There is a correlation between repetitive head impacts and a brain disease.
According to the authors, there is conclusive evidence that repetitive head impacts cause chronic traumatic encephalopathy.
Chris Nowinski, lead author of the book, said that sport governing bodies should not lie to the public about the link between the disease and athletes' deaths.
The preventative measures have been asked to be put in place.
The study was conducted by researchers from Oxford Brookes University and other institutions.
The co-senior author said they were surprised at how strong the relationship was between repetitive head impacts and chronic traumatic encephalopathy.
Dr Adam White, executive director of the Concussion Legacy Foundation UK, said, "This analysis shows it is time to include repetitive head impacts and chronic traumatic encephalopathy among other child safety efforts like smoking, sunburns and alcohol."
The global public health discussion of preventable disorders caused by childhood exposure in contact sports like football, rugby, ice hockey and others should include the topic of repetitive head impacts and chronic traumatic encephalopathy.
The paper "Applying the Bradford Hill Criteria for Causation to Repetitive Head Impacts and Chronic Traumatic Encephalopathies" has been published.
From the start of the 2022-23 season, the Football Association will trial a ban on heading in England by players under the age of 12.
Rugby union's governing bodies are being sued by lawyers for 185 players who claim the sport caused brain damage.
Football, rugby and American football are some of the sports that have been linked to the development of chronic traumatic encephalopathy.
The subject of the film "Concussion" is a disease found in the brain of an American football player, and the subject of a TV show. A group of former American football players won a $1 billion settlement against the National Football League.
Evidence linking sports-related brain injury and chronic traumatic encephalopathy was found by Omalu.
When the brain is subjected to a lot of small blows or rapid movements, it can lead to the development of chronic traumatic encephalopathy, orCTE.
Sub-concussions can't be detected on the field of play.
If a history of exposure is evaluated, it is reasonable to conclude that the risk of developing the disease increases.
It has been found in the brains of a number of athletes.
You can listen to Dr Omalu's interview on the Scrum VPodcast.
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