Antonina Yefremova (born 19 July 1981) is a Ukrainian sprinter who specializes in the

400 metres 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 ...

. Yefremova received a two-year ban in 2012 for using

testosterone Testosterone is the primary male sex hormone and androgen in Male, males. In humans, testosterone plays a key role in the development of Male reproductive system, male reproductive tissues such as testicles and prostate, as well as promoting se ...

at the 2011 World Athletics Championships. She won the gold medal at the 2001 European U23 Championships, finished sixth at the 2002 European Championships and fourth at the 2008 World Indoor Championships. She reached the semi-final at the 2000 World Junior Championships, the 2003 World Championships and the

2004 Olympic Games The 2004 Summer Olympics (), officially the Games of the XXVIII Olympiad (), and officially branded as Athens 2004 (), were an international multi-sport event held from 13 to 29 August 2004 in Athens, Greece. The Games saw 10,625 athletes ...

, and competed at the 2003 World Indoor Championships, the 2005 World Championships, the

2008 Olympic Games The 2008 Summer Olympics (), officially the Games of the XXIX Olympiad () and officially branded as Beijing 2008 (), were an international multisport event held from 8 to 24 August 2008, in Beijing, China. A total of 10,942 athletes fr ...

and the 2010 World Indoor Championships without progressing from the first round. In the

4 x 400 metres relay 4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. Evolution of the Hi ...

she finished fifth at the

2002 World Cup The 2002 FIFA World Cup, also branded as Korea/Japan 2002, was the 17th FIFA World Cup, the quadrennial Association football, football world championship for List of men's national association football teams, men's national teams organized by ...

, fifth at the 2003 World Indoor Championships, fourth at the 2005 European Indoor Championships, fifth at the 2005 World Championships, won a bronze medal at the

2005 Summer Universiade The 2005 Summer Universiade, also known as the XXIII Summer Universiade, took place in İzmir, Turkey, in August. Emblem The emblem is the letter "U", inspired by the bird's-eye view of the Gulf of İzmir. This shape has perfectly fit the letter ...

, and won a gold medal at the

2007 Summer Universiade The 2007 Summer Universiade officially known as the XXIV Summer Universiade and commonly known as Bangkok Universiade, was an international multi-sport for university athletes that took place from 8 to 18 August 2007 in Bangkok, Thailand, with pr ...

. She also competed at the 2003 World Championships, the

, the 2007 World Championships, and the 2009 World Championships. Her personal best times are 50.70 seconds in the 400 metres, achieved in June 2002 in

Annecy Annecy ( , ; , also ) is the Prefectures in France, prefecture and List of communes in France with over 20,000 inhabitants, largest city of the Haute-Savoie Departments of France, department in the Auvergne-Rhône-Alpes Regions of France, regi ...

, and 24.35 in the 200 metres (indoor), achieved in February 2005 in

Sumy Sumy (, , ) is a city in northeastern Ukraine. It serves as the administrative center of Sumy Oblast. The city is situated on the banks of the Psel (river), Psel River and has a population of making it the 23rd-largest in the country. The city ...

. In 2011, she competed for Fenerbahçe Athletics in

Turkey Turkey, officially the Republic of Türkiye, is a country mainly located in Anatolia in West Asia, with a relatively small part called East Thrace in Southeast Europe. It borders the Black Sea to the north; Georgia (country), Georgia, Armen ...

. She failed a random drug test in June 2012 and was banned for two years.IAAF Newsletter No.135 (Jul/Aug)
IAAF (28 August 2012). Retrieved on 2012-09-02.

References

{{DEFAULTSORT:Yefremova, Antonina 1981 births Living people Ukrainian female sprinters Athletes (track and field) at the 2004 Summer Olympics Athletes (track and field) at the 2008 Summer Olympics Olympic athletes for Ukraine Fenerbahçe athletes Doping cases in athletics Ukrainian sportspeople in doping cases Universiade medalists in athletics (track and field) FISU World University Games gold medalists for Ukraine FISU World University Games bronze medalists for Ukraine Medalists at the 2005 Summer Universiade Medalists at the 2007 Summer Universiade Olympic female sprinters Ukrainian Athletics Championships winners 21st-century Ukrainian sportswomen