Usain Bolt - ap

BEIJING, China, (CMC)

Jamaican Olympic hero Usain Bolt is not surprised by the number of raised eyebrows following his performances at the Beijing Olympics, but said he has nothing thing to worry about because he is clean.

Bolt turned the Games upside down with his three gallant performances, winning gold in the 100 metres and 200 metres in World record times. The sprinter then ran the third leg of the sprint relay as Jamaica also captured gold in World record time.

Bolt, said he had been tested numerous times this season with all the results returning negative. Prior to the start of the games Bolt's compatriot Asafa Powell, had raised an issue with the amount of times that some of the Jamaican athletes had been tested.

"We've been tested a lot. I was tested four times before I even started running," Bolt said, while speaking at an event put on by his sponsors Puma.

"I have taken urine tests and blood tests. I have been tested after every competition," he added.

Outstanding performances

He continued: "I have been tested so many times I lost track. And we're okay with it.

"We work hard and we perform well and we know we're clean. Anytime they want to test us is okay with us," he said.

Bolt took the Olympics by storm, speeding to 9.69 seconds in winning the 100 metres before returning to clock a sensational 19.30 seconds to break American Michael Johnson's 12-year old 200m record and become the first double Olympic sprint champion in 24 years.

However, in recent times and perhaps with good reason, outstanding performances on the track have been greeted with some amount of scepticism. In October of last year United States sprint star Marion Jones, a winner of five medals at the 2000 Summer Olympics in Sydney, admitted to using performance enhancing drugs. The sprinter has since been stripped of the medals. In 2006 another 100m sprinter Justin Gatlin, then a major rival of Powell, also tested for performance enhancing drugs. Former 100m World record holder Tim Montgomery was banned from the sport. Since the end of the Games in Beijing, six athletes have already been tested positive for banned substances.