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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. [1]
The world record in the men's 50 yards freestyle is not an official record ratified by World Aquatics (previously FINA), which only recognizes records set in meters. . Practically, the unofficial world record is now limited today to swimmers competing in the United States, as short course races in yards are only currently used for record keeping in the Unit
On 25 July 2013, FINA Technical Swimming Congress voted to allow world records in the long course mixed 400 free relay and mixed 400 medley relay, as well as in six events in short course metres: the mixed 200 medley and 200 free relays, as well as the men's and women's 200 free relays and the men's and women's 200 medley relays. [6]
Likewise more historical times by juniors were also not considered (e.g. Mary T. Meagher's 2:05.96 in the 200 m butterfly). Long Course records can be established by breaking the initial time at a meet after April 1, 2014. [2] FINA World Junior Records in 25m pool are recognised starting on January 1, 2015.
Freestyle races are the most common of all swimming competitions, with distances beginning with 50 meters (55 yards) and reaching 1,500 meters (1,600 yards), [2] also known as the mile. The term 'freestyle stroke' is sometimes used as a synonym for ' front crawl ', [ 3 ] as front crawl is the fastest surface swimming stroke. [ 4 ]
This article includes the world record progression for the 4×50 metres freestyle relay and it shows the chronological history of world record times in that competitive short course swimming event. The 4×50 metres freestyle relay is a relay event in which each of four swimmers on a team swims a 50-metre freestyle leg in sequence.
World Aquatics Championships (50 m pool, open water), pool since 1973, open water since 1991 [3] [5] World Swimming Championships (25 m pool), since 1993, for example 2021 FINA World Swimming Championships (25 m) [3]
This article includes the world record progression for the 4×200 metres freestyle relay, and it shows the chronological history of world record times in that competitive swimming event. The 4×200 metres freestyle relay is a relay event in which each of four swimmers on a team swims a 200-metre freestyle leg in sequence.