Head injuries, including concussions, particularly in the game of American football, have become a subject of deep concern, much study and even Congressional hearings in the United States. Concussions Contrary to popular belief, a concussion is not a bruise to the brain caused by hitting a hard surface. Indeed, no physical swelling or bleeding is usually seen on radiological scans. The injury generally occurs when the head either accelerates rapidly and then is stopped, or is spun rapidly.

This violent shaking causes the brain cells to become depolarized and fire all their neurotransmitters at once in an unhealthy cascade, flooding the brain with chemicals and deadening certain receptors linked to learning and memory. The results often include confusion, blurred vision, memory loss, nausea and, sometimes, unconsciousness. Neurologists say once a person suffers a concussion, he is as much as four times more likely to sustain a second one.

Moreover, after several concussions, it takes less of a blow to cause the injury and requires more time to recover.Studies on Head Injuries A 2000 study surveyed 1,090 former N. F.

L. players and found more than 60 percent had suffered at least one concussion in their careers and 26 percent had had three or more. Those who had had concussions reported more problems with memory, concentration, speech impediments, headaches and other neurological problems than those who had not, the survey found.

A 2007 study conducted by the University of North Carolina’s Center for the Study of Retired Athletes found that of the 595 retired N. F. L. layers who recalled sustaining three or more concussions on the football field, 20.

2 percent said they had been found to have depression. That is three times the rate of players who have not sustained concussions. Read More… As scrutiny of brain injuries in football players has escalated in the past few years, with prominent professionals reporting cognitive problems and academic studies supporting a link more generally, the N.

F. L. and its medical committee on concussions have steadfastly denied the existence of reliable data on the issue.But in September 2009, a study commissioned by the N. F. L.

reported that Alzheimer’s disease or similar memory-related diseases appear to have been diagnosed in the league’s former players vastly more often than in the national population — including a rate of 19 times the normal rate for men ages 30 through 49. The study, which was conducted by the University of Michigan’s Institute for Social Research, has not been peer-reviewed, but the findings fall into step with several recent independent studies regarding N.F. L. players and the effects of their occupational head injuries.

Congressional Hearing After the study results were reported, Representative John Conyers Jr. , a Michigan Democrat and chairman of the House Judiciary Committee, held a hearing on the impact of head injuries sustained by N. F. L. players. The league and Commissioner Roger Goodell had insisted that the N. F.

L. ‘s policies were safe and that no third-party involvement was necessary, pointing to research by its committee on concussions as proof.But after an embarrassing hearing on the issue before the House Judiciary Committee in which the league was compared to the tobacco industry, the doctors leading the league’s committee resigned. In December 2009, the league announced that it would impose its most stringent rules to date on managing concussions, requiring players who exhibit any significant sign of concussion to be removed from a game or practice and be barred from returning the same day. Several members of Congress portrayed Mr.

Goodell and the league as impeding proper player care and obfuscating the long-term effects of concussions.The league and a former co-chairman of its committee on brain injuries, Dr. Ira Casson, have consistently played down studies and anecdotal evidence linking retired N.

F. L. players to brain damage commonly associated with boxers and dementia rates several times that of the national population. The N. F.

L. Players Association called for the removal of Dr. Casson, saying that he is too biased to lead the research and policy group. On Nov. 24, 2009, Dr. Casson and Dr. David Viano, co-chairmen of the committee, resigned from the group.

In a memo to all teams in which he outlined several measures regarding concussions, Commissioner Goodell said that Dr. Casson and Dr. Viano would “continue to assist the committee,” but offered no details of any future relationship. Several doctors testified to links they have found between sports head trauma and later cognitive degeneration. Dr.

Ann McKee, who has studied the brains of football players after death, testified that she believed the connection was clear and called for immediate changes to the game and concussion treatment. Changes in N. F.

L. RulesThe National Football League on Dec. 3, 2009, announced that it would impose its most stringent rules to date on managing concussions, requiring players who exhibit any significant sign of concussion to be removed from a game or practice and be barred from returning the same day.

The league’s former practice of allowing players to return when their concussion symptoms subside has been criticized for putting its players at risk. It is widely known that symptoms of a concussion can reappear hours or days after the injury, indicating that the player had not healed from the initial blow.Symptoms that require immediate removal include amnesia, poor balance and an abnormal neurological examination, whether or not those symptoms quickly subside. For symptoms like dizziness and headache, however, a player can return to the field unless they are “persistent,” the statement said. In July 2010, the N. F.

L. asserted greater risks of head injury and toughened warnings by producing a poster that bluntly alerts its players to the long-term effects of concussions, using words like “depression” and “early onset of dementia. Limited Standard for Helmets Football helmets are made in a largely unmonitored world. The one helmet standard was written by the National Operating Committee on Standards for Athletic Equipment, or Nocsae, a volunteer consortium that includes, and is largely financed by, the helmet makers themselves. Nocsae accepts no role in ensuring that helmets, either new or old, meet even its limited requirement. The standard has not changed meaningfully since it was written in 1973, despite rising concussion rates in youth football.Moreover, used helmets worn by the vast majority of young players encountered stark lapses in the industry’s few safety procedures.

Some of the businesses that recondition helmets ignored testing rules, performed the tests incorrectly or returned helmets that were still in poor condition. More than 100,000 children are wearing helmets too old to provide adequate protection — and perhaps half a million more are wearing potentially unsafe helmets that require critical examination, according to interviews with experts and industry data.Awareness of head injuries in football was heightened in October 2010 when helmet-first collisions caused the paralysis of a Rutgers University player, a concussion to Philadelphia Eagles receiver DeSean Jackson and injuries to three other N.

F. L. players. Although some injuries are unavoidable results of football physics, helmet standards have not kept up with modern football, industry insiders said. After more than 100 high school and college football players in the 1960s were killed by skull fractures and acute brain bleeding, Nocsae was formed to protect players against the extreme forces that caused those injuries.The resulting standard, phased in by all levels of football through the 1970s, requires helmets to withstand a 60-inch free fall without allowing too much force to reach the skull. This standard has accomplished its intent: skull fractures in football have essentially disappeared, and the three or four football-related deaths each year among players under 18 are caused by hits following a concussion that has not healed (known as second-impact syndrome) rather than by a single fatal blow.

But as the size and speed of players have increased since the full adoption of the Nocsae standard in 1980, concussion rates have as well.While bicycle helmets are designed to withstand only one large impact before being replaced, football helmets can encounter potentially concussive forces hundreds of times a season. Helmets cannot get too large or heavy, so helmet designers say they face a trade-off: make helmets stiff enough to withstand high impacts and allow less violent forces to cause concussions, or more softly cushion against concussive-type forces while allowing large impacts to crack the skull. The helmet industry has essentially chosen the former.

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