Longer rugby careers linked to higher risk of brain injury - study

A study of former rugby players' brains has found that those who played for longer were more likely to develop a degenerative brain disease.

Out of 31 donated brains analysed, 21 had evidence of a condition linked to repeated head injuries and concussion.

Nearly two-thirds of those affected by chronic traumatic encephalopathy (CTE) played at amateur level.

The researchers say their findings back up calls to reduce head impacts in all sports.

CTE is a brain condition thought to be caused by repeated head injuries and blows to the head. It slowly gets worse over time and leads to dementia.

People who regularly play contact sports such as football, boxing, rugby and American football have a higher chance of developing it, post-mortem studies have shown.

In this study, led by the University of Glasgow, scientists analysed the brains of 23 amateur and eight professional rugby players which had been donated for medical research.

With an average playing career of 18 years, 68% of the brains had traces of the brain condition CTE.

Thirteen of the affected brains belonged to club players, not professionals.

And the study calculated that with each extra year of rugby played, there was a 14% increase in the risk of developing CTE.

"It's the shaking and twisting and rotating of the head thousands of times over decades that's likely to cause deep damage in the brain," says Prof Willie Stewart, lead study author from the University of Glasgow.

He compares a head impact in rugby to "a spinning bowl of porridge" where the brain is the wobbly porridge in the middle.

Prof Stewart said reducing head impacts in rugby games and in training was what was needed, but the sport was currently not doing enough to address the problem.

The ex-players' brains in the study were donated to three brain banks - in Glasgow, at the Australian Sports Brain Bank in Sydney and at the Boston University School of Medicine.

With an average age of 60 when they died, most of the former players in the study played rugby before it became professional in 1995.