Jeff Z. Klein, nytimes.com

Below, the full set of rule changes proposed at USA Hockey's Winter Meeting last weekend in Colorado Springs. The proposals seek to raise the minimum age for body checking in boys hockey from 11-12 to 13-14, make all contact to the head-and-neck area illegal at all age levels and, in those classifications in which fighting does not result in immediate expulsion, provide for extra penalties when one player tears off an his own helmet or an opponent's helmet during a fight.

The rules will be voted on at USA Hockey's annual congress in June.

The rules proposed last weekend to USA Hockey's board of directors are intended to cut down on injuries and arose out of last October's Mayo Clinic summit on concussions and head trauma. Dr. Michael Stuart of the Mayo Clinic is also the chief medical officer for USA Hockey, and he helped frame the rule change proposals and presented them to the board.