The 400 metres, or 400-meter dash, is a sprint 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.
Sex verification in sports occurs because eligibility of athletes to compete is restricted whenever sporting events are limited to a single sex, which is generally the case, as well as when events are limited to mixed-sex teams of defined composition. Practice has varied tremendously over time, across borders and by competitive level. Issues have arisen multiple times in the Olympic games and other high-profile sporting competitions, for example allegations that certain male athletes attempted to compete as women or that certain female athletes had intersex conditions perceived to give unfair advantage. The topic of sex verification is related to the more recent question of how to treat transgender people in sports. Sex verification is not typically conducted on athletes competing in the male category because there is generally no perceived competitive advantage for a female or intersex athlete to compete in male categories.
Janeth Jepkosgei Busienei is a Kenyan middle distance runner and former world champion.
The principal sports in Namibia are football, rugby union, cricket, golf and fishing. Boxing and athletics are also popular. The home stadium for all national teams is Independence Stadium in Windhoek, while Sam Nujoma Stadium in Katutura is also occasionally used.
Jennifer Brenda "Jenny" Meadows is a retired British athlete. Her main event was the 800 metres, although she previously competed also over the 400 metres. She won the bronze medal at the 2009 World Championships, and a silver at the 2010 World Indoor Championships. At the European Athletics Championships, Meadows took silver outdoors in 2010 and gold indoors in 2011. She also had some international success as part of the Great Britain women's 4 x 400 metres relay squad.
Mokgadi Caster Semenya OIB is a South African middle-distance runner and winner of two Olympic gold medals and three World Championships in the women's 800 metres. She first won gold at the World Championships in 2009 and went on to win at the 2016 Olympics and the 2017 World Championships, where she also won a bronze medal in the 1500 metres. After the doping disqualification of Mariya Savinova, she was also awarded gold medals for the 2011 World Championships and the 2012 Olympics.
Lynsey Sharp is a former Scottish track and field athlete who competed in the 800 metres. She is the 2012 European champion and represented Great Britain at the 2012 Olympic Games in London. She won a silver medal at the 2014 Commonwealth Games. Her personal best is 1:57.69, the seventh fastest time over 800m by a British woman, set in the final of the 2016 Olympic Games in Rio de Janeiro.
Melissa Bishop-Nriagu is a Canadian runner who specializes in the 800 metres. She competed at the 2012, 2016 Olympics and 2020 Olympics. She won a silver medal at the 2015 World Athletics Championships. Her World Championship medal was a Canadian woman's first-ever medal in the 800 m. Bishop-Nriagu graduated from University of Windsor and was only the third Canadian woman to achieve a time under 2:00 minutes in the 800 m. She is currently the national record holder for this distance.
Francine Niyonsaba is a Burundian runner who specialized in the 800 metres and shifted to longer distances in 2019. She was the 2016 Rio Olympics silver medalist in the women's 800 metres. Her silver medal was the first Olympic medal for Burundi since 1996. Niyonsaba won a silver in the event at the 2017 World Championships.
Faith Chepngetich Kipyegon is a Kenyan middle- and long-distance runner. Kipyegon is the current world record holder for the 1,500 metres and mile, and the former world record holder for the 5,000 metres. Kipyegon is the only three-time Olympic champion in the 1500 metres race, having won a gold medal each at the 2016 Rio de Janeiro Olympics, 2020 Tokyo Olympics and the 2024 Paris Olympics. She also won a gold medal in the 1,500 m at the 2017, 2022 and 2023 World Athletics Championships and in the 5,000 m at the 2023 World Athletics Championships. At the 2024 Paris Olympics, Kipyegon became the first athlete ever to win three consecutive gold medals in the 1500m women's race, where she also set a new Olympic record. Kipyegon had earlier on in the 2024 Paris Olympics also earned a silver medal in the women's 5000m race, an event marked by controversy. Initially disqualified for obstruction, Kipyegon's second-place finish was later reinstated. Beatrice Chebet edged her out to win the gold.
Dalilah Muhammad is an American track and field athlete who specializes in the 400 meters hurdles. She is the 2016 Rio Olympics champion and 2020 Tokyo Olympics silver medalist, becoming at the latter the then-second-fastest woman of all time in the event with her personal best of 51.58 seconds. Muhammad was second at both the 2013 and 2017 World Championships to take her first gold in 2019, setting the former world record of 52.16 s. She was the second female 400 m hurdler in history, after Sally Gunnell, to have won the Olympic, World titles and broken the world record. At both the 2019 World Championships and Tokyo Games, she also took gold as part of women's 4 × 400 metres relay team.
