Steroid doping tests ignore vital ethnic differences, say scientists

March 12th, 2009 - 12:16 pm ICT by ANI  

Washington, Mar 12 (ANI): A new study has suggested that steroid doping tests currently used in international sport are ”not fit for purpose” because they ignore vital ethnic differences in hormone activity.
According to the World Anti-Doping Agency, testosterones, and other hormones that boost testosterone levels, are commonly used as illicit performance enhancers in a number of sports.
Evidence of abuse is determined by the testosterone: epitestosterone ratio, or T:E ratio for short, in the urine. The threshold is set at above four for everyone, and confirmed by chemical analysis (gas chromatography).
To highlight the inadequacy of the current test, a team of Swiss researchers tested the steroid profiles of football players of different ethnicities, after they had deliberately added steroid to their urine samples.
They used gas chromatography, and took account of a variation (polymorphism) in the UGT2B17 gene.
Previous study has indicated that variations in this gene account for some of the differences in the urinary T:E ratio between men of white and Asian ethnic backgrounds. The gene affects metabolism, and therefore the rate at which testosterone is passed out of the body into the urine.
They included 57 men of Black African origin; 32 of Asian origin; 32 of Hispanic origin; and 50 of white (Caucasian) origin in their research. All the men were aged between 18 and 36.
The results revealed the genetic variation in almost one in four (22 percent) of the African footballers; in eight out 10 (81 percent) of the Asian players; one in 10 of the white men, and in 7 percent of the Hispanic players.
Based on these findings, the Swiss researchers ”recalibrated” the thresholds for each ethnic group.
The new T:E ratios were: 5.6 for men of African origin; 5.7 for white men, and 5.8 for men of Hispanic origin. For men of Asian origin, the ratio was 3.8.
The researchers concluded that a single indiscriminate threshold to pick up steroid abuse in international sport is “not fit for purpose.”
The suggested, instead, the reference ranges should be tailored to an athlete’’s individual endocrinological (hormonal) passport.
“[Such a] passport may detect modifications induced by abuse of testosterone and its precursors, but also alterations in the steroid profile caused by indirect androgen doping products,” they added.
The research has been published in the British Journal of Sports Medicine. (ANI)

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