The Effects of Various Levels of Docosahexaenoic Acid on Inflammatory Markers in Conditioned Horses During Lactate Threshold Tests.

The research article discusses a study performed on polo horses to investigate the impact of different doses of docosahexaenoic acid (DHA), a type of Omega-3 fatty acid, on inflammation after exercise. The paper theorizes that higher doses of DHA would help reduce inflammation caused by exercise.

Study Design and Methodology

• The study involved twenty polo horses which were divided into one control group and three treatment groups. The control group was fed grain and hay while the groups for treatment received 10, 20, or 50 g/day of DHA supplements along with grain and hay, over a period of 60 days.
• The horses underwent lactate threshold (LT) tests at three different points – before the study began and after 30 and 60 days of supplementation.
• Blood samples were taken while the horses were at rest. These samples were then subjected to various types of analysis to monitor the horses’ health and response to the DHA supplements.

Outcomes and Findings

• The study found a dose-dependent increase in plasma DHA levels – the more DHA the horses received, the more DHA was observed in their plasma.
• What was unexpected was that the horses receiving higher doses of DHA (20 and 50g) had the highest levels of arachidonic acid, a pro-inflammatory substance. They also had the lowest levels of vitamin E, an essential nutrient for horses.
• Conducting the lactate threshold tests (exercise) resulted in noteworthy changes in inflammation markers. Levels of the pro-inflammatory cytokines, IL-1 and TNF-α, decreased, while anti-inflammatory cytokines, IL-10 and interferon gamma, showed an increase.
• Horses receiving 10 g of DHA had lower levels of interferon gamma and IL-10 after exercise, compared to other treatment groups, indicating a dampened inflammatory response.
• The researchers speculate that the lack of effects observed in the 20 and 50 g treatment groups may be due to the lack of oxidants in the supplements.

Significance and Implications

• The findings suggest that 10 g of DHA could be effective in moderating post-exercise inflammation in horses. However, the lack of expected effects in higher dosage groups calls for additional research to understand the role of antioxidants and possible interaction with DHA supplementation.
• This to help determine optimal levels of DHA supplementation for managing post-exercise inflammation in polo horses and potentially other equine athletes.