Parkrun has stopped showing times for its fastest finishers after trans-women held female records.
Local organisers received emails from Parkrun bosses warning it will no longer publish records on first-place finishers and age-grade records.
Historic data outlining the identity of the fastest male and female athlete to complete each 5km course has already been hidden from view for participants.
Thousands of athletes participate in the free Parkrun event across the UK every Saturday morning.
Runners take part in the 5km parkrun at Victoria Park in east Belfast
However, organisers have come under fire for controversially allowing biological men to self-identify as females.
Former Olympic swimmer Sharron Davies described Parkrun as “cowardly”.
She instead claimed the organisation should add course records for trans athletes alongside the existing male and female records.
Davies said: “Rather than give females their fair sports results from Parkrun … they have removed from public view all records.
“The vast majority want simple, fair sport for all based on the biological reality of the bodies we run / race / compete with.
“The feelings of all females should never matter less than the feelings of a few trans-identifying males.”
She added on social media: ‘Keep sport fair for both sexes!’
Mara Yamauchi, a former British Olympic runner, also slammed the organisers.
She wrote on Twitter: “It will be interesting to see how Parkrunners react to all this data disappearing. I predict that a lot of men will be fed up about it.
“If males continue participating in [females] category (at least one did last Sat), I will continue speaking up.”
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