Incidence and risk factors for exertional rhabdomyolysis in thoroughbred racehorses in the United Kingdom.

The research studied exertional rhabdomyolysis, a muscle disorder, in thoroughbred racehorses in the United Kingdom. The study identified the incidence and risk factors such as gender, temperament and age.

Research Methodology

• The researchers used telephone surveys for 34 racing yards housing 1276 horses to find out about exertional rhabdomyolysis in the previous year.
• They conducted a case-control study to investigate the risk factors for this muscle disorder.
• The case-control study included 12 yards chosen based on the routine confirmation of diagnoses that were evaluated by analyzing the serum activities of creatine kinase and aspartate aminotransferase, enzymes typically increased in the blood due to muscle damage.

Research Findings

• The overall incidence of exertional rhabdomyolysis was found to be 6.7% in the surveyed population.
• About 80% of the trainers had at least one horse that was affected by this syndrome.
• In 74% of the horses experiencing this disorder, it was frequently recurring, leading to an average of six lost training days per episode.

Risk Factors

• The research identified several risk factors associated with the onset of exertional rhabdomyolysis.
• Being female was found to be a risk factor. This could potentially be due to hormonal differences, though the study does not specify.
• Another risk factor identified was the horse’s temperament. Specifically, horses with a nervous, excitable temperament were more prone to the syndrome. This could possibly be due to stress or anxiety experienced by these horses increasing muscle tension and leading to the condition.
• The age of the horse was also a significant risk factor. Younger horses, specifically two years old, were more likely to have the syndrome. The reason behind this could be the intense training they undergo which their bodies might be unaccustomed to.