The decathlon is a combined event in athletics consisting of ten track and field events. The word "decathlon" was formed, in analogy to the word "pentathlon", from Greek δέκα and ἄθλος. Events are held over two consecutive days and the winners are determined by the combined performance in all. Performance is judged on a points system in each event, not by the position achieved. The decathlon is contested mainly by male athletes, while female athletes typically compete in the heptathlon.
The 400 metres hurdles is a track and field hurdling event. The event has been on the Olympic athletics programme since 1900 for men and since 1984 for women.
The 400 metres, or 400-metre dash, is an endurance race 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.
Allyson Michelle Felix is an American track and field athlete, who specialized in the 200 meters sprint from 2003 to 2013 and then gradually shifted to the 400 meters sprint later in her career. Her racing repertoire also spans the 100 meters, 4 × 100 meters relay, and 4 × 400 meters relay. At 200 meters, Felix is the 2012 Olympic champion, a three-time world champion (2005–2009), a two-time Olympic silver medalist, and the 2011 world bronze medalist. At 400 meters, she is the 2015 world champion, 2011 world silver medalist, 2016 Olympic silver medalist, 2017 world bronze medalist, and 2020 Olympic bronze medalist. Across the short distances, Felix is a ten-time U.S. national champion.
Arthur Godfrey Kilner Brown was a British athlete, winner of a gold medal in the 4 × 400 m relay at the 1936 Summer Olympics. He later became Headmaster of the Royal Grammar School Worcester, a post which he held from 1950 until his retirement in 1978.
Alvin Leonardo Harrison is an American former track and field athlete who competed in sprinting events. He won a gold medal in the 4 x 400 metres relay at both the 1996 and 2000 Summer Olympics and a silver medal in the 400 metres at the 2000 Summer Olympics.
Sandra Glover is an American former track and field athlete who competed in the 400-meter hurdles. She was a medalist in that event at the World Championships in Athletics in 2003 (silver) and 2005 (bronze). She also represented her country at the 2000 Summer Olympics. She was the national champion at the USA Outdoor Track and Field Championships for four consecutive years from 1999 to 2002. She had five victories on the IAAF Golden League circuit during her career.
Troy Douglas is a former Dutch sprinter. Originally competing for Bermuda, he finished second at the 1995 IAAF World Indoor Championships in the 200 metres event, but he changed nationality to the Netherlands in 1998. For Bermuda he participated at the 1988, 1992 and 1996 Summer Olympics, reaching the semi finals on the 200 metres in 1996 as well as the semi finals on the 400 metres in 1992 and 1996. He finished 5th in the final of the 200 metres at the 1991 Pan American Games.
Maeve Esther Enid Kyle, OBE, née Shankey, is an Irish Olympic athlete and hockey player. She was born in County Kilkenny. She competed in the 100m and 200m in the Melbourne Olympics and subsequently in the Rome Olympics and Tokyo Olympics. She took bronze in the 400m at the 1966 European Indoor Athletics Championships in Dortmund. She won four gold medalsa in W45 Category in World Masters Championship in Gothenburg in the 100m, 400m, high jump and long jump. She held World Masters records at W40 for the 100m and 400m and W45 100m and W50 long jump at 5.04m.
Vera Ivanovna Popkova was a Soviet track and field athlete who competed in the sprints. She had personal bests of 11.3 seconds for the 100 metres and 23.0 seconds for the 200 metres. Over her career, she won eight individual national titles in the sprints.
The British Virgin Islands have attended all seven Commonwealth Games since 1990.
The 300 metres is an uncommon sprinting event in track and field competitions.
Botswana made its Paralympic Games début at the 2004 Summer Paralympics in Athens. The country sent a single representative to compete in athletics. She set a world record and won a gold medal in the T46 women's 400m.
Fred Sowerby is a track and field athlete from Antigua and Barbuda, known primarily for running the 400 metres.
Marie Gayot is a retired French sprint athlete. She specialized in 400m and set her personal best of 50.97s in 2015 World Championships in Athletics in Beijing. She holds a master's degree in urbanism from Cergy-Pontoise University.
Noel Stanley Clough is an Australian former track and field athlete who competed in the 400 metres, 800 metres, and 400 metres hurdles.
The men's 400 metres hurdles at the 2018 Commonwealth Games, as part of the athletics programme, took place in the Carrara Stadium on 10 and 12 April 2018.
2005 World Masters Athletics Championships is the sixteenth in a series of World Masters Athletics Outdoor Championships that took place in San Sebastián, Spain from 22 August to 3 September 2005.
1979 World Masters Athletics Championships is the third in a series of World Masters Athletics Outdoor Championships that took place in Hannover, Germany, from 27 July to 2 August 1979.
Anna Cockrell is an American track and field athlete competing in sprinting and hurdling. She is a two-time medalist at the 2019 Pan American Games in Lima, Peru and she represented the United States at the 2020 Summer Olympics in Tokyo, Japan.
Bahamas 
Dominican Republic 
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South Africa