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Study casts doubt on theory that retired NFL players suffer CTE
Date:1/27/2014

MAYWOOD, Il. The media have widely reported that a debilitating neurological condition called chronic traumatic encephalopathy (CTE) is a well-established disease in retired athletes who played football and other contact sports. But a study by a Loyola University Medical Center neuropsychologist has found little evidence that CTE actually exists.

"There has not yet been one controlled epidemiological study looking at the risk of late-life cognitive impairment in any collision sport, including boxing, American football or other sports involving repetitive head trauma," Christopher Randolph, PhD, reports in the peer-reviewed journal Current Sports Medicine Reports.

CTE is said to be the cause of behavioral symptoms such as anger, aggression and suicidality, and cognitive symptoms such as impaired learning and memory problems. CTE is thought to be linked to concussions and characterized by the build-up of abnormal substances in the brain called tau proteins.

A 2005 study, co-authored by Randolph, reported that rates of mild cognitive impairment among retired NFL players seemed to be higher than that of the general population. But Randolph noted there were no controls in this study, and results may have been subject to reporting bias.

A more recent study of retired NFL players found that rates of Alzheimer's disease and amyotrophic lateral sclerosis (Lou Gehrig's disease) were higher than that of the general population. But this may be due to the fact that the NFL players had lower overall mortality rates from heart disease and other causes. Since they lived longer, the players naturally would be more likely to get age-related diseases such as Alzheimer's disease.

In addition to having much lower overall mortality rates than the general population, retired NFL players are only 40 percent as likely to die of suicide as men in the general population, according to a 2012 study. It is difficult to reconcile thi
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Contact: Jim Ritter
jritter@lumc.edu
708-216-2445
Loyola University Health System
Source:Eurekalert

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