Imagine training for months, giving everything you've got — and then finding out another rider beat you not because they were faster, but because they took a pill. That's exactly what researchers at the University of Kent in the UK have been working to prevent.
Professor Lex Mauger, a scientist who studies how the human body performs under pressure, led a team that discovered a common narcotic painkiller called tapentadol can make cyclists ride faster. In a study commissioned by the World Anti-Doping Agency (WADA) — the organization that decides which substances are fair game in sports — Mauger's team found that tapentadol improved cycling performance by 1.72%.
That might sound small. But in a race, that difference could be the gap between gold and silver.
"This high-quality, randomized controlled study on highly trained, nonprofessional cyclists showed that tapentadol substantially reduces the pain associated with intense exercise and could be one of the reasons why it enhances performance," Mauger said.
The research started because WADA already knew another painkiller, tramadol, boosted athletic performance. Tramadol was added to WADA's prohibited list in 2024 after Mauger's earlier study proved its effects. Now, tapentadol appears to work in a similar way — dulling the pain that builds up during hard exercise, so athletes can push through longer and faster.
To test this, researchers used 3D motion-capture cameras pointed at markers on bicycles. These cameras tracked exactly how much the bikes wobbled side to side as riders pedaled, helping the scientists understand whether tapentadol affected balance or motor control. The results suggested it didn't — but it still gave riders an edge.
Mauger and his team urge caution, though. Tapentadol belongs to a family of drugs called narcotics, which are highly addictive and carry real risks. Even though the cyclists in the study didn't report major side effects, the researchers say the potential for harm means tapentadol should probably be banned in competitive sports.
"Given that it could change the outcomes of a race, a prohibition on its use in sport in certain conditions should be considered," Mauger said.
For athletes who train honestly and fans who want to see公平的竞争, the findings are good news: science is getting better at spotting substances that give some riders an unfair advantage — and closing those loopholes before they change who crosses the finish line first.