Episode 40 : MARATHON PREP #1 The Ultimate Guide to Race Day Nutrition ⚡

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Summary:

While early marathoners relied on brandy and strychnine, modern performance is defined by the strategic manipulation of bioavailability under physiological duress. At race intensities of 75-85% VO2max, you sit on a metabolic tipping point where endogenous glycogen stores (<100 mmol/kg) become the limiting substrate, forcing the brain to downregulate motor output to prevent catastrophic fatigue ; the bottleneck is not gastric emptying but intestinal absorption, where SGLT1 transporters saturate at 60g/hour, though combining glucose with fructose (GLUT5) unlocks oxidation rates exceeding 100g/hour. To capitalize on this, implement a supercompensation protocol of 10-12g/kg carbohydrates for 36-48 hours pre-race to double muscle glycogen 4; on race day, aim for 90-120g/hour if elite with a trained gut, or 30-60g/hour if amateur, utilizing hydrogels to minimize GI distress during ischemia. While low-carb (LCHF) strategies may serve ultra-endurance, they impair high-intensity economy required for the marathon, proving that while you can run on fat, you cannot run your fastest marathon without glycolytic flux.

Keywords:

marathon, nutrition, glycogen, vo2max, hydrogel, glucose, fructose, hydration, gut training, performance

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

Key references :

Bergström, J., & Hultman, E. (1966). Muscle glycogen synthesis after exercise: an enhancing factor localized to the muscle cells in man. Nature.

Costill, D. L., Sparks, K., Gregor, R., & Turner, C. (1971). Muscle glycogen utilization during exhaustive running. Journal of Applied Physiology. https://pubmed.ncbi.nlm.nih.gov/5111852/

Jentjens, R., & Jeukendrup, A. E. (2004). Oxidation of combined ingestion of glucose and fructose during exercise. Journal of Applied Physiology. https://journals.physiology.org/doi/10.1152/japplphysiol.00974.2003

Burke, L. M., et al. (2017). Low carbohydrate, high fat diet impairs exercise economy and performance in elite endurance athletes. Journal of Physiology. [Referencing general LCHF findings in report].

American College of Sports Medicine. (2007). Position Stand: Exercise and Fluid Replacement. https://www.khsaa.org/sportsmedicine/heat/exerciseandfluidreplacement.pdf

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Episode 39 : Carbon Plate Shoes Miracle or Marketing? The ULTIMATE Guide 👟

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Summary: Marketing sells you a spring, but biomechanics reveals a lever. This episode dissects the "Super Shoe" paradigm where the high-stack PEBA foam acts as the engine returning 87% of energy, while the curved carbon plate provides the steering and stability that makes the foam usable; research validates a running economy improvement of 2.7% to 4.2%, but this is velocity-dependent, with benefits diminishing significantly below 14 km/h where the stiffness may become detrimental. We analyze the critical role of rocker geometry in offloading calf muscles and the "teeter-totter" effect, while cautioning against the new injury phenotype of navicular stress fractures caused by exclusive use; you will learn why "super trainers" might be better for daily miles, why the foam dies after 450 km, and how Fila pioneered this decades before Nike's Vaporfly changed the sport's history.

Keywords: peba foam, carbon plate, running economy, biomechanics, marathon, nike vaporfly, injury prevention, navicular stress, super shoes, velocity threshold

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

Key references :

Hoogkamer, W., Kipp, S., Frank, J. H., Farina, E. M., Luo, G., & Kram, R. (2018). A Comparison of the Energetic Cost of Running in Marathon Racing Shoes. Sports Medicine, 48(4), 1009-1019. https://doi.org/10.1007/s40279-017-0811-2

Joubert, D. P., & Jones, G. P. (2022). A Comparison of Running Economy Across Seven Carbon-Plated Racing Shoes. Footwear Science, 14(3). https://doi.org/10.1080/19424280.2022.2038691

Tenforde, A. S., Hoenig, T., Saxena, A., & Hollander, K. (2023). Bone Stress Injuries in Runners Using Carbon Fiber Plate Footwear. Sports Medicine, 53(8), 1499-1505. https://doi.org/10.1007/s40279-023-01818-z

Agresta, C., Giacomazzi, C., Harrast, M., & Zendler, J. (2022). Running Injury Paradigms and Their Influence on Footwear Design Features. Frontiers in Sports and Active Living, 4. https://doi.org/10.3389/fspor.2022.8156755

Barnes, K. R., & Kilding, A. E. (2019). A Randomized Crossover Study Investigating the Running Economy of Highly-Trained Male and Female Distance Runners in Marathon Racing Shoes versus Track Spikes. Sports Medicine, 49(2), 331-342.

