Abstract
Exercise stimulates the release of inflammatory cytokines and supplementation with n-3 fatty acids reduces inflammation. The effects of different doses of docosahexaenoic acid (DHA) on inflammation in polo horses submitted to field lactate threshold tests (LT) were analyzed. We hypothesized that higher doses of DHA would reduce postexercise inflammation. Twenty polo horses were assigned to different treatments: control group fed (n = 5) grain and hay, 3 treatment groups (n = 5) fed 10, 20, or 50 g/day of DHA with grain and free choice hay during 60 days. Horses underwent LT tests before start, 30, and 60 days of supplementation. Blood samples were taken at rest for blood cytokine expression (CEx), plasma cytokine enzyme-linked immunosorbent assay (CEL), fatty acid, vitamin E, and creatine kinase (CK) analysis, after LT for CEx analysis (interferon gamma, tumor necrosis factor alpha [TNF-α], interleukin-1 [IL-1], interleukin-6 [IL-6], interleukin-10 [IL-10]), CEL, and CK analysis. Effects of treatment, time, and exercise were analyzed by analysis of variance, significant results compared by least square means analysis, and significance set at P < .05. There was a dose-dependent increase in plasma DHA, and highest arachidonic acid was found in 20 and 50 g. Vitamin E was lowest in 20 and 50 g. LT did not change IL-6, downregulated IL-1 and TNF-α, upregulated IL-10, and interferon gamma. The 10 g led to postexercise downregulation of interferon gamma and IL-10 CEx compared to other treatments. A lack of antioxidants in the supplements may have led to the absence of treatment effects in the 20 and 50 g. 10 g DHA helped moderate postexercise inflammation.
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