Dutch Doping Authorities provide more explanation on the Hessmann case: "It (diuretics) may mask and reduce the excretion of (doping) substances"
Cycling
Michel Hessmann was provisionally suspended on Wednesday due to a positive doping test on a diuretic. It is not known exactly which substance was found in the 22-year-old German, but the discovery is in any case reason to set off the doping alarm. A diuretic can mask doping use.
Urinary drugs, in a fancy word also called duretics, are prohibited in sports. "Diuretics, also known as diuretics, cause more urine production and a faster excretion of (doping) substances," the Dutch Doping Authority writes on its website. "Masks and reduces the excretion of (doping) substances. In addition, substances that increase the plasma volume of the blood belong to this category."
"Diuretics are drugs that stimulate the kidneys to make more urine. Not only is the production of urine accelerated, but the amount of urine is also increased. Diuretics are prescribed to treat high blood pressure and to reduce fluid retention in the body," said the Doping Authority: "Diuretics cause lower concentrations of doping substances in the urine. They can ensure that doping substances are removed from the body earlier."
Hessmann tested positive on June 14 in an out-of-competition check. These tests are taken at a place that athletes indicate themselves. They must pass on so-called whereabouts, in which time slot they are at which location, so that the doping inspectors can come and see them.
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Ondrej ZhasilCycling Journalist
Ondřej Zhasil is a cycling journalist at CyclingUpToDate and has been part of the team since 2023. He is based in Ostrava, the third-largest city in the Czech Republic, and covers professional cycling across the main UCI competitions, including the Tour de France, the Giro d’Italia, and La Vuelta a España. A key focus of his work is startlist analysis and pre-race coverage, where he examines team selections, rider line-ups, and tactical scenarios ahead of major events.
Alongside WorldTour coverage, Ondřej has developed specific expertise in junior cycling and in racing across East Asia, including competitions in China and Japan. He also maintains a broad working knowledge of other disciplines and levels, including cyclocross, while continuing to expand his understanding of mountain bike racing.
Ondřej holds a bachelor’s degree in Mathematics and Physics, which supports his analytical, data-driven approach to performance and race analysis. In his reporting, he regularly uses ProCyclingStats for results, statistics, and historical context. He places strong emphasis on careful sourcing, editorial accuracy, and updating articles promptly when new, verified information becomes available.
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- great analysis thanks! appreciate you posting this. I didn't realize CX had a different standard for deviation. this is even more egregious it seems.mij10-11-2026
- As he isn't currently with Red Bull, I guess if he want to race for one more year he needs to find a team. He's 37 so this will be his last year I would guess, unless he wants to race for almost nothing like Froome did.awp10-11-2026
- I think some are making much ado about nothing. Even though Jonas is getting older, before his crash in the Tour, he looked like a solid 2nd all the way home. No one can really climb with Tadej until this year, Eric Mas showed himself which I think was a one off year for him and Paul Seixas has been able to be pretty close to him. Whatever stage race Jonas enters as long as Tadej is not there he is a favorite to win.awp10-11-2026
- Giro or not Giro, he won't win the Tour!MajorPayne10-11-2026
- Very true.awp10-11-2026
- Ciccone had a very strong end of season. Consistently attacking and livening up races. Hope he makes that last leap in progress and starts notching some significant wins. Great rider to watch.Occam10-11-2026
- Me too!!!!!Occam10-11-2026
- they can sign any 100 of top riders today but Pogi will win over Remco any time at the TDF unless something goes wrongabstractengineer10-11-2026
- the time for a GC rider to retire is when they cannot win stages, or have a significant level drop like from winner/podium into top 5/10 consistently. Roglic is still competitive and Froome raced even though he became pack fodder.abstractengineer10-11-2026
- He should be in a different team. It was detrimental. For them it does not matter if he does not develop. He should have gone to a team where they need him to succeed.abstractengineer10-11-2026
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It concerned an out-of-competition control on 14 June in Germany. The detected product is a diuretic medicine. We await the results of further investigation. Michel has been suspended by the team until further notice.
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