchers cautioned against extrapolating the results to the general population. Because the brains studied were for the most part donated by concerned families, they do not necessarily represent all people who have played the rough contact sport.