That Triathlon Show

Physiological Profiling Explained - Why, How, and Important Training Implications for Triathletes

Mar 5, 2026
Jack Hutchins, triathlon coach and physiology specialist, explains how knowing your fiber-type leaning can change training. He covers profiling methods like power-duration and lactate, differences between fast- and slow-twitch athletes, and practical implications for intensity, volume, session structure, recovery, nutrition, and group training. The conversation highlights testing pitfalls and how to tailor plans to individual profiles.
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INSIGHT

Lactate Measures Help Separate Glycolytic From Aerobic Strengths

  • Peak blood lactate or VLaMax estimates add important context to profiles.
  • Mikael samples lactate after maximal tests or uses short sprints to estimate glycolytic capacity when a dedicated VLaMax test isn't done.
ADVICE

Tailor Block Lengths And Intensity To Profile

  • Adjust periodization length based on profile: slow-twitch athletes can sustain longer VO2max blocks; fast-twitch athletes need shorter intense blocks.
  • Reduce high-volume threshold work for fast-twitch athletes to avoid overreaching.
ADVICE

Give More Rest Within Sessions For Fatigable Athletes

  • Reduce volume of high-intensity work and shorten work:rest ratios for fast-twitch athletes.
  • Example: change threshold work from 3:1 to 2:1 work:rest and sweet-spot from 4:1 to 3:1 on fatigable athletes.
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