Effect of training on the activity of muscle enzymes in seropositive and seronegative equines for equine infectious anemia.

Equine infectious anemia (EIA) is an incurable disease of equids with an almost worldwide distribution, being endemic in the Pantanal Matogrossense region, where the disease control through euthanasia of seropositive animals is not mandatory. Most studies about exercise physiology are performed in sport horses and little investigation is made for working animals (Santos et al, 2002), and there are no reports on functional performance of EIA-positive horses. Analysis of the activity of creatine phosphokinase (CK), aspartate aminotransferase (AST) and lactate dehydrogenase (LDH) are necessary to evaluate the skeletal muscle function. The objective of this study was to evaluate the serum activity of CK, AST and LDH in EIA seropositive and seronegative horses submitted to training.