Richard Freeman, a former doctor for Team Sky and British Cycling, was investigating the relationship between testosterone and endurance exercise, a medical court evaluating his fitness to practice revealed Wednesday.

According to the Times and Daily Mail, Freeman had downloaded academic papers onto his laptop, one on the effects of Viagra and another on the effects of endurance exercise on testosterone levels.

The paper on Viagra, a libido enhancer said to raise testosterone levels, was downloaded in April 2011, a month before Freeman ordered 30 bags of testosterone gel from British Cycling and Team Sky headquarters.

Testosterone is banned both in and out of competition, and this delivery is at the center of the courtroom with respect to all four of the 22 allegations Freeman is contesting.

Freeman, who previously denied ordering the test gel, is fighting charges that he "knew or believed" it could be used to dope athletes and instead claims it was intended to treat erectile dysfunction in former coach Shane Sutton. Sutton vehemently denied the charge before storming out of court last week.

The hearing resumed Wednesday, and the GMC called in Professor David Cowan, a leading anti-doping expert who was once the director of the WADA-accredited Drug Control Centre in London.

"He had shown a lot of knowledge and interest in the testosterone levels of riders," Professor Cowan said of the laptop documents seized by investigators.

"Certainly, there was concern expressed that certain cyclists had lower than normal testosterone levels, but there was no indication of a treatment for this other than rest."

"The investigators were also concerned that the rider's testosterone levels were lower than normal.

According to press reports, Freeman's lawyer, Mary O'Rourke QC, comments on the medical uses of testosterone before arguing that Freeman must have a solid knowledge of this hormone since it is a banned substance that is regularly tested for He questioned Cowan's ability to do so.

The trial continues Thursday.