Episode 14 : [Science vs. Myth #7] Creatine for Endurance: The Untapped Secret for a Stronger Finish ⚡️

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Summary: Creatine isn't just for bodybuilders. For endurance athletes, it’s the secret to winning the race in the final moments—not by changing your steady-state pace, but by supercharging the decisive surges, climbs, and finishing sprints. This episode breaks down the real science: creatine supplementation saturates your muscles with phosphocreatine (PCr), fueling the anaerobic "afterburner" system (ATP-PCr) required for 10-15 second explosive bursts. It also enhances muscle glycogen storage (your primary endurance fuel) and acts as an intracellular buffer, helping to delay metabolic fatigue during high-intensity efforts. We translate this into action: use a "Training Block Booster" protocol (3−5 g/day) during intense periods of VO₂max intervals or hill sprints to improve training quality and accelerate recovery. For a peak "A" race, start a loading phase (0.3 g/kg/day) 4 weeks before the event (never race week) to maximize adaptations. We also tackle the "myths": the 1-2 kg of weight gain is intracellular water, not fat. We explain the VO₂max paradox (why a tiny drop in max oxygen uptake might not matter if your sustainable threshold improves ) and confirm that creatine does not cause cramping or kidney damage in healthy individuals. This is the physiology behind Tadej Pogačar's explosive sprint to win a Tour de France mountain stage after hours of racing.

Keywords: creatine, endurance, cycling, running, phosphocreatine, vo₂max, ergogenic aid, supplementation, recovery, sprints

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

Key references : 

Forbes, S. C., Candow, D. G., Neto, J. H. F., Kennedy, M. D., Forbes, J. L., Machado, M.,... & Antonio, J. (2023). Creatine supplementation and endurance performance: surges and sprints to win the race. Journal of the International Society of Sports Nutrition, 20(1), 2204071. https://doi.org/10.1080/15502783.2023.2204071

Gras, L. L., Lanhers, C., et al. (2022). The effect of creatine supplementation on VO2max: a systematic review and meta-analysis of randomized controlled trials. Critical Reviews in Food Science and Nutrition, 63(28), 9694-9707. https://doi.org/10.1080/10408398.2022.2083384

Kreider, R. B., Kalman, D. S., Antonio, J., Ziegenfuss, T. N., Wildman, R., Collins, R.,... & Lopez, H. L. (2017). International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition, 14(1), 18. https://doi.org/10.1186/s12970-017-0173-z

Kreider, R. B., Jäger, R., & Purpura, M. (2022). Bioavailability, Efficacy, Safety, and Regulatory Status of Creatine and Related Compounds: A Critical Review. Nutrients, 14(5), 1035. https://doi.org/10.3390/nu14051035

Lopez, R. M., Casa, D. J., McDermott, B. P., Ganio, M. S., Armstrong, L. E., & Maresh, C. M. (2009). Does creatine supplementation hinder exercise heat tolerance or hydration status? A systematic review with meta-analyses. Journal of Athletic Training, 44(2), 215-223. https://doi.org/10.4085/1062-6050-44.2.215

Mielgo-Ayuso, J., Calleja-Gonzalez, J., Marqués-Jiménez, D., Caballero-García, A., Córdova, A., & Fernández-Lázaro, D. (2023). Effects of Creatine Monohydrate Supplementation on Endurance Performance in Trained Populations: A Systematic Review and Meta-Analysis. Nutrients, 15(5), 1098. https://doi.org/10.3390/nu15051098

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Episode 13 : VO₂max Obsession: The Hidden Truth About Endurance Potential 🎯