Rodrigo-Carranza, V., et al. (2022). The effects of footwear midsole longitudinal bending stiffness on running economy and biomechanics. European Journal of Sport Science.

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Episode 38 : Episode 38 [CODE #7] The Ketone HYPE Miracle Fuel or Marketing Gimmick? 🧪

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Summary:

From a $10 million DARPA military project to the "jet fuel" of the professional peloton, exogenous ketones promise a dual-fuel state previously impossible in human evolution; achieving nutritional ketosis (>0.5 mM) while maintaining full glycogen stores. The physiology is rigorous but double-edged: while ketone esters increase thermodynamic efficiency (higher P/O ratio) and spare muscle glycogen by entering the Krebs Cycle directly as Acetyl-CoA, they simultaneously inhibit the Pyruvate Dehydrogenase Complex (PDH), effectively braking glycolysis and capping high-intensity anaerobic power. For training, this dictates a strict protocol: avoid usage during criteriums, VO₂max intervals, or stochastic racing where sprint power is required; instead, utilize esters immediately post-exercise to upregulate mTOR and accelerate glycogen resynthesis, or reserve them for steady-state ultra-endurance efforts exceeding six hours where intensity remains sub-threshold. The nuance lies in the formulation hierarchy, as common salts often fail to reach therapeutic levels (>2 mM) and carry massive sodium loads, while the gold-standard monoesters risk severe gastrointestinal distress, famously rumored to have impacted Tom Dumoulin’s 2017 Giro d'Italia.

Keywords: exogenous ketones, ketone esters, dual fuel, glycogen sparing, pdh inhibition, recovery, mtor, darpa, ultra-endurance, metabolic flexibility

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

Key references :

Cox, P. J., et al. (2016). Nutritional Ketosis Alters Fuel Preference and Thereby Endurance Performance in Athletes. Cell Metabolism. https://doi.org/10.1016/j.cmet.2016.07.010

Leckey, J. J., et al. (2017). Ketone Diester Ingestion Impairs Time-Trial Performance in Professional Cyclists. Frontiers in Physiology. https://doi.org/10.3389/fphys.2017.00806

Poffé, C., et al. (2019). Exogenous Ketosis Impacts Training Overload and Recovery. American Journal of Physiology-Cell Physiology. https://doi.org/10.1152/ajpcell.00098.2019

NIH. (2025). The Effect of Exogenous Ketone Bodies on Cognition: A Systematic Review. https://pmc.ncbi.nlm.nih.gov/articles/PMC12458514/

Veech, R. (2003). Development of Ketone Ester Diets. NIH Grant Z01-AA000112-01. https://grantome.com/grant/NIH/Z01-AA000112-01

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Episode 37 : The "Second Brain": Is Your Gut Bacteria Deciding Your Finish Time? 🧠

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Summary:

Stop viewing your body as a solitary machine; science confirms you are a "holobiont," a vessel for trillions of microorganisms that dictate your metabolic efficiency and psychological drive. The physiological game-changer is Veillonella atypica, a bacteria that feasts on the lactate produced during maximal effort and converts it into propionate, a short-chain fatty acid that provides secondary fuel and boosts endurance by 13% in murine models. However, intense exercise causes splanchnic ischemia (blood flow <20%), leading to tight junction failure and "leaky gut," where toxic LPS floods the bloodstream and triggers systemic collapse. To harness your microbiome, manage the "FODMAP paradox": eat high-fiber diversity during training blocks, but switch to low-FODMAP foods 24–48 hours pre-race to minimize gas; simultaneously, practice "gut training" with high carb volumes to upregulate SGLT1 transporters. Be wary of antibiotics, which can slash voluntary training volume by 21% by disrupting dopamine signaling, and remember that the resilient "elite signature" found in rugby players vanishes weeks after training stops.

