A medical study of Dutch doctor Douwe de Boer, considered the world's leading authority on the analysis of clenbuterol, supports the innocence of Spanish cyclist Alberto Contador, winner of three Tour de France, for its possible positive for the substance in last year's Tour . http://thecyclingsideoftheforce.blogspot.com/
In this report, the doctor, a graduate in biochemistry from the University of Groningen, emphasizes that the "principal use" of the substance is "for the treatment of asthma" and says it also is often applied, sometimes "high dose" in cattle "for growth." "Its misuse can cause poisoning in those who consume it," he says, noting that "several reports" confirm the existence of these poisonings.
Regarding the case of the triple Tour de France, the Dutch doctor reveals that between "19 and July 20, the checks did not indicate any clenbuterol, that" found on 21 is very low, equivalent to 0.05 ng / mL "and that on 22" was even lower, estimated at 0.02 ng / mL. " De Boer said that the average life of the substance is between "25 and 39 hours." Estimates based on pharmacology, said, "assuming an average of 24 hours, the maximum concentration would have been 0.1 ng / mL, 32 hours if, in" 0.09 ng / mL "and if 40 hours' 0.08 ng / mL. " "These maximum concentrations are below the 0.9ng/mL. Consequently, if an accidental ingestion of small amounts occurred directly after the control July 20, should be undetectable to Alberto Contador," he continues.
Thus, the biochemist it seemed "clear" that the Spanish rider "meat consumed in Spain" after the 20 day control. "Knowing the history of the poisoning by clenbuterol in Spain and now the substance can be detected in extremely low amounts, it is obvious that this particular case, the scenario of an accidental intake by consumption of meat is most likely" he adds.
Finally, as conclusions, the Dutch physician indicates that the concentration of clenbuterol in urine Accountant "is extremely low," "extremely likely and would be just looking at the case from a scene of accidental consumption of meat consumption" and than WADA's accredited laboratories should not report amounts of the substance "under 10 percent of MRPL (an analytical parameter) of 2 ng / mL. to have a fair and reasonable concentration for an adverse outcome."