OXFORD City triple jumper Nathan Douglas is calling for clarity on the extent of leaked doping files that shook athletics this week.

His comments came as the IAAF, the sport's governing body, denied allegations that officials turned a blind eye to suspicious blood tests involving hundreds of athletes.

German broadcaster ARD/WDR and the Sunday Times gained access to a database containing more than 12,000 blood tests from 5,000 athletes.

It claimed more than 800 athletes – and a third of all medallists in endurance events at recent Olympics and World Championships – had suspicious blood test results which were not followed up by the IAAF.

Two anti-doping experts said the blood test results were “highly suggestive of doping or at the very least abnormal”.

Douglas, who says he has never missed a drugs test, is asking for clarity on ‘abnormal’ results.

He said: “I can’t believe it, but at the same time it is just allegations.

“With blood tests I want them to define what is abnormal and, why has something not been done about it, if they are true?”

In a statement, the IAAF said it “categorically refutes all allegations made by ARD and The Sunday Times”.