alpha-Lipoic acid modulates thiol antioxidant defenses and attenuates exercise-induced oxidative stress in standardbred trotters.

The article investigates the effects of a nutritional supplement, DL-alpha-lipoic acid (LA), on reducing oxidative stress caused by strenuous exercise in horses. The study has found that LA enhances the horses’ natural antioxidant defenses and minimizes the damage of exercise-induced stress on their muscles.

Objective and Methodology of the Study

• The aim of the research was to investigate the impact of DL-alpha-lipoic acid (LA), a type of antioxidant, on endurance exercise and recovery in horses.
• The subjects were six standardbred trotters, a specific breed of racehorse. These horses underwent strenuous physical exertion on a treadmill before and after a 5-week treatment of LA supplementation. The dosage was 25 mg for each kg of the horse’s body weight.

Key Findings

• High intensity exercise substantially increased the formation of free radicals, reactive oxygen species that can cause damage to cells, in the gluteus medius muscle of the trotters. The supplementation of LA prevented this rise in free radicals.
• LA significantly increased the activities of thioredoxin reductase and glutathione reductase, two important enzymes involved in the body’s antioxidant defense system. However, the activities of another protein, thioredoxin, were not affected by LA or the exercise regimen.
• The LA supplement also increased the concentration of total glutathione in the muscle at rest, which is another antioxidant that helps protect the body from harm caused by waste products produced during metabolism.
• LA supplementation reduced the effects of oxidative stress, which was demonstrated by the blunted increase in plasma oxygen radical absorbance capacity and the decreased levels of lipid hydroperoxides in plasma and malondialdehyde in plasma and muscle after exercise.

Conclusion and Implication

• The study suggests that DL-alpha-lipoic acid, if given as a supplement, can boost the natural antioxidant defenses of the body and decrease the amount of oxidative stress caused by strenuous exercise in skeletal muscles of horses.
• This study might have significant implications for athletes and individuals regularly engaged in high-intensity physical activities as it could potentially provide a strategy to prevent or minimize muscle damage caused by oxidative stress during strenuous workouts.