大象传媒

High school American footballer Zac Easter took his own life after developing Chronic Traumatic Encephalopathy (CTE) - a rare degenerative brain condition.

A study from Boston University found 99% of American football subjects developed CTE - which is linked to suffering repeated blows to the head.

Zac's mother, Brenda, told 大象传媒 Radio 5 Live Sport more needs to be done to protect players from head traumas in sport.

This clip was first broadcast on 大象传媒 Radio 5 Live Sport on Wednesday, 16 August 2017.