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Summary: Why do some athletes with huge VO₂max scores get beaten by those with "smaller engines"? This episode deconstructs the myth of the single metric , revealing that performance is a dynamic triad: VO₂max (the aerobic ceiling) , Lactate Threshold (the percentage of that ceiling you can sustain) , and Exercise Economy (your fuel efficiency). We explore modern physiology, where lactate is a critical fuel, not a waste product , and improving your threshold is about enhancing lactate clearance via mitochondrial density and MCT transporter proteins. We provide validated, actionable protocols: boost your ceiling (VO₂max) with 3-5 minute HIIT intervals paired with crucial long, low-intensity (≤40%) recoveries of 2+ minutes ; master your threshold (LT) with "comfortably hard" tempo sessions (20-40 min) or threshold intervals (e.g., 3x15 min) ; and build "free speed" (Economy) using heavy (≥80% 1RM) strength training and plyometrics —meta-analyses show low-load circuits are not effective for this. The balance shifts: VO₂max is key for novices , but for trained athletes, economy and threshold are the primary drivers of new personal bests. We illustrate this with Paula Radcliffe, whose VO₂max remained stable for 11 years (~70) while her running economy improved by an astounding 15% , unlocking her dominant world record.

Keywords: vo₂max, lactate threshold, exercise economy, hiit, strength training, endurance, running, cycling, physiology, performance

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

Key references : 

Balsalobre-Fernández, C., Santos-Concejero, J., & Grivas, G. V. (2016). Effects of strength training on running economy in highly trained runners: A systematic review with meta-analysis of controlled trials. Journal of Strength and Conditioning Research, 30(8), 2361-2368. https://doi.org/10.1519/JSC.0000000000001316

Casado, A., Foster, C., Bakken, M., & Tjelta, L. I. (2023). Does Lactate-Guided Threshold Interval Training within a High-Volume Low-Intensity Approach Represent the "Next Step" in the Evolution of Endurance Training? International Journal of Environmental Research and Public Health, 20(5), 3782. https://doi.org/10.3390/ijerph20053782

Deng, N., Li, F., Zhang, Y., & Zhang, M. (2023). Effects of high-intensity interval training versus conventional training on maximal oxygen uptake in elite athletes: A meta-analysis. PLOS ONE, 18(6), e0280897. https://doi.org/10.1371/journal.pone.0280897

Milanović, Z., Sporiš, G., & Weston, M. (2015). Effectiveness of high-intensity interval training (HIT) and continuous endurance training for VO2max improvements: A systematic review and meta-analysis of controlled trials. Sports Medicine, 45(10), 1469-1481. https://doi.org/10.1007/s40279-015-0365-0

Ramírez-Campillo, R., Andrade, D. C., García-Pinillos, F., Negra, Y., Boullosa, D., & Izquierdo, M. (2024). Effects of different strength training methods on running economy in middle- and long-distance runners: A systematic review with meta-analysis. Applied Sciences, 14(19), 8976. https://doi.org/10.3390/app14198976

Subbarayalu, A. V. (2024). Lactate threshold training to improve long-distance running performance: A narrative review. Montenegrin Journal of Sports Science and Medicine, 13(1). https://doi.org/10.26773/mjssm.240303

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Episode 12 : [Science vs. Myth #6] The Recovery Beer: Performance Hack or Health Hazard? 🏋️

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Summary: The post-race beer is an athletic tradition, but it creates an illusion of recovery you may not feel sorer, yet you are silently sabotaging long-term adaptation. Alcohol's primary harm is a direct assault on muscle protein synthesis MPS. A high dose more than 1 g/kg severely suppresses the mTOR signaling pathway, reducing MPS by 24-37% even when co-ingested with protein. It also disrupts the hormonal balance by increasing catabolic cortisol and decreasing anabolic testosterone; hinders rehydration if ABV is more than 4%; and profoundly disrupts restorative sleep architecture, suppressing critical REM sleep even at low doses. To protect your gains, prioritize the 3 R's within 30-60 minutes: 20-40g of protein Repair, 1.0-1.2 g/kg of carbs Refuel, and water/electrolytes Rehydrate. If you choose to drink, wait 2-4 hours after your recovery meal and strictly respect the relatively safe threshold of 0.5 g/kg body weight approx 2.5 standard 5% beers for a 70kg athlete. The behavioral factor is also key: alcohol can displace essential carb intake, sabotaging glycogen resynthesis. This is why elite pros at the Tour de France use optimized shakes, and triathletes increasingly choose non-alcoholic beers decoupling the social ritual from the physiological poison.

