(Corrects headline, story to show study was conducted by three doctors, not the American Medical Association; corrects medical term cardiometabolic, not cardiometric, in last two paragraphs. Adds link to study in second paragraph)
By Dan Whitcomb
Feb 1 (Reuters) - A study on the health of football players released on Thursday found career participation in the NFL was not associated with a statistically significant increase in death rates, at least when compared with other players who spent less time in the league.
The study published in the Journal of the American Medical Association compared 2,933 athletes who played in the National Football League for an average of five years to 879 "replacement players" who filled in for three games during a mid-1980s strike, finding no statistically significant difference in rates of death from all causes. (bit.ly/2nsXncu)
Critics said the study had several flaws and pointed to a separate study released last year that found 99 percent of deceased former NFL players whose brains were analyzed post-mortem showed signs of chronic traumatic encephalopathy, a disease linked to repeated hits to the head that can lead to aggression and dementia.
The NFL, which has been accused of tolerating head injuries as part of the sport, has changed rules ahead of the Super Bowl on Sunday in Minneapolis, requiring players who show signs of a seizure to be pulled from the game.
At future games, athletes who stumble to the ground when trying to stand will be examined in their team locker room, the league said last month. More neurotrauma consultants not affiliated with specific teams will be on the field and at the NFL’s command center to monitor players.
The NFL did not respond to a request for comment on the latest study.
The study was authored by three medical doctors: Atheendar Venkataramani of the University of Pennsylvania, Philadelphia, and the Leonard Davis Institute of Health Economics in Philadelphia; Maheer Gandhavadi of the Everett Clinic and the Providence Regional Medical Center in Everett, Washington; and Anupam Jena of Harvard Medical School, Massachusetts General Hospital and the National Bureau of Economic Research in Cambridge, Massachusetts.
Chris Nowinski, chief executive officer of the Concussion Legacy Foundation, said that the study was hampered because the career NFL players involved were too young to have died from the effects of CTE.
“But even if they were older the presence of the disease and what gets written on death certificate are two separate things,” Nowinski said. “That’s a well-established problem in looking at death records and trying to establish dementia.”
Nowinski also said that even the replacement players likely had spent eight to 12 years playing competitive football - including high school, college and some time in professional leagues - meaning that they could have sustained nearly as much head trauma as the NFL veterans.
So far, CTE can be diagnosed only by taking brain tissue from a dead subject. A January study in the scientific journal Brain found more evidence that all hits to the head, not just those that cause concussions, can contribute to CTE.
The latest study found that the leading cause of death among the NFL career players was cardiometabolic disease, followed by transportation injuries and unintentional injuries.
Among the replacement players the leading cause of death was cardiometabolic disease followed by self-harm and interpersonal violence and then neoplasms.
Reporting by Dan Whitcomb in Los Angeles; editing by Lisa Shumaker