Her current personal bests are 14.11 in the 100m achieved at Ostrava on 3 September 2005; 13.77 in the 100 metres hurdles at Stará Boleslav on 13 June 2003; 53.04 in the 400 m at Kladno on 28 June 2008; and 54.90 in the 400 m hurdles recorded at Monaco on 28 July 2009.
Career
2008
In early March 2008 Hejnová competed in the 400 metres at the 2008 IAAF World Indoor Championships and reached the semi-finals but did not qualify to reach the final. She did however, reach the final with the Czech relay team in the 4 × 400 metres relay in a team which included her, Zuzana Bergrová, Denisa Ščerbová, and Jitka Bartoničková. They finished 4th, with a time of 3:34.53, but were over 5 seconds slower than the Americans who took bronze with a time of 3:29.30.
Hejnová competed in the 400 metres hurdles at the 2008 Beijing Olympics. She qualified for the second round with the thirteenth fastest overall time of 55.91 seconds and for the final with 55.17. In the final she finished seventh with 54.97, only one hundredth behind her personal best at the time.
2011
She won the 400 metres hurdles at the European Team Championships with a new national record of 53.87 seconds.[3]
On 8 July 2011 she improved her national record to 53.29 seconds.[4]
In 2019, following a re-test of doping samples, Antyukh was disqualified with all her results 2013 onward deleted but her 2012 Olympic results were not affected.[5][6][7] In October 2022, Antyukh's results from 15 July 2012 on were retroactively voided. In December, it was announced that she had been stripped of her title and Demus would be upgraded to gold in her place, with Hejnová then second.[8]
2013
Hejnová won Diamond League races over 400 m Hurdles in Shanghai (53.79), Eugene (53.70), Oslo (53.60), Paris (53.23 NR), and London (53.07 NR). She also won races in Des Moines (54.41), Prague (54.55) and Ostrava (53.32). She secured maximum points for Czech Republic in the European Team Championships First League in Dublin by winning the 400 m in 51.90 seconds. On 15 August 2013 in Moscow, Hejnová became World Champion over 400 m hurdles with a new Czech record (52.83 NR).
She threatened to sue Czech Post for 1 million koruna over the use of her likeness on a stamp celebrating the 2016 Olympic Games.[11] The Court of Appeal found in favour of Hejnová, leading to Czech Post paying her an undisclosed settlement.[12]