Keywords: alcohol, recovery, muscle protein synthesis, mtor, glycogen, hydration, sleep, cortisol, endurance, beer

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

Key references : 

• Burke, L. M., van Loon, L. J. C., Hawley, J. A., & Wong, S. H. S. (2017). Post-exercise muscle glycogen resynthesis in humans. Journal of Applied Physiology, 122(5), 1055-1067. https://doi.org/10.1152/japplphysiol.00860.2016 Desbrow, B., Cecchin, D., Jones, A., & Irwin, C. (2021). Got beer? A systematic review of beer and exercise. International Journal of Sport Nutrition and Exercise Metabolism, 31(5), 438-450. https://doi.org/10.1123/ijsnem.2021-0064 Gardiner, C., Weakley, J., Burke, L. M., Roach, G. D., Sargent, C., Maniar, N., Huynh, M., Miller, D. J., Townshend, A., & Halson, S. L. (2025). The effect of alcohol on subsequent sleep in healthy adults: A systematic review and meta-analysis. Sleep Medicine Reviews, 80, 102030. https://doi.org/10.1016/j.smrv.2024.102030 Jiménez-Pavón, D., Cervantes-Borunda, M. S., Díaz, L. E., Marcos, A., & Castillo, M. J. (2015). Effects of a moderate intake of beer on markers of hydration after exercise in the heat: a crossover study. Journal of the International Society of Sports Nutrition, 12(1), 26. https://doi.org/10.1186/s12970-015-0088-5 Lakićević, N. (2019). The effects of alcohol consumption on recovery following resistance exercise: A systematic review. Journal of Functional Morphology and Kinesiology, 4(3), 41. https://doi.org/10.3390/jfmk4030041 Parr, E. B., Camera, D. M., Areta, J. L., Burke, L. M., Phillips, S. M., Hawley, J. A., & Coffey, V. G. (2014). Alcohol ingestion impairs maximal post-exercise rates of myofibrillar protein synthesis following a single bout of concurrent training. PLoS ONE, 9(2), e88384. https://doi.org/10.1371/journal.pone.0088384

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Episode 11 : The Carb-Loading Blueprint: Never Hit The Wall Again ⛽

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Summary: Stop fearing "the wall"—transform your race by turning endurance sport into a strategic eating contest. For events over 90 minutes, a meticulous carb-loading strategy is scientifically proven to improve performance by 2-3%. This episode dismantles the metabolic crisis of "bonking"—the catastrophic performance drop when muscle glycogen (your high-octane fuel) runs out, forcing a reliance on slower fat oxidation. We explain the biology of "supercompensation": how depleting glycogen in training upregulates the enzyme glycogen synthase and enhances insulin sensitivity, turning your muscles into sponges ready to store 1.5-2x their normal fuel load. The modern protocol is clear: 36-48 hours pre-race, combine a taper with 10-12 g/kg/day of low-fiber carbs; top off liver glycogen with 1-4 g/kg 1-4 hours before the start; and during the race (>2.5h), target 60-90 g/hr using dual-source (glucose-fructose) blends to maximize absorption via separate intestinal transporters (SGLT1/GLUT5). We also debunk the myth that female athletes respond differently—they store glycogen equally effectively, provided total energy and absolute g/kg intake are sufficient. This is the strategy of elites like Eliud Kipchoge and Tadej Pogačar, who push intake limits to 100-120 g/hr.

