15 Minutes of This Rewires Your Brain & Metabolism — The Science of Lactate | Dr. Stephanie

Dr. Stephanie Estima gives a masterclass on the often-overlooked role of lactate in how our bodies work during exercise. She’s redefining lactate as a key metabolic signal that can help us get stronger, age better and think sharper.

In this solo episode, Dr. Stephanie gets into how lactate is made, how it fuels our energy and why it’s so important when we push ourselves hard. Dr. Stephanie is a big fan of sprinting because it helps us build metabolic power and stay strong, and she’ll also talk about how to use it right and how to recover well.

Episode Overview:
(0:00) Introduction — Lactate Is Not the Enemy
(2:15) Welcome & Episode Roadmap
(4:30) The Myth: How We Got Lactate Wrong
(7:00) What Lactate Actually Is (The Biochemistry)
(9:30) Why Lactate Forms Even With Oxygen
(15:00) The Gear Analogy — Don't Be Metabolically Polite
(18:00) Metabolic Flexibility & Why HIIT Matters
(22:00) How to Dose Your Sprints (Beginner to Advanced)
(24:30) The Lactate Shuttle — Redistribution, Not Waste
(28:30) Mitochondrial Biogenesis & Longevity Signals
(32:00) Lactate and Your Brain — BDNF, Fog & Cognitive Edge
(38:30) Dosing, Recovery Rules & Programming
(46:00) Closing — You Are Remodelling Yourself

Resources mentioned in this episode: https://drstephanieestima.com/podcasts/ep469

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