Epidemiology of exertional rhabdomyolysis susceptibility in standardbred horses reveals associated risk factors and underlying enhanced performance.
Authors: Isgren Cajsa M, Upjohn Melissa M, Fernandez-Fuente Marta, Massey Claire, Pollott Geoff, Verheyen Kristien L P, Piercy Richard J
Journal: PloS one
Summary
# Editorial Summary Exertional rhabdomyolysis (ER) affects athletic horses across multiple breeds, yet Standardbred trotters—despite their prevalence in racing worldwide—have been largely absent from epidemiological research on this costly syndrome. Isgren and colleagues conducted a comprehensive investigation into ER incidence, associated risk factors, and performance consequences in Standardbreds, employing epidemiological analysis alongside genetic comparison with affected individuals from other breeds. The research identified specific demographic and training-related factors predisposing Standardbreds to ER, whilst notably demonstrating that horses with susceptibility to the condition often exhibited superior racing performance metrics compared to unaffected cohorts. These findings have significant implications for breeding and management decisions in Standardbred racing populations, suggesting that selection against ER susceptibility may inadvertently compromise the performance traits breeders actively cultivate. Understanding the genetic and physiological basis of ER in this breed therefore presents a genuine tension between welfare concerns and performance objectives—one that requires informed decision-making among veterinarians, trainers, and breeding organisations.
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Practical Takeaways
- •Standardbred trainers and veterinarians should screen for exertional rhabdomyolysis risk factors in racing stock to prevent costly performance loss and welfare issues
- •Understanding breed-specific and genetic predisposition to the syndrome allows for better selection and management of susceptible horses
- •Early identification of affected horses enables intervention before severe myopathic episodes occur
Key Findings
- •Exertional rhabdomyolysis syndrome occurs in Standardbred horses with identifiable risk factors and performance consequences
- •Specific forms of the syndrome are breed-specific and have genetic components
- •Affected horses show measurable impacts on racing performance and athletic capability