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Prevalence and risk factors of Parkinson's disease in retired Thai traditional 
boxers.

Lolekha P, Phanthumchinda K, Bhidayasiri R.

Chulalongkorn Comprehensive Movement Disorders Center, Faculty of Medicine, 
Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red 
Cross Society, Bangkok, Thailand.

Blows to the head are sometimes claimed to have been a cause of Parkinson's 
Disease. Boxing, with its frequent blows to the head is often believed to be a 
cause of Parkinsonism because of chronic repetitive head injury, with Muhammad 
Ali frequently, but very possibly wrongly, cited as an example. Even more 
extreme and frequent blows to the head occur in Kick Boxing, in which 
participants receive not only punches, but also kicks to the head. Kick Boxing 
is at its most extreme in Thailand, where it originated, as the sport of Muay 
Thai. As the blows are more powerful and the contests more frequent, Muay Thai 
tests the impact of blows to the head even more than boxing.

In order to assess the effect of blows to the head, this study determined the 
prevalence of Parkinson's Disease in retired Muay Thai boxers. Out of over 700 
that responded, only 5 of them had Parkinson's Disease, which is not even 1% 
of boxers. So boxing, even in the extreme form found in Thailand, did not make 
Parkinson's Disease likely, nullifying the claim that boxing and blows to the 
head commonly cause Parkinson's Disease. Those Muay Thai boxers that had a 
large number of professional contests were found to be a bit more prone to 
developing Parkinson's Disease. So frequent blows to the head appear to cause 
an inclination to Parkinson's Disease rather than actually cause it.

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