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Background  The objective was to determine the effects of agility exercise on dogs of different skill levels with respect to urinary eicosanoids, urinary 15F 2t -isoprostane (lipid peroxidation marker) and hematological/biochemical changes in plasma. Fifteen adult dogs had blood and urine samples obtained prior to, immediately and 4-hours following an agility exercise.    Results  Hematocrit, red blood cells (RBC), albumin, and hemoglobin increased following exercise, with greatest increases correlating to increased skill group (novice, intermediate, masters); at 4-hours post-exercise, hematocrit, RBC, and hemoglobin were decreased. Phosphorus increased following exercise with the greatest increase in novice and intermediates. Plasma lactate increased 3.6-fold in masters, 3.2-fold in intermediates, and 1.2-fold in novice dogs. Urine thromboxane B 2  (TXB2) more than tripled 4-hours post-exercise while 6-keto prostaglandin F 1α  (PGF1α, prostacyclin metabolite), prostaglandin E 2  metabolites (13,14-dihydro-15-keto-prostaglandin A 2  and 13,14-dihydro-15-keto-prostaglandin E 2 ), and 13,14-dihydro-15-keto prostaglandin F 2α  were unaffected as determined by a competitive enzyme immunoassay and standardized by division with urine creatinine. Urine 15F 2t -isoprostane increased insignificantly.    Conclusions  Alterations in the plasma post-exercise were likely due to hemoconcentration from insensible water loss, splenic contraction and sympathetic stimulation while 4-hours later autohemodilution reduced RBC parameters. Elevations in plasma lactate and urinary TXB2 correlated with advanced skill level/speed of the dogs.

The effect of agility exercise on eicosanoid excretion, oxidant status, and plasma lactate in dogs