400 metres

Athletics
400 metres
400m CIF San Diego Championship 2007.jpg
The closing stages of a men's 400 m race
Men's records
WorldSouth Africa Wayde van Niekerk 43.03 (2016)
OlympicSouth Africa Wayde van Niekerk 43.03 (2016)
Women's records
WorldEast Germany Marita Koch 47.60 (1985)
OlympicFrance Marie-José Pérec 48.25 (1996)

The 400 metres, or 400 metre dash, is a sprinting event in track and field competitions. It has been featured in the athletics programme at the Summer Olympics since 1896 for men and since 1964 for women. On a standard outdoor running track, it is one lap around the track. Runners start in staggered positions and race in separate lanes for the entire course. In many countries, athletes previously competed in the 440 yard dash (402.336 m)—which is a quarter of a mile and was referred to as the 'quarter-mile'—instead of the 400 m (437.445 yards), though this distance is now obsolete.

Like other sprint disciplines, the 400 m involves the use of starting blocks. The runners take up position in the blocks on the 'ready' command, adopt a more efficient starting posture which isometrically preloads their muscles on the 'set' command, and stride forwards from the blocks upon hearing the starter's pistol. The blocks allow the runners to begin more powerfully and thereby contribute to their overall sprint speed capability. Maximum sprint speed capability is a significant contributing factor to success in the event, but athletes also require substantial speed endurance and the ability to cope well with high amounts of lactic acid to sustain a fast speed over a whole lap. While considered to be predominantly an anaerobic event, there is some aerobic involvement and the degree of aerobic training required for 400 metre athletes is open to debate.[1]

The current men's world record is held by Wayde van Niekerk of South Africa, with a time of 43.03 seconds; van Niekerk is also the Olympic champion. Steven Gardiner is the reigning World Champion. The world indoor record holder is Michael Norman, in 44.52 seconds. The current women's world record is held by Marita Koch, with a time of 47.60 seconds. Salwa Eid Naser is the reigning women's world champion, while Shaunae Miller holds the women's Olympic title. Jarmila Kratochvílová holds the world indoor record at 49.59 dating back to 1982. The men's T43 Paralympic world record of 45.07 seconds is held by Oscar Pistorius.[2]

An Olympic double of 200 metres and 400 m was first achieved by Valerie Brisco-Hooks in 1984, and later by Marie-José Pérec of France and Michael Johnson from the United States on the same evening in 1996. Alberto Juantorena of Cuba at the 1976 Summer Olympics became the first and so far the only athlete to win both the 400 m and 800 m Olympic titles. Pérec became the first to defend the Olympic title in 1996, Johnson became the first and only man to do so in 2000. From 31 appearances in the Olympic Games, the men's gold medallist came from the US 19 times.

Other Languages
العربية: 400 متر
aragonés: 400 metros lisos
български: 400 метра бягане
español: 400 metros
فارسی: دو ۴۰۰ متر
français: 400 mètres
hrvatski: Utrka na 400 m
italiano: 400 metri piani
latviešu: 400 metri
Bahasa Melayu: Lari 400 meter
norsk: 400 meter
ਪੰਜਾਬੀ: 400 ਮੀਟਰ ਦੌੜ
português: 400 metros rasos
slovenčina: Beh na 400 metrov
српски / srpski: Трка на 400 метара
Türkçe: 400 metre
українська: Біг на 400 метрів
中文: 400米赛跑