The report, conducted by Professor Roger Pielke Jr of the University of Colorado and Professor Ross Tucker of the University of the Free State, was commissioned by Young’s sponsor SKINS.

It followed accusations from the running community that Young had cheated in his attempt, which began in May and was ended the following month when the Briton pulled out after 36 days, citing an injury.

SKINS has since terminated its sponsorship agreement with Young, according to chief executive Jaimie Fuller.

The 101-page report found that the cadence data on the two TomTom watches being used by the athlete was inconsistent with someone running.

It also claimed the assistance received by Young, who disputes the report’s findings, was "most likely in the form of riding in or on a vehicle for large parts of the attempt".

Suggestions of possible wrongdoing were first raised in a thread on the Let’s Run website by Asher Delmott, who had attempted to run alongside 33-year-old Young for a few miles.

Delmott failed to see Young running, however, when he drove up to the athlete’s support vehicle and claimed he had seen a "real-life account of realising this guy is faking it".

His post sparked further interest in whether Young was cheating during the run across the United States.

In a statement following the release of the report, Fuller admitted the sportswear company itself could have done better, claiming it had given them a "salutary lesson".

The actions of the company have been widely praised, however, particularly as the report was commissioned by Young’s sponsor.

"All of us at SKINS are extremely disappointed that it has come to this but we also want to remain consistent with our values of championing the true spirit of competition," Fuller said.

"The report also contains a salutary lesson for SKINS.

"We placed too many expectations on one staff member and under-estimated the work involved.

"In future, we will be much more mindful of what is needed to ensure that there is appropriate data gathering, monitoring and instant sharing in place and resource it appropriately.

"Like any sport, running is a passion for many people around the world and it’s critical to the integrity of running that record attempts such as the one by Rob Young are properly managed and transparent.

"I’m grateful to Roger Pielke and Ross Tucker for their comprehensive work and the clarity of their findings.

"I also appreciate the interest of the running community in the record attempt and the outcome of this investigation."

The current Trans America record is 46 days, eight hours, and 36 minutes, and was set by Frank Giannino Jr in 1980.

The full report can be read here.