-- Mary Elizabeth Dallas
FRIDAY, Feb. 21, 2014 (HealthDay News) -- Heading a soccer ball
-- a common move on the playing field -- can have serious,
long-term effects on the brain, warns a Canadian researcher.
Concussions account for as many as 8.6 percent of injuries in
soccer, according to a study by Dr. Tom Schweizer, director of the
neuroscience research program at St. Michael's Hospital in Toronto.
Some of these concussions are caused by collisions, while others
come from heading -- deliberately using your head to control the
Not enough attention is paid to the consequences of this
particular tactic, which can have lasting effects on thinking and
memory even when the blows to the head aren't severe enough to
cause a concussion, Schweizer said.
"The practice of heading, which might occur thousands of times over a player's career, carries unknown risks, but may uniquely contribute to cognitive decline or impairment in the short- or long-term," Schweizer explained in a hospital news release.
"Thus, soccer players present a unique opportunity to study whether cumulative sub-concussive impacts affect cognitive functioning, similar to that of concussions," he said.
In a review of existing studies published online recently in the
Brain Injury, Schweizer examined how often concussions occur
One study revealed that nearly 63 percent of varsity soccer
players had symptoms of a concussion at some point, but only about
19 percent knew it. In another study, nearly 82 percent of players
who had at least one concussion had two or more of these head
injuries. The research found that those who suffered one concussion
had a 3.15 times greater chance of having another one than players
who never had this type of injury.
A separate study also revealed that soccer-related concussions
accounted for 15 percent of all sports concussions. Girls' soccer
was second only to football for sports-related concussions,
accounting for 8.2 percent of these head injuries, the study
The long-term result of these head injuries included problems
with memory, planning and perception, the review found. One study
noted that professional soccer players who engaged in the most
heading performed the worst on verbal and visual memory tests as
well as tests of their attention span. A separate study also found
older and retired players had significant problems with conceptual
thinking, reaction times and concentration.
The studies that involved brain imaging found players who
suffered concussions had physical changes to their brain.
Preventive measures can be taken to protect soccer players from
serious head injuries, the study authors said.
"Use of protective headgear, limiting heading exposure or stressing proper heading technique in younger children and increasing concussion education are all suggestions to perhaps decrease the incidence of head injury and their subsequent effects in the long run," study co-author Monica Maher, who is studying for a master's degree in neuroscience at the University of Toronto, said in the news release.
Soccer, the most popular and fastest-growing sport in the world,
is played by 27 million people in North America, according to the
The Brain Injury Association of America provides more
concussions and other head injuries.
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