Keywords: carb-loading, glycogen, supercompensation, bonking, hitting the wall, endurance, marathon, cycling, glucose, fructose

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

Key references : 

• Burke, L. M., Hawley, J. A., Wong, S. H., & Jeukendrup, A. E. (2011). Carbohydrates for training and competition. Journal of Sports Sciences, 29(sup1), S17-S27. https://doi.org/10.1080/02640414.2011.585473
• Hawley, J. A., & Leckey, J. J. (2015). Carbohydrate dependence during prolonged, intense exercise: a tale of two fuels. Journal of Applied Physiology, 119(2), 107-115. https://doi.org/10.1152/japplphysiol.00548.2014
• Jensen, R., Ørtenblad, N., Holmberg, H. C., & Christensen, P. M. (2025). Muscle glycogen supercompensation after cycling and running: A systematic review and meta-analysis. Frontiers in Physiology.
• Pöchmüller, M., Schwingshackl, L., Colombani, P. C., & Hoffmann, G. (2016). A systematic review and meta-analysis of carbohydrate benefits associated with randomized controlled competition-based performance trials. Journal of the International Society of Sports Nutrition, 13, 27. https://doi.org/10.1186/s12970-016-0139-6
• Tarnopolsky, M. A. (2001). Gender differences in substrate metabolism during endurance exercise. Journal of Applied Physiology, 91(1), 225-234. https://doi.org/10.1152/jappl.2001.91.1.225
• Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance. Journal of the Academy of Nutrition and Dietetics, 116(3), 501-528. https://doi.org/10.1016/j.jand.2015.12.006

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Episode 10 : [Science vs. Myth #5] "No Pain, No Gain?" is a LIE. Here's What Soreness REALLY Means 🏋️

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Summary: For generations, athletes have chased soreness, believing "No Pain, No Gain". The science is now clear: this is a dangerous myth. Soreness (DOMS) is not a proxy for adaptation; it is a clinical symptom of exercise-induced muscle damage (EIMD) that impairs performance. DOMS isn't the tear itself; it's the delayed "inflammatory soup" of cytokines and swelling that sensitizes your pain receptors 24-72 hours later. Stop wasting time on useless rituals: static stretching is conclusively proven to have zero effect on DOMS or strength recovery. Instead, prioritize fundamentals like 8-10 hours of sleep and immediate post-session nutrition (a 3:1 or 4:1 carb-to-protein ratio). To actively manage severe soreness, science validates massage (the most effective tool), cold water immersion (10-15 min at 10-15°C), and active recovery. However, inflammation is the signal for adaptation. Aggressively blunting it with NSAIDs (no better than placebo) or chronic ice baths might hinder long-term gains. You must periodize recovery: save aggressive tools for competition, not adaptation blocks.

Keywords: doms, exercise-induced muscle damage, eimd, recovery, soreness, stretching, massage, cold water immersion, inflammation, adaptation

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

Key references :

• Afonso, J., Clemente, F. M., Nakamura, F. Y., Morouço, P., Sarmento, H., Inman, R. A., & Ramirez-Campillo, R. (2021). The effectiveness of post-exercise stretching in short-term and delayed recovery of strength, range of motion and delayed onset muscle soreness: A systematic review and meta-analysis of randomized controlled trials. Frontiers in Physiology, 12, 677581. https://doi.org/10.3389/fphys.2021.677581
• Dupuy, O., Douzi, W., Theurot, D., Bosquet, L., & Dugué, B. (2018). An evidence-based approach for choosing post-exercise recovery techniques to reduce markers of muscle damage, soreness, fatigue, and inflammation: A systematic review with meta-analysis. Frontiers in Physiology, 9, 403. https://doi.org/10.3389/fphys.2018.00403
• Guo, J., Li, L., Gong, Y., Zhu, R., Xu, J., Zou, J., & Chen, X. (2017). Massage alleviates delayed onset muscle soreness after strenuous exercise: A systematic review and meta-analysis. Frontiers in Physiology, 8, 747. https://doi.org/10.3389/fphys.2017.00747
• Hill, J., Howatson, G., van Someren, K., Leeder, J., & Pedlar, C. (2014). Compression garments and recovery from exercise-induced muscle damage: a meta-analysis. British Journal of Sports Medicine, 48(18), 1340-1346. http://dx.doi.org/10.1136/bjsports-2013-092456
• Schoenfeld, B. J., & Contreras, B. (2013). Is postexercise muscle soreness a valid indicator of muscular adaptations?. Strength & Conditioning Journal, 35(5), 16-21. https://doi.org/10.1519/SSC.0b013e3182a61820
• Souza, M. C., Dantas, G. A. F., Figueiredo, D. H., & Cabral, B. G. A. T. (2021). Are non-steroidal anti-inflammatory drugs effective for delayed onset muscle soreness treatment? A systematic review and meta-analysis. Revista Brasileira de Medicina do Esporte, 27, 516-521. https://doi.org/10.1590/1517-8692202127052021 0041

