Fast Talk 391: How to Use Physiological Data to Determine the Work You Should Do
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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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Use Real Races As Practical Tests
- Use races and 'hero' efforts as practical at-home tests for max outputs across durations.
- Track best 5s, 30s, 1min, 5min, 60min, 2hr efforts to build a power-duration profile.
Raise Low Zone‑Two By Doing More Zone‑Two
- If LT1 sits at low % of VO2 max (e.g., ~65%), prioritize zone-two/endurance work to raise aerobic base.
- Use longer zone-two blocks or repeated near-LT1 intervals to shift LT1 upward.
Target Threshold When LT2 Is Low
- If LT2 is below ~80% of VO2 max, prioritize threshold (LT2) intervals to move it closer to ~90% of VO2 max.
- Use structured threshold sets with rest and progressive overload rather than endless hard steady state.