Cortisol concentrations in post competition horse urine: a French and British survey.

The research study explores the concentrations of cortisol, a hormone often used as a doping agent, in post-competition horse urine samples. It concludes that the current international threshold for declaring a horse as doped is robust and reliable.

Objectives and Methodology

• The research aimed to estimate the parameters of cortisol concentrations in post-competition horse urine samples. This hormone is often used as a doping agent in sports, and an international threshold for its levels exists for fair conduct.
• The researchers used two data sets: one from France with 112 samples and another from the UK with 142 samples.
• Urine samples were collected under specific post-competition conditions to ensure comparable and accurate results.
• The cortisol concentrations were measured using validated methods – High-Performance Liquid Chromatography (HPLC) for the French samples, and Gas Chromatography-Mass Spectrometry (GC-MS) for the UK samples.

Results and Analysis

• The study found no significant difference between the two data sets, which allowed the researchers to merge them for statistical analysis.
• The geometric mean cortisol concentration across all samples was observed as 48 ng/ml.
• The data followed a non-Gaussian distribution, but a log-normal distribution was accepted assuming a significance level higher than 0.05.
• Utilizing this log-normal distribution, the probability of a horse urine sample exceeding the set cortisol concentration threshold of 1.0 micrograms/ml was calculated to be 1.1 x 10(-4).

Conclusion

• The study concludes that the established international threshold for cortisol detection in horse urine is highly specific. In other words, it carries a low risk of falsely marking a horse as medicated or ‘doped’ when it’s not.
• Therefore, the findings support the effectiveness of the current doping control standards and hold implications for the integrity of horse sports competitions.