Episode 1 : The "Turbo Button" in Your Muscles: Unlocking Your 3 Energy Systems ⚙️

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Summary: Two race days, two endings: the dreaded wall vs. the perfect negative split. The difference isn’t grit—it’s how your three engines work together from the first step. The Phosphagen system (your supercapacitor) delivers instant power for starts and surges. The Glycolytic system (your turbo) sustains hard efforts for minutes. The Oxidative system (your ultra-efficient diesel) powers everything beyond, including recovery between intervals. They don’t take turns; they blend like faders on a mixing desk, with the aerobic engine contributing far earlier than old models suggested. Lactate isn’t “toxic waste”—it’s high-octane fuel and a training signal. Becoming elite means producing, shuttling, and oxidizing lactate efficiently, lifting your sustainable red line (MLSS) while sharpening your kick. Translate theory into practice with precise protocols: short all-out sprints with long rests to reload PCr; 30–180 s intervals to raise glycolytic power/capacity; threshold blocks and VO₂max work to expand oxidative horsepower. Organize the week with a polarized 80/20 distribution—lots of truly easy, a little very hard—to maximize adaptation while limiting stale “grey zone” fatigue. Dial in nuance: sex differences favor greater fat use in many women (and distinct fueling opportunities), while masters athletes protect speed and metabolism with strength + HIIT alongside a big aerobic base. For inspiration, revisit Kipchoge’s 1:59:40: colossal VO₂max, world-class economy, a high threshold with low lactate production rate, smart drafting/shoes, and meticulous fueling—all three engines in perfect symphony.

Keywords: VO₂max, endurance, lactate, triathlon, training.

🎙️ Lactate, the podcast that deciphers science to improve your performance.

Key references :

• Gastin, P. B. (2001). Energy system interaction and relative contribution during maximal exercise. Sports Medicine, 31(10), 725–741. https://pubmed.ncbi.nlm.nih.gov/11547894/

• Egan, B., & Zierath, J. R. (2013). Exercise metabolism and adaptation in skeletal muscle. Cold Spring Harbor Perspectives in Medicine, 3(2), a004895. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10527431/

• Milanović, Z., Sporiš, G., & Weston, M. (2015). Effectiveness of high-intensity interval training (HIIT) and continuous endurance training for VO₂max improvements: A systematic review and meta-analysis. Sports Medicine, 45(10), 1469–1481. https://pmc.ncbi.nlm.nih.gov/articles/PMC8294064/

• Stöggl, T., & Sperlich, B. (2014). Polarized training has greater impact on key endurance variables than threshold, high intensity, or high volume training. Frontiers in Physiology, 5, 33. https://pmc.ncbi.nlm.nih.gov/articles/PMC3912323/

• • Tarnopolsky, L. J., & Ruby, B. C. (2001). Gender differences in substrate metabolism during endurance exercise. Canadian Journal of Applied Physiology, 26(6), 556–568. https://cdnsciencepub.com/doi/10.1139/h00-024
  • Hoogkamer, W., Kram, R., & Arellano, C. J. (2017). Factors influencing running performance during a marathon: Breaking the 2-h barrier. Sports Medicine, 47(4), 709–721. https://pmc.ncbi.nlm.nih.gov/articles/PMC8924290/