Episode 75 [TOUR DE FRANCE SCIENCE] Power, Watts & The 8,000-Calorie Limit 🚴‍♂️

Episode 75 [TOUR DE FRANCE SCIENCE] Power, Watts & The 8,000-Calorie Limit 🚴‍♂️💬 Got a question or feedback? Write us at: [email protected]☕ Buy a Gel Caf for Lactate to support the work: ko-fi.com/lactateSummary: How are modern Tour de France riders shattering records from the EPO era on heavier bikes? This episode deconstructs the staggering bioenergetics behind Tadej Pogačar’s 7.0 W/kg ascents. We dissect the core science, starting with Herman Pontzer's "Alimentary Limit"—a hard ceiling on human endurance at 2.5 times your Basal Metabolic Rate (BMR). You'll learn why the Tour, at a punishing 4.9x BMR, is a 21-day exercise in controlled metabolic self-destruction, survivable only due to its short duration. We then break down the brutal thermodynamics of climbing: with a Gross Mechanical Efficiency of only 23%, a rider's body must dissipate nearly 1500 watts of waste heat, all while their gut is starved of blood flow. This analysis explains the modern fueling revolution, where ingesting 120g/hr of carbohydrates via a precise 1:0.8 glucose-to-fructose ratio is now standard. Finally, we translate this elite science into an actionable blueprint for you. Learn why you must respect the 2.5x BMR limit on multi-day adventures, how to implement a low-residue pre-race diet, the benefits of fueling Zone 2 rides, and how to "train your gut" to avoid catastrophic GI distress.Keywords: tour de france, cycling, physiology, w/kg, vo₂max, nutrition, alimentary limit, tadej pogačar, gross efficiency, gut training🎙️ Lactate, the podcast that deciphers science to improve your performance.Key references :Thurber, C., Dugas, L.R., Ocobock, C., Carlson, B., Speakman, J.R., & Pontzer, H. (2019). Extreme events reveal an alimentary limit on sustained maximal human energy expenditure. *Science Advances, 5*(6), eaaw0341. https://www.researchgate.net/publication/333729202_Extreme_events_reveal_an_alimentary_limit_on_sustained_maximal_human_energy_expenditureBerg, O. K. (2024). The Exceptional Power Outputs and VO₂ of climbing in the Tour de France. *Journal of Science and Cycling*. https://www.jsc-journal.com/index.php/JSC/article/view/1054EF Pro Cycling. (n.d.). The Science of Gut Training: How Tour de France Riders Maximize... Retrieved May 2, 2026, from https://www.efprocycling.com/tips-recipes/tour-de-france-tips-gut-training/road.cc. (2024). Comparing the Tour de France bikes that won on the Plateau de Beille in 1998 and 2024: Marco Pantani's Bianchi Mega Pro XL vs Tadej Pogačar's Colnago V4Rs. Retrieved May 2, 2026, from https://road.cc/content/feature/pantanis-1998-bianchi-vs-pogacars-2024-colnago-309423Voices generated by artificial intelligence from the scientific report produced by the Lactate team.