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Key to tables: Time rescinded Retrospectively ratified From 1975 onwards, the IAAF (now World Athletics) accepted separate automatically electronically timed records for events up to 400 metres. Starting January 1, 1977, the IAAF required fully automatic timing to the hundredth of a second for these events.
The first world record in the women's 4 x 100 metres relay was recognised by the International Association of Athletics Federations in 1922. [1] 45 world records have been ratified by the IAAF in the event. The following table shows the world record progression in the women's 4 × 100 metre relay, as ratified by the IAAF. "y" denotes time for 4 ...
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
If on the European continent the metric system is the one almost exclusively used (4 × 100 metres, or a lap of 400 m), where the imperial system is still used (UK, USA and Australia, mainly) this relay was rather ran over the distance of 4 × 110 yards, a total of 402.34 m, and that, until the late 1960s.
The 4×100 metres relay at the World Championships in Athletics has been contested by both men and women since the inaugural edition in 1983. It is the second most prestigious title in the discipline after the 4×100 metres relay at the Olympics. The competition format typically has one qualifying round leading to a final between eight teams.
South Africa, subsequently disqualified for doping after the 2021 World Athletics Relays, finally replaces qualified Ukraine (8th at World Relays) which had withdrawn, as per the 7th and last time of the South African U20 team in Nairobi.
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