Keywords:

microbiome, veillonella, lactate, leaky gut, probiotics, holobiont, fodmap, endotoxemia, dopamine, ischemia

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

Key references :

Scheiman, A. B., et al. (2019). Meta-omics analysis of elite athletes identifies a performance-enhancing microbe that functions via lactate metabolism. Nature Medicine. https://pubmed.ncbi.nlm.nih.gov/31235964/

Clarke, S. F., et al. (2014). Exercise and associated dietary extremes impact on gut microbial diversity. Gut. https://gut.bmj.com/content/63/12/1913

Brock-Utne, J. G., et al. (1988). Endotoxaemia in exhausted runners after a long-distance race. South African Medical Journal. https://journals.co.za/doi/pdf/10.10520/AJA20785135_9151

Mach, N., & Fuster-Botella, D. (2017). Endurance exercise and gut microbiota: A review. Journal of Sport and Health Science. https://pmc.ncbi.nlm.nih.gov/articles/PMC6188999/

Roussos, G., et al. (2025). Gastrointestinal function and microbiota in endurance athletes. Frontiers in Physiology. https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2025.1551284/full

O’Sullivan, et al. (2022). Oral antibiotics reduce voluntary exercise behavior in athletic mice. Behavioural Processes. https://pmc.ncbi.nlm.nih.gov/articles/PMC9725099/

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Episode 36 : Gels, Bars & Powders Your Ultimate Guide to Choosing the Right Fuel ⛽

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Summary:

From the strychnine cocktails of 1904 to the hydrogel technology fueling modern sub-2-hour marathons, sports nutrition has evolved from dangerous folklore to precise molecular engineering designed to bypass physiological bottlenecks. The primary limiter in endurance efforts exceeding 90 minutes is glycogen depletion, yet the body’s SGLT1 intestinal transporter saturates at a "speed limit" of roughly 60g/h; exceeding this with single-source carbs leads to GI distress rather than performance gains. To unlock higher oxidation rates, elite protocols utilize multiple transportable carbohydrates—specifically a Glucose:Fructose ratio (classically 2:1, now optimizing toward 1:0.8)—to engage the independent GLUT5 transporter, allowing intake of 90-120g/h and oxidation rates up to 1.75g/min. While elites spend 6-10 weeks "training the gut" to tolerate these volumes, you should aim for a safe baseline of 60g/h using isotonic gels or drink mixes every 20 minutes, avoiding solids during high-intensity efforts (>75% VO₂max) where gastric emptying slows significantly. Always chase hypertonic gels with water to prevent the duodenal brake from trapping fluid in your gut, a critical mistake that leads to dehydration and bloating.

Keywords: sports nutrition, glycogen depletion, sglt1 transporter, hydrogel, glucose fructose ratio, gastric emptying, endurance fueling, bonking, gut training, isotonic.

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

Key references :

Coyle, E. F., Coggan, A. R., Hemmert, M. K., & Ivy, J. L. (1986). Muscle glycogen utilization during prolonged strenuous exercise when fed carbohydrate. Journal of Applied Physiology, 61(1), 165-172.

Jentjens, R. L., et al. (2004). Oxidation of combined ingestion of glucose and fructose during exercise. Journal of Applied Physiology, 96(4), 1277-1284.

Jeukendrup, A. E. (2004). Carbohydrate intake during exercise and performance. Nutrition, 20(7-8), 669-677.

King, A., et al. (2020). Carbohydrate Hydrogel Products Do Not Improve Performance or Gastrointestinal Distress During Moderate-Intensity Endurance Exercise. International Journal of Sport Nutrition and Exercise Metabolism, 30(5), 305-314.

Rowe, J. T., et al. (2022). Graphite-hydrogel ingestion improves 5-km running performance. Medicine & Science in Sports & Exercise.

American College of Sports Medicine (ACSM). (2016). Nutrition and Athletic Performance. Medicine & Science in Sports & Exercise, 48(3), 543-568.

