The IOC's anti-doping chief played down suspicions over Chinese swimmer Ye Shiwen’s dominating performance during the London Olympics.

Ye Shiwen,16, took the gold medal and set a new world record with a time of 4 minutes 28.43 seconds in the women's 400m individual medley on Saturday.

"I think it is very sad that an unexpected performance be surrounded by suspicions," said Arne Ljungqvist at a news conference Monday, "I think that is very bad for the sport itself. I think we should applaud until we have a reason to do it. I don't like suspicions."

Ye appeared confident in her performance, “The Chinese team has always had a firm policy about anti-doping," Ye said.