BEIJING, July 30 (Xinhua) -- A new testing method has been in place to check previously undetectable human growth hormone (HGH) during the Beijing Olympic Games.

"The new test kits will track the use of HGH, a substance that boosts strength and speeds recovery, beyond 48 hours," said Wu Moutian, deputy director of the Chinese Anti-doping Agency, on Wednesday.

Wu, however, declined to disclose the details of the method.

The Olympic doping testing period began from July 27 and will run until the Games end.

A total of 4,500 doping controls, including 900 blood tests, are planned in Beijing, about 25 percent rise on Athens.

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