Evaluation of Biological Indicators of Fatigue and Muscle Damage in Arabian Horses After Race.
Authors: Mami Sajad, Khaje Gholamhossein, Shahriari Ali, Gooraninejad Saad
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Biological Indicators of Fatigue and Muscle Damage in Arabian Horses After Race Researchers tracked blood biochemical changes in six Arabian horses (aged 3–6 years) competing in short-distance races (1,250–1,400 metres) to better understand exercise-induced fatigue and muscle injury at the cellular level. Blood samples were collected at four timepoints—one hour pre-race, immediately post-race, and at one and 24 hours post-race—with analysis focusing on antioxidant enzyme activity (catalase, superoxide dismutase, glutathione peroxidase), oxidative stress markers (malondialdehyde, protein carbonyl, total antioxidant capacity), and muscle damage indicators (aspartate aminotransferase, lactate dehydrogenase, creatine kinase, myoglobin). Catalase activity and total antioxidant capacity spiked immediately after racing before declining, whilst superoxide dismutase increased progressively post-race; muscle damage markers rose significantly with peak values at one hour post-race (aspartate aminotransferase elevated immediately and sustained for an hour; lactate dehydrogenase and creatine kinase peaked at one hour), yet all remained within normal physiological ranges. For practitioners, these findings suggest that whilst short-distance Arabian racing induces measurable metabolic and oxidative stress responses, this represents normal exercise adaptation rather than pathological muscle breakdown—important context when interpreting bloodwork results and planning recovery protocols that may support antioxidant status without unnecessary intervention for clinically insignificant elevations.
Read the full abstract on PubMed
Practical Takeaways
- •Post-race elevation of muscle enzymes (AST, LDH, CK) is expected in Arabian horses after 1,250-1,400m races but does not necessarily indicate pathological muscle damage if values remain within normal ranges
- •Antioxidant enzyme responses vary in timing post-exercise; monitoring trends over 24 hours provides better assessment than single sampling points
- •Racing conditions induced measurable fatigue and biochemical changes in these Arabian horses, but recovery appeared normal with values normalizing by 24 hours
Key Findings
- •Catalase activity and total antioxidant capacity increased immediately post-race then declined gradually
- •Superoxide dismutase showed incremental increase after racing
- •Aspartate aminotransferase, lactate dehydrogenase, and creatine kinase peaked at 1 hour post-race
- •Elevated muscle damage biomarkers remained within natural physiological ranges despite fatigue, indicating no pathological muscle damage occurred