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The first world record in the 400 metres individual medley in long course (50 metres) swimming was recognized by the International Swimming Federation (FINA) in 1957, followed by the women a year later. In the short course (25 metres) swimming events the world's governing body recognizes world records since March 3, 1991.
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]
Kratochvílová's world record on an indoor track—49.59—stood until 19 February 2023 when the 400-meter indoor world record was broken by Femke Bol from the Netherlands with a time of 49.26. [ 6 ] [ 7 ] [ 8 ] Koch and Kratochvílová are the only women who have broken the 48-second barrier in a laned 400-metre outdoor race. [ 6 ]
The 17-year-old McIntosh is the two-time defending world champion in the 200m butterfly and 400m medley, as well as the world record holder in the 400m individual medley. ... 800m record for 10 ...
The first world record in the men's 800 metres was recognized by the International Association of Athletics Federations in 1912. [1] As of June 21, 2011, 23 world records have been ratified by the IAAF in the event. [2] "y" denotes time for 880 yards (804.68 m) ratified as a record for the 800 m.
World record progression 50 metres freestyle; World record progression 100 metres freestyle; World record progression 200 metres freestyle; World record progression 400 metres freestyle; World record progression 800 metres freestyle; World record progression 1500 metres freestyle; World record progression 4 × 50 metres freestyle relay
Ledecky, the 800m freestyle women’s world record holder, was unable to surpass Canada’s Summer McIntosh’s world-leading time this year of 8:11.39. ... In the women’s 200m individual medley ...
Individual medley: 100 (short course only), 200 and 400; relays: 4×50 free (short course only), 4×100 free, 4×200 free, 4×50 medley (short course only) and 4×100 medley. Also recognized are mixed relay records for 4 × 100 medley and free relays. All records were swum in finals unless noted otherwise.