Antioxidant supplementation and pulmonary function at rest and exercise.

The research article explores the impact of a dietary supplement, containing a blend of natural antioxidants and vitamins E, C, and selenium, on the increase of antioxidant capacity in the body and pulmonary function during exercise in healthy horses.

Research Hypothesis

The researchers hypothesized that if healthy horses were given an antioxidant-rich dietary supplement for four weeks, it would increase the systemic and pulmonary antioxidant capacity, potentially reduce markers of oxidative damage, and improve pulmonary function during exercise.

Research Process

• Six healthy horses were studied, and each horse was given the antioxidant supplement.
• The study examined the changes in the plasma concentrations of ascorbic acid and alpha-tocopherol – vital antioxidants.
• The concentration of these antioxidants was also assessed in the bronchoalveolar lavage pulmonary epithelial lining fluid (ELF) of the horses.
• The overall measurement also included the concentration of malondialdehyde (MDA) – a marker of oxidative stress – in ELF.
• An intermittent exercise test consisting of 2 min at 70, 80 and 90% of the horses’ maximum oxygen uptake was conducted to measure oxidative stress and lipid peroxidation.

Research Findings

• The antioxidant supplement increased plasma concentrations of ascorbic acid and alpha-tocopherol significantly.
• The concentration of ascorbic acid in the ELF also increased compared to a placebo, but the increase was not significant.
• There was no detection of alpha-tocopherol in the ELF either before or after supplementation or exercise.
• The concentration of MDA – a marker of oxidative stress – in ELF was lower following antioxidant supplementation compared to placebo and control periods, but the decrease was not significant.
• The exercise test failed to induce significant systemic or pulmonary oxidative stress and lipid peroxidation for both placebo and antioxidant treatments.

Research Implications

In this study on healthy horses, it was found that additional antioxidant supplementation had no apparent beneficial or detrimental effect on pulmonary function during moderate-intensity exercise. The effectiveness of antioxidant supplementation might only be noticeable if the diet lacks antioxidants, if exercise intensity is higher or prolonged, or if disease or additional stresses are present. This suggests that while antioxidant supplementation can increase antioxidant levels in the body, its effect on bodily functions may depend on various factors, such as diet, exercise intensity, and health conditions.