INDIANAPOLIS (AP) — College football teams will be required to hold at least seven padless practices during the preseason and the number of contact practices will be reduced from 21 to 18 under changes proposed by the NCAA's oversight committee. The football oversight committee’s proposal goes to the Division I Council for approval this month. It is expected to pass and go into effect next season. The changes to preseason practice come after a five-year study of six major college football teams showed players suffered more concussions during preseason practices than during games.