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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]
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.
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
Note: Portions of this rule were changed in September 2008 so that only swimmers who are representing the USA at the time of the swim, or capable of representing the USA, are eligible. This follows Mike Alexandrov's setting of the American Record in the 100 yd breaststroke at a time when he was swimming internationally for Bulgaria.
White Rock Wave Swim Club 20 January 2024 99 years, 176 days Victoria Masters Swim Club Meet Saanich, Canada [83] 100 metres backstroke: 25-29 30-34 1:01.78 Noriko Inada (JPN) Phoenix Masters 5 August 2011 33 years, 9 days USMS Nationals Auburn, Alabama [19] 35-39 1:01.75 Noriko Inada (JPN) Phoenix Swim Club 19 August 2017 39 years, 23 days
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. Records are recognized for long course (50 m pool) and short course (25 m pool) in the following events: freestyle: 50, 100, 200, 400, 800 and 1500;
In 1933, Lenore Kight swam the 880 yard freestyle in 11:44.0, which FINA recognised as a world record in the 800 metres freestyle but not in the 880 yard freestyle. This irregularity was finally resolved in 1935, when Kight's 11:34.4 in the 880 yard freestyle broke the records for both the 880 yard freestyle and the 800 metres freestyle. [1]
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]