Supplementation Alters Antioxidant Response to HIIT

Eight Weeks of Supplementation Alters Antioxidant Response to HIIT

A 2026 study from the University of Vienna provides a detailed look at how nutritional support can change the body’s biochemical reaction to high-intensity interval training. Researchers led by Daniel König found that eight weeks of supplementation with a yeast cell-derived formulation containing β-glucans and micronutrients increased overall antioxidant capacity in moderately active men. The study used standardized HIIT sessions as a controlled physiological stress model to measure changes in redox and immune markers.

Targeting Redox Dynamics with Nutrition and Exercise

The trial involved 39 healthy men who were randomly assigned to receive either the supplement or a placebo for eight weeks. The supplement contained β-glucans and micronutrients derived from yeast cells. All participants completed a standardized HIIT session before and after the intervention, allowing researchers to measure acute oxidative and inflammatory responses. They tracked reactive oxygen species (ROS), total antioxidant capacity (FRAP), superoxide dismutase (SOD), and inflammatory cytokines like IL-6 and TNF-α.

Fasting FRAP levels increased significantly in the supplemented group after eight weeks, a change not seen in the placebo group. König’s team also identified a correlation: individuals who showed a greater acute reduction in ROS after taking the supplement also experienced a larger chronic increase in FRAP. This suggests a link between immediate nutrient-mediated effects and long-term adaptation of the antioxidant system.

Increased Antioxidant Enzymes Post-Exercise

Superoxide dismutase is a critical enzyme that neutralizes superoxide radicals, a type of ROS. In the POST-intervention HIIT test, SOD activity was higher at the 60-minute recovery mark in the supplemented group compared to placebo. A significant time-by-group interaction confirmed their trajectories were different. This points to an enhanced ability to ramp up endogenous antioxidant defenses after a hard effort, potentially aiding recovery. It is important to note that the supplement did not blunt the initial ROS surge from HIIT, which is essential for triggering cellular adaptations like mitochondrial biogenesis.

Modulating Inflammation and Immune Response

The inflammatory picture was nuanced. Tumor necrosis factor-alpha (TNF-α) decreased across the eight weeks, but only in participants who started with elevated baseline levels. Those with low initial concentrations saw no change. This indicates a normalizing effect rather than a blanket suppression of inflammation, which could be beneficial. The supplemented group also reported upper respiratory tract infections that were, on average, 1.4 days shorter. Fewer participants experienced prolonged episodes lasting over ten days. While these immune findings did not reach statistical significance in this moderately-sized group, they align with the known immunomodulatory properties of β-glucans and warrant a larger follow-up study.

Supporting Metabolic Fitness Without Interfering with Stress

This research clarifies a practical concept for athletes and fitness enthusiasts: nutritional support can be designed to bolster the body’s resilience without removing the stimulus required for growth. The yeast cell-derived formulation helped build a higher baseline antioxidant capacity and improved the post-exercise enzymatic response, but it did not interfere with the acute oxidative signal from HIIT. For individuals engaged in regular intense training, this balance is vital. Enhancing recovery systems may allow for more consistent training quality, which is a cornerstone of improving endurance performance and metabolic health.

The study’s focus was on HIIT as a stress model, but the principle likely extends to other training modalities. Whether the primary goal is maximizing the benefits of zone 2 cardio or recovering from high-intensity sessions, a robust and responsive antioxidant system is a key component of metabolic fitness. The findings suggest targeted supplementation, alongside a quality diet, can be part of a strategy to support that system.

Sources:
https://pubmed.ncbi.nlm.nih.gov/42197007/
https://pubmed.ncbi.nlm.nih.gov/42161155/
https://pubmed.ncbi.nlm.nih.gov/42145854/