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Episode 9 : Vegan vs. Carnivore: What the Science Actually Says (And It's Not What You Think) 🌱

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Summary: This isn't "plants vs. meat"; it's a battle of "evidence vs. anecdote." We cut through the polarized debate to reveal the massive asymmetry in scientific validation. High-level meta-analyses show well-planned vegan diets may offer a "moderate but positive effect on aerobic performance," driven by a synergy of mechanisms: enhanced blood flow via nitrate-to-nitric-oxide conversion (vasodilation), superior glycogen saturation from higher habitual carb intake, and reduced inflammation via massive antioxidant loads. Conversely, the carnivore diet exists in a performance "scientific vacuum"—a case study even showed increased physiological stress (higher heart rate), and analyses confirm it's deficient in key micronutrients like Vitamin C and magnesium, while being void of fiber. Success isn't the label; it's the execution. Vegan athletes must use a "nutrient insurance" protocol: mandatory B12 supplementation, pairing non-heme iron with Vitamin C, and combining protein sources (like rice and beans) to hit the leucine threshold. For carnivore-curious athletes, the only science-backed approach is a "strategic carb" model—using a low-carb baseline but fueling high-intensity efforts and races with 30–90 g of carbs per hour. Zach Bitter's 100-mile record wasn't a pure carnivore victory; he confirms using carbohydrates as "rocket fuel" for his peak performance.

Keywords: vegan, carnivore, endurance, sports nutrition, physiology, evidence-based, metabolic flexibility, glycogen, plant-based

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

Key references :

• Damasceno, Y., Leitão, C., de Oliveira, G., de Lima, J., de Carvalho, P., da Silva, D. C. M., & de Lira, C. A. B. (2024). Plant-based diets benefit aerobic performance and do not compromise strength/power performance: a systematic review and meta-analysis. British Journal of Nutrition, 131(5), 829-840. https://doi.org/10.1017/s0007114523002258
• Kramer, S., Carlsohn, A., & Baur, S. (2021). The impact of vegan and vegetarian diets on physical performance and molecular signaling in skeletal muscle. Current Research in Physiology, 4, 283-291. https://doi.org/10.1016/j.crphys.2021.10.003
• O'Hearn, A. (2024). Can a carnivore diet provide all essential nutrients? Frontiers in Nutrition, 11. https://doi.org/10.3389/fnut.2024.11722875
• O'Malley, M., O'Malley, T., & Williams, C. (2024). The impact of the carnivore diet on athletic performance: a case study. Journal of Exercise and Nutrition, 7(2). https://www.journalofexerciseandnutrition.com/index.php/JEN/article/view/173
• Rogerson, D. (2017). Vegan diets: practical advice for athletes and active individuals. Journal of the International Society of Sports Nutrition, 14(1), 36. https://doi.org/10.1186/s12970-017-0192-9
• Tso, R., & Forde, C. G. (2023). Nutritional considerations for the vegan athlete. Current Opinion in Clinical Nutrition and Metabolic Care, 26(4), 363-370. https://doi.org/10.1097/mco.0000000000000927

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Episode 8 : [Science vs. Myth #4] Are You DESTROYING Your Knees? The Truth About Running Revealed 🏃

