"…what we can say is that young athletes, particularly adolescents, tend to experience concussion symptoms for a longer period of time than adults….the brain may be more vulnerable to injury while in a highly developmental stage."
Gilbert reported that the USA bans headers for all players 10 and under, and limits it to 20 per week for ages 11 to 13.
The United Kingdom has updated its junior guidelines which limit exposure to headers to all levels including professionals.
The Guardian recently reported that all English football club may be asked to significantly adapt training methods. This would restrict higher force headers, those from long passes and corners, to 10 a week in training.
Gilbert wrote: "…it's essential that players, coaches, parents and patrons of the sport understand the rationale for adopting any restrictions."
It was important to follow up by assessing how effective the regulations were. Future research might allow the restrictions to be reversed, he said.