China's record-breaking swimming sensation Ye Shiwen has hit back at doping allegations in the wake of her incredible performances at the London Games.

The 16-year-old produced a quite remarkable swim to win the 400m individual medley, smashing the world record by over a second - and her personal best by over five seconds.

She swam a final freestyle leg that was quicker than US winner Ryan Lochte and Michael Phelps in the men's race.

Ye herself insists the team have nothing to hide, saying: "The Chinese team keep very firmly to the anti-doping policies, so there is absolutely no problem." 

"My results come from hard work and training and I would never use any banned drugs. The Chinese people have clean hands."  

Speaking to the BBC, Arne Ljungqvist, medical commission chairman for the International Olympic Committee, called the speculation sad. "To raise suspicion immediately when you see an extraordinary performance is against the fascination of sport," he said.