Lipoic acid as an antioxidant in mature thoroughbred geldings: a preliminary study.

The study explores the effects of alpha-Lipoic acid (LA), a known antioxidant, on mature thoroughbred geldings (castrated male horses). Over a period of two weeks, the researchers found that LA reduced oxidative stress in horses with light activity, suggesting further research on horses under strenuous exercise could be beneficial.

Objective and Methodology

• The purpose of this research was to investigate if the antioxidant effects of LA observed in humans and lab animals would also appear in horses. Antioxidants are crucial because they prevent damage to cells by neutralizing harmful free radicals. The researchers specifically used mature Thoroughbred geldings in this experimental study.
• They divided the geldings into two groups: one was fed 10 mg per kg of weight per day of LA along with their normal feed, while the other group received only the feed as a control. They drew blood samples at different intervals: the start of the study, after one week and two weeks of supplementation, and 48 hours after the last supplement dose.

Testing and Analysis

• The blood samples were then analyzed, specifically looking at the levels of glutathione (GSH), glutathione peroxidase (GPx), and total plasma lipid hydroperoxides (LPO) present in the red and white blood cells and plasma. These elements were a focus due to their relevance to the antioxidant pathway.
• The levels of LPO in the blood are indicative of oxidative stress; a decrease in these levels could suggest that LA was effectively acting as an antioxidant. The amounts of GSH and GPx also help measure antioxidant capacity.
• The results were statistically analyzed to look for differences between the two groups and changes over time.

Results and Conclusion

• The researchers observed significant differences in the levels of LPO between the two groups. With LA supplementation, there was a decrease in LPO, indicating a reduction in oxidative stress.
• No considerable differences were seen in the concentration of GSH and GPx over time or between the two groups. However, GPx concentration in the white blood cells of the LA group decreased at first and second week.
• They concluded that alpha-Lipoic acid had no harmful impacts and appeared to moderately decrease oxidative stress in horses that were allowed light activity. This positive outcome provided a basis for further research into the impacts of LA on horses subjected to more rigorous exercise.