There has been a new call to limit youth heading in New Zealand football to reduce brain injury dangers.
Concerns around the world have seen restrictions introduced in countries such as England, which recommends footballers do no more than 10 "higher force" headers a week in training.
Now a University of Otago lead researcher says New Zealand football bosses will "soon be tasked with addressing this issue".
In a paper published in Science and Medicine in Football, Alex Gilbert says New Zealand should be prudent in taking action to limit heading exposure despite a lack of definitive data proving the link between headers and brain injury.
"Although heading a ball tends to result in relatively small impacts, it's the sheer number of these impacts incurred over a long period of time during training and gameplay which may have a cumulative effect," he says.