Steroid doping tests ignore vital ethnic differences in hormone activity

Out of the blocksCurrent steroid (testosterone) doping tests should be scrapped for international sport because they ignore vital ethnic differences in hormone activity, suggests research published ahead of print in the British Journal of Sports Medicine.

Testosterone and other hormones that boost testosterone levels, such as growth hormone, are among the most widely abused performance enhancers used in sport, according to the World Anti-Doping Agency.

Evidence of steroid (testosterone) abuse is determined by the testosterone: epitestosterone ratio, or T:E ratio for short, in the urine. The threshold is currently set at above four for everyone and any reading above this is considered suspicious.

To highlight the inadequacy of the current test, the 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 which affects metabolism and therefore the rate at which testosterone is passed out of the body into the urine.

Previous research 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.

Included in the study were 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%) of the African footballers; in eight out 10 (81%) of the Asian players; one in 10 of the white men, and in 7% of the Hispanic players.

Based on these findings, the Swiss researchers “recalibrated” the thresholds for each ethnic group and found that 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 significantly lower at 3.8.

based on these findings the authors concluded that a single indiscriminate threshold to pick up steroid abuse in international sport is “not fit for purpose,”. Instead, the reference ranges should be tailored to an athlete’s individual endocrinological (hormonal) passport, they suggest.

“Such a passport may detect not just modifications induced by abuse of testosterone and its precursors, but also alterations in the steroid profile caused by indirect androgen doping products,” they conclude.

Source: “Steroid profiles of professional soccer players: an international comparative study” British Medical Journal

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