Conversation so far:
helmets were designed to protect players from what
Today's professional helmets are primarily made by two companies: Riddel and Schutt. Both manufacturers have released helmets designed specifically to protect against concussions.
how well are football players protected from concussions with helmets
A new study finds that football helmets currently used on the field may do little to protect against hits to the side of the head.
how often do football players get hit in the head
An individual football player can receive as many as 1400 head impacts during a single season.

Question: what are the long-term effects
Self-contained rewrite: what are the long-term effects of head impacts in contact sports