Dutee Chand is an Indian professional sprinter and current national champion in the women's 100 metres event. In 2013, Chand was the first Indian sprinter to reach the final of the 100m event at a global youth athletics competition, and in 2016 she took part in the Rio Olympic Games. She is the third Indian woman to ever qualify for the Women's 100 metres event at the Summer Olympic Games. In 2018, Chand clinched silver in women's 100m at the Jakarta Asian Games. It was India's first medal in this event since 1998. Moreover, In 2019, she became the first Indian sprinter to win gold at the Universiade, clocking 11.32 seconds in the 100 m race.
The women's 800 metres event at the 2016 Summer Olympics took place between 17–20 August at the Olympic Stadium.
Oluwatobiloba Ayomide "Tobi" Amusan is a Nigerian track and field athlete who specialises in the 100 metres hurdles and also competes as a sprinter. Amusan is the current world record holder in the 100 metres hurdles with a time of 12.12 seconds which she set at the 2022 women's 100 metres hurdles semi-final in Eugene, Oregon. She is the current Commonwealth and African champion in the 100 m hurdles, as well as the meet record holder in those two competitions. Amusan became the first ever Nigerian world champion and world record holder in an athletics event when she won the 2022 World Championships 100 m hurdles gold medal, setting the current world record of 12.12 seconds (+0.9 m/s) in the semi-final, followed up by a 12.06 seconds (+2.5 m/s) in the final. She won back-to-back Commonwealth and African titles in 2018 and 2022 in the 100 m hurdles and is also a two-time African Games champion. She is also the current Diamond league champion in the 100 metres hurdles having won the final in 12.33 seconds (+1.8 m/s) achieving a winning streak in 2021, 2022 and 2023.
Sydney Michelle McLaughlin-Levrone is an American hurdler and sprinter who competes in the 400 meters hurdles and is the world record holder in that event. She has won gold in the 2020 and 2024 Summer Olympics, as well as the 2022 World Athletics Championships. She set a world record time of 50.37 seconds at the 2024 Summer Olympics on August 8, 2024, breaking her own old world record of 50.65 seconds. She is the first track athlete to break four world records in the same event; setting four world records during 13 months, she was the first woman to break the 52-second and 51-second barriers in the 400 m hurdles. She won the silver medal at the 2019 World Championships. At all four competitions, she also took gold as part of a women's 4 × 400 m relay team.
The women's 200 metres event at the 2020 Summer Olympics took place on 2 and 3 August 2021 at the Japan National Stadium. 41 athletes from 31 nations competed. In successfully defending her title, Elaine Thompson-Herah became the first woman in history to win both the 100 and 200 metres titles at successive games. Her winning time of 21.53 secs, moved her to second on the world all-time list behind Florence Griffith Joyner, and broke Merlene Ottey's 30-year-old Jamaican record. The winning margin was 0.28 seconds. Surprisingly, Thompson-Herah had the slowest reaction time in the final.
The women's 400 metres event at the 2020 Summer Olympics took place from 3 to 6 August 2021 at the Japan National Stadium. 45 athletes from 34 nations competed. Shaunae Miller-Uibo won the gold medal by 0.84 seconds in a personal best of 48.36 secs, a time which ranks her sixth on the world all-time list. In successfully defending her title, Miller-Uibo joined Marie-Jose Perec as the only women to win two Olympic 400 metres titles.
The testosterone regulations in women's athletics are a series of policies first published in 2011 by the IAAF and last updated following a court victory against the athlete Caster Semenya in May 2019. The first version of the rules applied to all women with high testosterone, but the current version of the rules only apply to athletes with certain XY disorders of sexual development, and set a 5 nmol/L testosterone limit, which applies only to distances between 400 m and 1 mile (inclusive), other events being unrestricted.
Beatrice Masilingi is a Namibian sprinter. At the age of 18, she placed sixth in the 200 metres at the 2020 Tokyo Olympics, having made the final along with fellow Namibian sprinter and eventual silver medallist Christine Mboma. Masilingi won silver medals in both the 100 metres and 200 m at the 2021 World Under-20 Championships.
The Olympic Games mandates sex verification of athletes in women's competitions, and has done since the 1930s. In this time, there have been many different regulations for sex testing, as well as different types of tests used. Initial concerns that prompted the approval of suspicion-based sex testing were of national teams exploiting intersex athletes for Olympic success, and testing first became a requirement in the 1960s when many female athletes were doped and it was harder to tell physical differences between them and men.
