Science of zone 2 cardiovascular exercise (Part 1) | Inigo San Millan, PhD

Zone Definitions

Understanding cardiovascular training zones is crucial for optimizing exercise benefits. Inigo San Millan emphasizes that while Zone 2 is vital, other zones like Zone 3 and Zone 4 also play significant roles in a comprehensive training regimen 1. He argues against the oversimplification of labeling these zones as "junk volume," highlighting their importance for enhancing glycolytic pathways and mitochondrial function 1. Simon Hill and Inigo also discuss the limitations of current technology in accurately determining exercise intensity, advocating for more personalized approaches 2.

   

Intensity Optimization

Balancing exercise intensity across different zones is key to maximizing health benefits. Inigo advises ensuring that Zone 2 training remains consistent to reap its full benefits, suggesting that sporadic dips into other zones may require longer sessions to compensate 3. He also notes that while wearable devices can track heart rate zones, they may not accurately reflect metabolic activity, especially during resistance training 4.

You might see the majority of the time, actually, you're in zone two, but it's a recovery phase. Right. It's not a metabolic phase where you specifically stimulating that mitochondria function.

--- Inigo San Millan

This highlights the need for a nuanced understanding of how different exercises contribute to overall fitness.

   

Aerobic Base

Building a strong aerobic base is foundational for cardiovascular health and performance. Inigo explains that while VO2 max is a traditional measure of fitness, it doesn't fully capture the cellular-level differences that contribute to performance 5. He stresses the importance of mitochondrial function in distinguishing between athletes with similar VO2 max levels 5.

Within the cellular level, you know, everything happens, or the king of the cells or the queen, because they come from the mother, we should say, our mitochondria.

--- Inigo San Millan

This cellular focus is crucial for understanding how to effectively build an aerobic base through targeted training.