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OJVRTM

Online Journal of Veterinary Research©

Volume 21(3):135-140, 2017.


 Serum muscle enzymes and Mg+2 in horses finalizing and/or disqualified from endurance races.

 

Cinthia B. S. Dumont,  Kaique Nogueira, Anna C. Santos, André R. C. Barreto-Vianna, Carolina da S. Leite, Luciana P. Iglesias,  Eduardo M. M. Lima.

 

Anatomy of Domestic Animals, Faculty of Agronomy and Veterinary Medicine, University of Brasilia, Brasilia, DF, Brazil

Email: limaemm@unb.br;

ABSTRACT

 

Dumont CBS, Nogueira K, Santos AC, Barreto-Vianna ARC, Da S Leite C, Iglesias LP,   Lima EMM., Serum muscle enzymes and Mg+2 in horses finalizing, and disqualified from endurance races. Onl J Vet Res., 21(3):135-140, 2017. Exercise increases metabolic oxygen consumption inducing oxidative stress in racing horses. Differences in serum magnesium (Mg+2), creatine kinase (CK), lactate dehydrogenase (LDH) and aspartate transaminase (AST) levels between purebred Arabian finalist race horses and those disqualified from racing are described. Horses were disqualified at 30, 40, 60km (G1) and 72, 90 and 140km (G2) endurance races. Finalists were raced to 90km (G3). Venous blood was taken immediately after racing or disqualification for determination of Mg+2, AST, CK and LDH. Enzyme values were above resting published normal ranges in horses. Serum AST was ~54% higher in long race distance horses compared to those in short/medium distance races (P<0.05). There was a ~68% difference (P<0.05) in serum LDH between disqualified horses. Mg+2 values were not statistically different between groups but higher values occurred in horses that traveled greater distances. Results suggested that even in disqualified horses, effort did not induce muscle injury or affect CK values. Possibly, racing horses to pre-established distances maintained health after the end of the races as G2 horses were raced further than finalists. High serum Mg, CK, AST and LDH values in racing horses suggested that a transient physiological acute inflammation affecting myocyte cell membrane permeability could have occurred. Monitoring of endurance horses is necessary to prevent muscle injury.

 

Key words: Effort physiology, Equine athletes, Ions, Muscle lesions.


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