A new study has revealed details of the frequency of head injuries in water polo sports and the positions in which players were most likely to get injured.
The first-of-its-kind report, which tracked several dozen male collegiate water polo players over three seasons, was published in PLOS One.
"For years, water polo's head trauma risks have been downplayed or overshadowed by football-related brain injuries," said study co-author James Hicks.
"Our data quantifies the extent of the problem and sets the stage for additional research and possible rule changes or protective gear to improve water polo safety," added Hicks.
During the study, players wore caps embedded with electronic sensors. Over time, every participant got bopped in the head by balls or rival players, but some fared worse - occasionally far worse than others.
Offensive players were more likely to get battered than defensive and transition positions (60 per cent versus 23 per cent and 17 per cent, respectively). And swimmers attacking from the left side of the goal suffered more head hits than players on the right, possibly because right-handed athletes commonly throw shots from the left zone, so there's more activity in that area, researchers theorised.
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The most unsafe position, according to the study, was an offensive centre. On average, those players endured nearly seven blows to the skull per game, which amounted to 37 per cent of all head impacts recorded by the researchers. In contrast, the second-most vulnerable position, defensive centre, averaged two head strikes a game, the study found.
Overall, researchers counted an average of 18 head hits per game. Although no concussions were diagnosed, the force of the blows was "similar to those observed in collegiate soccer, another sport that is commonly studied for the risks associated with repeated head impact exposure," Hicks said.
Next up the researchers are preparing a manuscript that details how water polo headshots affect brain function.
Hicks got interested in the subject while watching his three sons play the sport. "People who have never seen a game may not realize how physical it is," he said.
"Balls flying up to 50 mph. I have witnessed players get dragged out of the pool in a daze after a blow to the head, and I have sat in an emergency room while my kid received stitches from being struck in the face. I began to wonder what the concussion rate was."
After discovering a dearth of studies, he launched his own. In the first, published three years ago in Frontiers in Neurology, Hicks and Dr Steven Small surveyed 1,500 USA Water Polo members and discovered that 36 per cent recalled suffering at least one concussion during their playing career.