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Summary: Does running destroy your knees? A landmark meta-analysis shatters this myth: recreational runners have a lower prevalence of knee osteoarthritis (3.5%) compared to sedentary individuals (10.2%). The "wear and tear" analogy is wrong; articular cartilage is a living, adaptive tissue that requires the "sponge mechanism" of running. This cyclical loading is vital, squeezing out waste and drawing in nutrient-rich fluid. The path to longevity is running intelligently. Build a "muscular exoskeleton" with strength training (≥ 2 days/week, 2-3 sets of 8-12 reps of compound lifts) to make muscles your primary shock absorbers. Reduce impact forces by increasing your cadence 5-10% to prevent overstriding. The risk is a U-shaped curve: inactivity (10.2%) and elite/competitive volume (13.3%) are riskier, though the elite risk may be confounded by acute injuries rather than just mileage.

Keywords: running, knee, osteoarthritis, cartilage, joint health, strength training, biomechanics, cadence, u-shaped curve

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

Key references :

• Alentorn-Geli, E., Samuelsson, K., Musahl, V., Green, C. L., Bhandari, M., & Karlsson, J. (2017). The association of recreational and competitive running with hip and knee osteoarthritis: A systematic review and meta-analysis. Journal of Orthopaedic & Sports Physical Therapy, 47(6), 373-390. https://doi.org/10.2519/jospt.2017.7137
• American College of Sports Medicine. (2009). American College of Sports Medicine position stand. Progression models in resistance training for healthy adults. Medicine and Science in Sports and Exercise, 41(3), 687-708. https://doi.org/10.1249/MSS.0b013e3181915670
• Dhillon, J., Woolnough, T., Luo, T. D., Glogau, A. I., Glogau, C. R., Scillia, A. J., & Kraeutler, M. J. (2023). Effects of running on the development of knee osteoarthritis: An updated systematic review at short-term follow-up. Orthopaedic Journal of Sports Medicine, 11(3), 23259671231152900. https://doi.org/10.1177/23259671231152900
• Khan, M., O'Donovan, J., Charlton, J. M., Roy, J. S., Hunt, M. A., & Esculier, J. F. (2021). The influence of running on lower limb cartilage: A systematic review and meta-analysis. Sports Medicine, 51(11), 2385-2405. https://doi.org/10.1007/s40279-021-01533-5
• Petersen, J., Nielsen, R. O., Rasmussen, S., & Sørensen, H. (2015). The cumulative loads increase in the knee joint at slow-speed running compared with faster running: A biomechanical study. Journal of Orthopaedic & Sports Physical Therapy, 45(3), 218-225. https://doi.org/10.2519/jospt.2015.5469

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Episode 7 : The Sugar Conspiracy: Is It Fueling Your Wins or Your Weakness? ⛽

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Summary: Why do champions like Eliud Kipchoge consume over 100 g of sugar per hour while popular narratives push low-carb? This episode reveals the real "conspiracy": athletes have historically under-fueled. The difference between the podium and the "bonk"—like Pogačar's infamous collapse on the Granon—is energy availability. The old performance ceiling was 60 g/h, the saturation point of the gut's SGLT1 glucose transporter. The modern breakthrough is using Multiple Transportable Carbohydrates (MTCs); adding fructose opens the separate GLUT5 "express lane", smashing the bottleneck to allow absorption of 90 g/h, 120 g/h, or more. This is a trainable adaptation. Your goal for events >2.5 hours is 90 g/h using a mandatory glucose:fructose blend. You must "train your gut" by methodically increasing from 60 g/h in training sessions to upregulate these transporters. For short, hard efforts (45–75 min), a simple mouth rinse provides a powerful neurological benefit. We also explain why ketogenic (LCHF) diets, while boosting fat oxidation, fail for performance: they provide no benefit and impair high-intensity efforts (>70% VO2max) by being less oxygen-efficient.

