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Study of cobalt doping control via various routes in thoroughbred horses.

Cobalt is a substance that has been abused for athletic performance enhancement and has thus been prohibited by human and animal sports doping control authorities. However, since cobalt is present in humans and animals as a trace element, a certain level of cobalt is naturally present in their excretions. In the racing industry, cobalt is a controlled substance with a threshold concentration specified by the International Agreement on Breeding and the Horse Racing and Wagering (IABRW) for international harmonization. Due to environmental and feed consumption differences among countries, regional cobalt concentration trends should be evaluated before cobalt testing is introduced. In this study, we conducted a preliminary evaluation of the urinary concentration of cobalt among a population of racehorses in Korea using inductively coupled plasma mass spectrometry (ICP-MS) analysis, followed by analysis of the urinary release of cobalt after the administration of cobalt chloride in various situations. The normal distribution for the Korea-based racehorses was used to determine a urine concentration limit (96.5 ng/mL, risk factor of 1 in 10000). After the intravenous (IV) administration of CoCl2 , the initial elimination of cobalt was rapid. A high concentration (over 2000 ng/mL) and a slow excretion pattern were observed during the final 2 weeks of the 3 weeks' observation period. When CoCl2 was administered orally, maximum concentration (Cmax , 92-992 ng/mL) was observed at 6-8 h.