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Free substitution or rolling substitution is a rule in some sports that allows players to enter and leave the game for other players many times during the course of a game, generally during a time-out or other break in live play; and for coaches to bring in and take out players an unlimited number of times.
Sports medicine is a branch of medicine that deals with physical fitness and the treatment and prevention of injuries related to sports and exercise. Although most sports teams have employed team physicians for many years, it is only since the late 20th century that sports medicine emerged as a distinct field of health care.
Substitution (law), the replacement of a judge; Substitution (sport), where a sports team is able to change one player for another during a match; Substitution therapy or opiate replacement therapy; Import substitution industrialization, a trade and economic policy; Penal substitution, a theory of the atonement within Christian theology
The assistant referee indicating a substitution Fourth official notifying the referee of the details of the substitution. Substitutions are governed under Law 3 of the Laws of the Game in the (3) Substitution Procedure section. [21] A player can only be substituted during a stoppage in play and with the permission of the referee. The player to ...
Free substitution — apparently intended to help lesser players by allowing longer rest breaks — was implemented in a rule change made April 7, 1943, "for the duration" of the war effort. [7] This was paired with a one-year rule change made in August reducing the size of wartime NFL rosters from 33 players to 28, in an effort to reduce the ...
A substitute can act for the injured or ill player in the field, although they may not bowl, bat or act as captain, unless otherwise agreed by the captains.A player may bat, bowl and field even if they have had a substitute for part of the game, though they need to wait for a period equal to their time off the field until they bat or bowl again.
A platoon system in baseball or American football is a method for substituting players in groups (platoons), to keep complementary players together during playing time.. In baseball, it is usually used to optimize batting performance against pitchers of opposite handedness.
In the American League, a pinch hitter is usually substituted for the position player in whose place he batted (although another common substitution is pinch-hitting a utility infielder for a second baseman and subsequently switching him for the shortstop in the field while moving the shortstop over to the now-vacant second base position).