Normally, the active person takes a doping test in order for the record to be approved.

With the development of the shoes, where the marathon runners' shoes have been discussed for a long time, Warholm's shoes will now be sent to Stockholm for analysis in a laboratory before the international athletics federation approves the record. 78 from the 1992 Olympic final in Barcelona.

- They have tested and approved the shoe before, so I do not understand what would make them not approved.

It would be an extreme surprise, says Warholm's coach Leif Olav Alnes to NRK before the procedure that awaits.

- There has been so much talk about shoes, so it's amazing that they do this procedure.

I think it is wise, says coach Alnes.

Warholm quickly took off his shoes and walked around barefoot on Bislett's courts and stands.

- These are very good shoes, Warholm confirms.

Benjamin also ran in super shoes

Benjamin ran the new technology sole in his fast race last week at the American Championships in Eugene, Oregon.

His 46.83 was then second through the ages behind Kevin Young.

Karsten Warholm set a world record in the 400 meter hurdles with 46.70 at the Diamond League gala at Bislett last night.

Last week, American Rai Benjamin ran 46.83.

There will be a super duel at the Olympics in Tokyo in a month.

"It may take a new world record to win the Olympics," Warholm told Reuters.

Warholm's next competition is Monaco's DL gala on July 9, which will be his last before the Olympics, which will be inaugurated on July 23.

The 400 m hurdles trials begin on July 30.

"It takes the course of one's life to win the Olympics"

- What a fantastic race and I enjoyed it.

At the moment I have the Olympic record.

The one who will win in Tokyo, either Rai or Karsten, will have to make the course of his life, says the former world record holder Kevin Young who was ahead of his time according to the Diamond League's website.

400 m hurdles was for a long time the branch that did not really count and for a while was in the danger zone when the Diamond League cleared the offer a couple of years ago.

After Sydney McLaughlin set a world record for women with 51.90 in Monday morning Swedish time, two world records have now been set in less than four days, which has made the branch hot.

- The branch was far down in the program but something happened two, three years ago, says Bislettgala's competition leader Steinar Hoen to VG.

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See Warholm's world record in the 400 m hurdles Photo: Bildbyrån