A sport in which the athletes purposely hit or collide with each other or inanimate objects, including the ground, with great force and have a higher risk of transmitting blood-borne infections Actions Tackling, body checking, blocking Examples American football, boxing, ice hockey. lacrosse, full contact martial arts (MMA, Taekwondo, puroresu, jujutsu, Muay Thai, judo, and full-contact styles of karate), rodeo, wrestling
"The fact that we have now seen these changes in former rugby league players indicates that they, and likely other Australian collision sport players, are not immune to CTE," Buckland (https://actaneurocomms.biomedcentral.com/articles/10.1186/s40478-019-0751-1) explained, adding the disease can 'only' be diagnosed confidently by examination of the brain after death.
The painful reality of the dangers of playing a collision sport were brought home this week as two-time British and Irish Lions captain Sam Warburton was forced to call it a day aged 29 while Northampton Saints announced a benefit match for Rob Horne, who suffered paralysis of his right arm following a collision last season, aged just 28.
In last week's open letter from academics and health professionals, which was addressed to ministers, chief medical officers and children's commissioners, rugby is described as a "highimpact collision sport".