American media reports are shedding more light on a significant doping case at the Beijing Olympics.

They suggest the test sample that Russian figure skater Kamila Valieva provided before the Games contained three drugs.

The 15-year-old finished first in the women's short program on Tuesday, despite the controversy. It was her first competition since it was revealed that she had tested positive for a banned substance.

A New York Times report included details from a document filed in her arbitration hearing.

It said her sample included three medications that can be used to treat heart conditions.

The report said that two are not on the banned list, and Valieva previously disclosed that she had taken them.

The report cited the head of the US Anti-Doping Agency as saying the combination of substances "seem to be aimed at increasing endurance, reducing fatigue and promoting greater efficiency in using oxygen."

The International Olympic Committee said Valieva claims a mix-up with medication her grandfather had taken caused the positive test.

The skater will aim for gold in the women's free skating on Thursday.

The IOC says it will withhold medals if Valieva finishes in the top three, because the doping case is still unresolved.