Episode 77 [IRONMAN NUTRITION SPECIAL] Fueling for a 10+ Hour Race 🏊‍♂️

Episode 77 [IRONMAN NUTRITION SPECIAL] Fueling for a 10+ Hour Race 🏊‍♂️💬 Got a question or feedback? Write us at: [email protected]☕ Buy a Gel Caf for Lactate to support the work: ko-fi.com/lactateSummary: The televised collapse of Julie Moss at the 1982 Ironman cemented nutrition as the "Fourth Discipline," proving that mental toughness cannot override thermodynamics. This episode dissects the unique bioenergetic crisis of a 10+ hour race, moving beyond simple gels to explore the inescapable caloric deficit where expenditure (700-1,000 kcal/hr) dwarfs absorption capacity (~400 kcal/hr). We unpack the severe consequences of splanchnic ischemia—the shutdown of blood flow to your gut—and the neurobiology of Sensory-Specific Satiety, the "flavor fatigue" that causes your brain to reject the very fuel you need to survive. This deep dive delivers a practical blueprint for execution: learn the elite caffeine micro-dosing protocol that avoids the late-race crash, how to optimize your bike's aerodynamics to carry fuel without penalty, why training your gut with race-day nutrition is non-negotiable, and how to use your Special Needs bags to deliver a "sensory reset" that keeps you fueling for all 10, 12, or 17 hours.Keywords: ironman, ultra-endurance, nutrition, physiology, splanchnic ischemia, glycogen, caffeine, gut training, aerodynamics, flavor fatigue🎙️ Lactate, the podcast that deciphers science to improve your performance.Key references :Dasa, M. S., Bu, O. A., Sandbakk, Ø., Rønnestad, B. R., Plasqui, G., Gundersen, H., & Kristoffersen, M. (2024). Training volume and total energy expenditure of an Olympic and Ironman world champion: approaching the upper limits of human capabilities. *Journal of Applied Physiology*.Costa, R. J. S., et al. (2017). Gastrointestinal distress: Running versus cycling under matched conditions. *Journal of Science and Medicine in Sport*.How endurance athletes can beat 'flavour fatigue'. Precision Fuel & Hydration. https://www.precisionhydration.com/performance-advice/nutrition/what-is-flavour-fatigue-and-how-endurance-athletes-can-keep-fueling/How much caffeine should you use DURING training and races? Precision Hydration. https://www.precisionhydration.com/performance-advice/nutrition/how-much-caffeine-should-athletes-use/Ironman's New Bike Hydration Rules 2024: What You Need to Know. Dietitian Approved. https://www.dietitianapproved.com/blog/ironman-bike-hydration-rules-2024Voices generated by artificial intelligence from the scientific report produced by the Lactate team.