Kamila Valieva's doping test still remains a mystery to all

Kamila Valieva's doping test revealed the presence of three substances to improve the heart function, the US Anti-Doping Agency (USADA) said. According to The New York Times, these drugs can be aimed at increasing endurance, if used in combination. According to USADA's chief Travis Tygart, Kamila Valieva's doping test revealed the presence of trimetazidine, L-carnitine and hypoxen. Of these three drugs, it is only trimetazidine that is included in the list of drugs prohibited for athletes. "It's a trifecta of substances — two of which are allowed, and one that is not allowed. The benefits of such a combination "seem to be aimed at increasing endurance, reducing fatigue and promoting greater efficiency in using oxygen," Travis Tygart said.