Altered homeostasis of extracellular matrix proteins in joints of standardbred trotters during a long-term training programme.

The research article studies the effect of prolonged, demanding training, age, and lameness on the release of certain proteins associated with joint health in Standardbred trotters during a 24-month training program.

Research Objectives and Methodology

• The aim of the study was to understand the changes in the release of certain extracellular matrix proteins in the joints of Standardbred trotters during a long-term strenuous training program. Specific proteins of interest were cartilage oligomeric matrix protein (sf-COMP), aggrecan, and collagen type II.
• 28 Standardbred trotters, ages ranging from 19.5 to 40 months, were observed during a 24-month training program. All training sessions were conducted by the same trainer and every horse was deemed healthy before commencing the training program.
• Every three months, synovial fluid samples were taken from the left middle carpal joint of each horse. Using an enzyme-linked immunosorbent assay, the concentrations of sf-COMP, sf-aggrecan, and sf-collagen type II in the synovial fluid were determined.

Findings and Interpretation

• The study found that the concentration of sf-COMP in the synovial fluid decreased as the age of the horse increased and the total number of training days accumulated. However, it was not possible to distinguish between the effect of age and the total number of training days on the sf-COMP concentration since both had similar effects.
• Furthermore, the researchers observed that prolonged training led to an increase in the breakdown (or degradation) products of collagen type II in the synovial fluid.
• The data suggests that the extensive and long-term training programs were causing metabolic changes in the articular cartilage. This was evidenced by the reduced synthesis and release of COMP, likely due to the intense training causing undue stress on the articular cartilage.

Conclusion

• The research indicates how long-term, intense training programs can affect the health of joints, particularly the articular cartilage, in sports horses like Standardbred trotters. Understanding these changes and their implications could potentially lead to more effective training programs and preventive strategies for lameness and other related conditions in sports horses.