Effect of different workload and hydrocortisone in vitro on platelet aggregation in athletic horse.

This research aims to assess how different levels of physical exertion and the introduction of hydrocortisone affect the aggregation, or clustering, of blood platelets in athletic horses. The findings reveal that intense physical activity can inhibit platelet aggregation, potentially as a protective mechanism, while hydrocortisone seems to have no impact on platelet receptor variations.

Study Objective and Method

• The study’s goal was to understand how different kinds of physical activity impact platelet clustering in athletic horses and the role of hydrocortisone in this process.
• Six Sella Italiana gelding athletic horses aged between 8 to 10 years and in good health were subjected to four different physical activities: using a horse-walker, running on a treadmill, and navigating an obstacle course of 1.00 m and another of 1.25 m.
• Blood samples were collected from the horses when they were at rest, immediately post-exercise, and 30 minutes after the conclusion of the exercise.
• The researchers analyzed the blood samples to determine the maximum degree of platelet aggregation and the initial speed of such aggregation following platelet activation with 10 microM ADP and 20 microM ADP.

Impact of Hydrocortisone and Statistical Analysis

• Following these steps, the study investigated the effect of a 20-minute pre-incubation with hydrocortisone on ADP-induced platelet aggregation.
• Statistical methods, such as one-way repeated measures analysis of variance (ANOVA) and Bonferroni’s test, were used to understand the significance of the experimental conditions and workload on platelet aggregation.

Findings and Implications

• The study revealed a statistically significant impact of the exercise on platelet aggregation only when the horses navigated the obstacle courses of 1.00 m and 1.25 m.
• This result suggests that intense exercise may cause an inhibition of platelet aggregation in athletic horses.
• The inhibition of platelet aggregation could potentially be a protective mechanism, possibly linked to the production of nitric oxide, and this finding encourages further investigation.
• Contrarily, the use of hydrocortisone seemed to have no impact on platelet receptor expression — this could help in studying the impact of other anti-inflammatory steroids.