Lithium Concentration in Biological Samples and Gender Difference in Athletic Horses.

The research examines the differences in lithium concentration in various biological samples (blood, serum, mane, and tail) among athletic horses by gender. The study finds correlations between lithium levels and certain hematological parameters (e.g., different types of blood cells and hemoglobin levels), and the findings may help assess lithium bioaccumulation for doping control in equine sports.

Study Objectives and Methods

• The primary goal of this study was to determine variations in lithium concentrations across different biological substrates in horses, with a focus on gender-based differences.
• The researchers looked at geldings (castrated male horses) and mares (female horses), gathering samples of blood, serum, mane, and tail from a total of 30 horses.
• The hematological parameters used as blood biomarkers for lithium bioaccumulation included red and white blood cell counts, hemoglobin (HGB), hematocrit (HCT), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), and mean corpuscular hemoglobin concentration (MCHC).
• The lithium concentrations in these substrates were analyzed using one-way ANOVA (analysis of variance), while comparisons between geldings and mares were made using an unpaired t-test.
• Further, Pearson’s regression analysis was conducted to assess correlations between lithium concentrations across different substrates and between substrates and the hematological parameters.

Key Findings of the Study

• The findings revealed higher values of lithium concentration in the blood and mane samples in general, with the mares showing higher lithium levels in mane and tail samples compared to geldings.
• The correlation analysis revealed a significant relationship only among the lithium concentrations in blood, serum, and tail samples.
• Additionally, a significant statistical correlation was found between blood lithium levels and all measured hematological parameters, with the exception of white blood cells (WBC) and mean corpuscular hemoglobin (MCH).
• Correlations were also found between serum lithium concentration and red blood cells (RBC), hemoglobin (HGB), and hematocrit (HCT) as well as between tail lithium concentration and HGB, HCT, and MCH.
• However, there was no significant relationship observed between mane lithium levels and hematological parameters.

Implications of the Study

• The results of this study provide valuable insights into lithium bioaccumulation in athletic horses, which can help in doping control in horse sports due to lithium’s neurotrophic effect and potential use as a doping substance.
• The research uncovers differences in lithium concentration based on gender and biological substrate, which could be essential for future investigations in equine physiology and doping control.