Keywords: carbohydrate, sugar, endurance, fueling, gut training, mtc, glucose, fructose, marathon, cycling

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

Key references :

• Gejl, K. D., & Nybo, L. (2021). Performance effects of periodized carbohydrate restriction in endurance trained athletes a systematic review and meta-analysis. Journal of the International Society of Sports Nutrition, 18(1), 37. https://doi.org/10.1186/s12970-021-00435-7
• Jeukendrup, A. E. (2014). A step towards personalized sports nutrition: carbohydrate intake during exercise. Sports Medicine, 44(Suppl 1), 25-33. https://doi.org/10.1007/s40279-014-0148-z
• Maughan, R. J., Burke, L. M., Dvorak, J., Larson-Meyer, D. E., Peeling, P., Phillips, S. M., Rawson, E. S., Walsh, N. P., Garthe, I., Geyer, H., Meeusen, R., van Loon, L. J., Shirreffs, S. M., Spriet, L. L., Stuart, M., Vernec, A., Currell, K., Ali, V. M., Budgett, R. G.,... Engebretsen, L. (2018). IOC consensus statement: dietary supplements and the high-performance athlete. British Journal of Sports Medicine, 52(7), 439-455. https://doi.org/10.1136/bjsports-2018-099027
• Pochmuller, M., Schwingshackl, L., Colombani, P. C., & Hoffmann, G. (2016). A systematic review and meta-analysis of carbohydrate benefits associated with randomized controlled competition-based performance trials. Journal of the International Society of Sports Nutrition, 13, 27. https://doi.org/10.1186/s12970-016-0139-6
• Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance. Journal of the Academy of Nutrition and Dietetics, 116(3), 501-528. https://doi.org/10.1016/j.jand.2015.12.006
• Viribay, A., Fernández-Elías, V. E., & Mielgo-Ayuso, J. (2IA). The ergogenic effects of acute carbohydrate feeding on endurance performance: a systematic review, meta-analysis and meta-regression. European Journal of Sport Science, 1-12. https://doi.org/10.1080/17461391.2023.2233812

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Episode 6 : [Science vs. Myth #3] The Stretching LIE: Why Everything You've Been Told Is Wrong 🤸

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Summary: That pre-run static stretch you’ve done for years? The science is clear: it’s not preventing overall injuries and is likely making you slower. This episode dismantles the stretching dogma, revealing the truth behind the ritual—your muscle-tendon system is a biological pogo stick, and its stiffness is crucial for running economy. Prolonged static stretching acutely turns that spring into a sponge, temporarily reducing its ability to store and return elastic energy and impairing performance by an average of 3.7%. We also debunk the recovery myths: lactate isn't a toxic waste product but a valuable fuel your body clears naturally within an hour of exercise , and stretching has no clinically significant effect on delayed onset muscle soreness (DOMS). The true chronic benefit of stretching is neurological—an increase in your nervous system's "stretch tolerance"—not a significant physical lengthening of the muscle. The evidence-based alternative is a dynamic warm-up to prime the system: 5-10 minutes of light cardio followed by active movements like leg swings and walking lunges, and finishing with sport-specific strides. For injury prevention, the data is unequivocal: strength training is vastly more effective, reducing sports injury risk by up to 68.5%, compared to a negligible 3.7% for stretching. If you have a specific mobility restriction, use static stretching as a targeted tool (15-30s holds, 2-4 reps) in a separate session, not as a warm-up. As marathon legend Eliud Kipchoge’s famous inflexibility demonstrates, the goal isn't maximal flexibility but functional mobility tuned for performance.

Keywords: stretching, injury prevention, running economy, dynamic warm-up, static stretching, mobility, strength training, delayed onset muscle soreness, lactate

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

Key references :

• The impact of stretching on sports injury risk: a systematic review of the literature. (2004). Medicine & Science in Sports & Exercise. https://pubmed.ncbi.nlm.nih.gov/150767771
• Effects of stretching before and after exercising on muscle soreness and risk of injury: Systematic review. (2002). BMJ. https://www.researchgate.net/publication/11186856_Effects_of_stretching_before_and_after_exercising_on_muscle_soreness_and_risk_of_injury_Systematic_revieW
• Acute effects of muscle stretching on physical performance, range of motion, and injury incidence in healthy active individuals: a systematic review. (2015). Applied Physiology, Nutrition, and Metabolism. https://cdnsciencepub.com/doi/10.1139/apnm-2015-0235
• Do Exercise-Based Prevention Programs Reduce Injury in Endurance Runners? A Systematic Review and Meta-Analysis. (2024). Sports Medicine. https://pmc.ncbi.nlm.nih.gov/articles/PMC11127851/
• Chronic effects of stretching on range of motion with consideration of... (2023). BMC Sports Science, Medicine and Rehabilitation. https://pmc.ncbi.nlm.nih.gov/articles/PMC10980866/

