Dusseldorf  - German researchers have developed a test method for a possible new doping substance named S107, state network ARD reported on Saturday.

ARD said that a Cologne-based centre for preventative doping science developed the test method for the substance which is not yet listed as a doping substance by the World Anti-Doping Agency.

The centre's head Mario Thevis said that S107, originally developed in the United States to treat heart rhythm deviations, could be used by endurance athletes because it "significantly enhances performance." (dpa)