Cardiac troponin I in pastured and race-training Thoroughbred horses.

The research conducted an analysis of cardiac troponin I, a biomarker of heart injury, in Thoroughbred horses undergoing two different lifestyle conditions: grazing and race-training. The study did not find a significant difference in the concentrations between the two groups, thereby setting an initial reference range for this biomarker in healthy horses of the Thoroughbred breed.

Objective of the Study

• This research was set out to determine the concentrations of cardiac troponin I (cTnI), a myocardial polypeptide, in two different lifestyle conditions of Thoroughbred horses—pasture-living and race-training. The protein is known for indicating heart tissue damage in humans and dogs.

Methodology

• The study involved twenty horses, with ten each from pasture and race-training backgrounds. These horses were deemed to be in normal condition based on various evaluations such as physical examination, training performance, electrocardiography (ECG), and echocardiography.
• A colorimetric immunoassay was employed in the research to determine serum cTnI concentrations, with the assay having analytical sensitivity of 0.04 ng/mL.

Findings

• The investigation didn’t reveal any significant variation in cTnI concentrations between horses in race training and those living on pasture.
• Combining the data from both groups, the average concentration was found to be 0.047 ng/mL with a median of 0 (and a range of 0-0.35 ng/mL). The 90th percentile for cTnI concentration in both groups was 0.11 ng/mL.

Conclusion

• The study concludes by establishing a preliminary reference range for serum cTnI in average Thoroughbred horses, which can be beneficial in future research relating to heart illnesses in horses.