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This article includes the world record progression for the 4×100 metres medley relay, and it shows the chronological history of world record times in that competitive swimming event. The 4×100 metres medley relay is a medley race in which each of four swimmers on a team swims a 100-metre leg of the relay, each swimming a different stroke, in the following sequence: # Backstroke (this can only be the first stroke, due to the necessity of starting this leg in the pool rather than by diving in); # Breaststroke; # Butterfly; and # Freestyle ("freestyle" means any stroke other than backstroke, breaststroke or butterfly – most swimmers use the front crawl). Swimming world records are recognized by and maintained by FINA ("Fédération Internationale de Natation"), the international competitive swimming and aquatics federation that overseas the sport in international competition. World records in the medley relay event were first recognized by FINA in 1953. The long course (50-metre pool) world records are historically older than the short course (25-metre pool) records. FINA amended its regulations governing the recognition of world records in 1956; specifically, FINA mandated that only record times that were contested in 50-metre (or 55-yard) pools were eligible for recognition after that time.〔Craig Lord, "( A Time of Change for World Records )," SwimVortex.com (28 May 2013). Retrieved 20 March 2015.〕 The short-course world records have been separately recognized since 1991. It is possible to set an individual world record in the 100 metres backstroke by swimming the backstroke first leg of the 4×100-metre medley relay. Swimming the other three legs of the medley relay cannot qualify as world records as FINA criteria requires a "static start" for world record recognition – swimming relay exchanges are characterized as "dynamic". The first Olympics at which the 4×100-metre medley relay event was contested was the 1960 Summer Olympics in Rome. ==Men== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「World record progression 4 × 100 metres medley relay」の詳細全文を読む スポンサード リンク
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