Voices generated by artificial intelligence from the scientific report produced by the Lactate team.

Episode 5 : Sleep Like a Pro: The Free "Drug" That Boosts Your Growth Hormone 🧬

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☕ Buy a Gel Caf for Lactate to support the work:⁠ https://ko-fi.com/lactate⁠⁠⁠⁠

Summary: Athletes risk their careers injecting a banned hormone that is less effective than the one their body produces for free, in a perfectly timed manner, if they simply go to bed on time. This is because your body’s most potent anabolic event is a massive pulse of Growth Hormone—up to 70-95% of the daily total—released during the first deep, slow-wave sleep (SWS) cycle. Sleep deprivation creates a double jeopardy: it robs you of this powerful anabolic signal while simultaneously elevating the catabolic stress hormone cortisol, creating a hormonal environment that is actively hostile to training adaptation. The result is not just tired muscles but a brain that becomes a "pessimist", dramatically increasing your perception of effort (RPE) long before you are physiologically spent. The key is to protect this early-night "anabolic window" with a fiercely consistent bedtime. Proactively "bank" sleep before a big event by adding 60–90 minutes per night for 5-7 days; a single night of cramming is ineffective. Use naps strategically: a 20–30 minute "power nap" for alertness, or a 90-minute nap to complete a full sleep cycle for deeper recovery. When Stanford basketball players extended their sleep to 10 hours a night, their shooting accuracy improved by over 9%.

Keywords: sleep, growth hormone, recovery, athletic performance, slow-wave sleep, cortisol, periodization, napping, chronobiology

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

Key references :

• Xie, Y., Liu, T., Chen, K., Li, F., & Ma, T. (2025). Effects of sleep deprivation on sports performance and ratings of perceived exertion in athletes and non-athletes: a systematic review and meta-analysis. Frontiers in Physiology, 16, 1544286. https://doi.org/10.3389/fphys.2025.1544286

• Walsh, N. P., Halson, S. L., Sargent, C., Roach, G. D., Nédélec, M., Gupta, L.,... & Samuels, C. (2021). Sleep and the athlete: narrative review and 2021 expert consensus recommendations. British journal of sports medicine, 55(7), 356-368. http://dx.doi.org/10.1136/bjsports-2020-102025
• Mah, C. D., Mah, K. E., Kezirian, E. J., & Dement, W. C. (2011). The effects of sleep extension on the athletic performance of collegiate basketball players. Sleep, 34(7), 943-950. https://doi.org/10.5664/sleep.1132
• Van Cauter, E., Leproult, R., & Plat, L. (2000). Age-related changes in slow wave sleep and REM sleep and relationship with growth hormone and cortisol levels in healthy men. JAMA, 284(7), 861-868. https://doi.org/10.1001/jama.284.7.861
• Robbins, R., Grandner, M. A., Buxton, O. M., Hale, L., Buysse, D. J., Knutson, K. L.,... & Czeisler, C. A. (2019). Sleep myths: an expert-led study to identify false beliefs about sleep that impinge upon population sleep health practices. Sleep health, 5(4), 409-417. https://doi.org/10.1016/j.sleh.2019.02.002
• Roberts, S. S., Teo, W. P., & Warmington, S. A. (2021). Sleep extension in athletes: what we know so far-A systematic review. Sleep medicine, 77, 128-135. https://doi.org/10.1016/j.sleep.2020.11.028

Voices generated by artificial intelligence from the scientific report produced by the Lactate team.