Fast Talk 391: How to Use Physiological Data to Determine the Work You Should Do
Oct 2, 2025
Jared Berg, an experienced physiologist with over 20 years in athlete testing, shares insights on using lab and field data to optimize training. He discusses the significance of specificity in interval training and how running and cycling adapt differently. Jared explains VO2 max and lactate testing, highlighting how these metrics inform athlete profiles. He emphasizes the importance of endurance work and how to use lactate feedback for interval control. Finally, he touches on common training mistakes and the next frontier in precise physiological control.
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Intervals Produce Both Shared And Specific Gains
- Interval formats overlap but also produce specific adaptations depending on intensity and rest.
- Jared Berg says intervals can target different systems and even be zone-two work when structured deliberately.
Test Choice Matters For Accurate Thresholds
- Use VO2 max ramp tests to measure maximal oxygen uptake and lactate or metabolic tests with longer stages to identify VT1/VT2.
- Validate ventilatory thresholds with lactate when possible for more accurate zone anchors.
Relative Thresholds Reveal Potential
- Compare VT1, VT2 and VO2 max to see where an athlete sits physiologically and where potential exists.
- High-level athletes often have VT1/VT2 close to VO2 max, signaling a need to raise the VO2 ceiling.