Fast Talk 389: Fast Chats - Should We Be Reconsidering Zone 2 Training
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Sep 18, 2025 Zone 2 training is being critically reevaluated as new research questions its effectiveness. The discussion delves into how previous reviews differ, especially in defining true Zone 2 efforts. They explore the biological pathways involved and how intensity affects these interactions. Practical advice for athletes includes balancing various training intensities while recognizing the need for more long-term studies. The conversation emphasizes the importance of collaboration in the field and a humble approach to understanding exercise physiology.
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Specify The Target Population
- Define your population before applying exercise claims because sedentary and trained people respond differently.
- Avoid blanket statements that 'Zone 2 is best' for everyone without specifying the population.
Zone 2 Must Be Defined By LT1, Not Fixed %
- Definition matters: Zone 2 is exercise just below LT1, not a fixed VO2% like <45%.
- Mislabeling intensities (e.g., calling 65–70% VO2max 'high intensity') distorts study interpretation.
Two Pathways To PGC‑1α
- Two principal biochemical cascades—AMPK and CAMK2—both increase PGC-1α and drive mitochondrial biogenesis.
- The canonical view links high intensity to AMPK and long slow work to CAMK2, but reality is more complex.