This blog post delves into the intricacies of Zone 2 training as discussed by Iñigo San-Millán and Peter Attia. It covers the physiological benefits of Zone 2 training, its impact on mitochondrial function, and the implications for athletes and general health. The conversation also touches on the relationship between lactate levels, fat oxidation, and overall metabolic health, particularly in the context of long COVID and metabolic syndrome.
In a recent episode of The Drive podcast, Peter Attia sat down with Iñigo San-Millán, Ph.D., to discuss the nuances of Zone 2 training and its implications for both athletes and the general population. This blog post summarizes their conversation, highlighting key insights into the physiological benefits of Zone 2 training, its impact on mitochondrial function, and the broader implications for health and performance.
Zone 2 training refers to a specific intensity of exercise that optimally stresses the mitochondria and enhances oxidative capacity. It primarily recruits type I muscle fibers and promotes fat oxidation, making it a crucial component of endurance training. San-Millán emphasizes that this training zone is vital for improving metabolic health and performance.
The discussion begins with a nod to Tadej Pogačar, a young cyclist who has rapidly ascended to prominence in professional cycling. San-Millán's work with Pogačar since 2018 has revealed remarkable physiological capabilities, particularly in lactate clearance and power output. This serves as a backdrop to understanding how elite athletes utilize Zone 2 training to enhance their performance.
San-Millán explains that physiological testing is essential for identifying an athlete's capabilities. He notes that Pogačar's ability to sustain high power outputs with low lactate levels is indicative of exceptional mitochondrial function. The conversation highlights the importance of lactate as a fuel source and its role in predicting performance in endurance sports.
San-Millán outlines the significance of Zone 2 training for both athletes and the general population. He suggests that:
A significant portion of the discussion focuses on the implications of long COVID. San-Millán shares findings from a study indicating that individuals recovering from COVID-19 exhibit mitochondrial dysfunction similar to that seen in type 2 diabetes. This dysfunction manifests as impaired fat oxidation and elevated lactate levels, even in previously healthy individuals.
The findings suggest that:
The conversation also touches on the role of NAD (Nicotinamide adenine dinucleotide) in mitochondrial function. While NAD precursors like NR (Nicotinamide riboside) and NMN (Nicotinamide mononucleotide) are popular supplements, San-Millán cautions against viewing them as a panacea for metabolic health. He emphasizes the need for a holistic approach to health that includes exercise, nutrition, and lifestyle changes.
The insights shared by Iñigo San-Millán and Peter Attia underscore the importance of Zone 2 training for enhancing mitochondrial function and overall metabolic health. As research continues to evolve, understanding the interplay between exercise, lactate clearance, and mitochondrial efficiency will be crucial for both athletes and the general population. The conversation serves as a reminder that exercise remains one of the most potent tools for promoting longevity and health.