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Episode 35 : Is Your WATCH Lying To You? The Truth About HRV ⌚

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Summary:

Your recovery score says you’re wrecked, but you feel ready to crush a PR—discover why your wearable might be gaslighting your physiology. Heart rate variability (HRV) is not about stability, but chaos; a healthy heart acts as a fractal mirror of the environment, balancing the slow sympathetic "gas" against the rapid parasympathetic "brake" of the vagus nerve. While photoplethysmography sensors in devices like Whoop or Oura match gold-standard ECGs with correlations over 0.99, the "lie" hides in proprietary black-box algorithms that penalize sleep stages or activity balances regardless of your actual autonomic status (RMSSD). High HRV signals robust neurovisceral integration where the prefrontal cortex inhibits the amygdala, whereas low HRV predicts rigidity and mortality. Stop chasing gamified "readiness" scores and use the Plews & Seiler decision tree on raw data: establish a 7-day rolling average baseline with a smallest worthwhile change range. If your HRV is within range, train hard; if significantly low, stick to Zone 1/2 recovery; if remarkably high, beware of parasympathetic hyperactivity signaling impending illness. For elite athletes with low resting heart rates (<50 bpm), switch to morning orthostatic readings to avoid parasympathetic saturation and unmask fatigue. Beware of orthosomnia, where the anxiety of tracking degrades sleep, and remember the blue whale: its heart drops to 2 bpm to survive depth, proving that extreme variability is the ultimate adaptation strategy.

Keywords: hrv, rmssd, autonomic nervous system, vagus nerve, recovery, orthosomnia, whoop, oura, plews, seiler

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

Key references :

Dial, M. B., et al. (2025). Validation of nocturnal resting heart rate and heart rate variability in consumer wearables. Physiological Reports.

Miller, D. J., et al. (2022). Validation of the WHOOP 3.0 for the assessment of heart rate variability. Sensors.

Thayer, J. F., & Lane, R. D. (2000). A model of neurovisceral integration in emotion regulation and dysregulation. Journal of Affective Disorders.

Plews, D. J., et al. (2013). Heart rate variability in elite triathletes, is variation good? European Journal of Sport Science.

Task Force of the European Society of Cardiology. (1996). Heart rate variability: standards of measurement, physiological interpretation and clinical use. Circulation.

Kromenacker, B. W., et al. (2022). Root mean square of successive differences is not a valid measure of parasympathetic reactivity during slow deep breathing. American Journal of Physiology.

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Episode 34 [CODE #6] The Altitude Code Is "Live High, Train Low" The Only Way? 🏔️

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Summary:

To get fit, you must go where the air is thin; to get fast, you must go where the air is thick. This "oxygen paradox" is resolved by the "Live High, Train Low" (LHTL) model, which isolates physiological adaptations from training intensity. The hypoxic stress of living at 2,000–2,500m stabilizes the HIF-1 alpha transcription factor, triggering the kidneys to release erythropoietin (EPO) and driving the bone marrow to increase hemoglobin mass (Hbmass) and VO₂max; however, this mechanism strictly requires iron stores with ferritin levels >50 µg/L to function. To avoid the neuromuscular detraining seen in "Live High, Train High" approaches, you must descend to below 1,250m for high-intensity sessions. While 3–4 weeks at altitude provides the optimal blood-boosting dose, heat training has emerged as a "poor man's altitude," expanding plasma volume to maintain these gains. Be aware of the "neocytolysis" effect upon return, where the body culls young red blood cells, and the stark genetic reality that some athletes are simply non-responders. From the tragic 1875 Zénith balloon ascent to modern nitrogen houses, the quest for oxygen remains the defining limit of performance.

Keywords: altitude training, hypoxia, erythropoietin, hemoglobin mass, vo2max, heat training, iron deficiency, physiology, endurance, lhtl

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

Key references :

Levine, B. D., & Stray-Gundersen, J. (1997). 'Living high-training low': Effect of moderate-altitude acclimatization with low-altitude training on performance. Journal of Applied Physiology.

Chapman, R. F., et al. (1998). Individual variation in response to altitude training. Journal of Applied Physiology.

Siebenmann, C., et al. (2012). The placebo effect of mountain air. Journal of Applied Physiology.

Lundby, C., & Robach, P. (2025). Altitude or heat training to increase haemoglobin mass and endurance exercise performance in elite sport. Fisiología del Ejercicio.

West, J. B. (2015). History of high altitude medicine and physiology. Thoracic Key.

Gore, C. J., et al. (2013). Altitude training. In Encyclopedia of Exercise Medicine in Health and Disease.

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Episode 33 : Strength for Cyclists - The POWERHOUSE Exercises You Aren't Doing 🏋️

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Summary:

The history of cycling performance has shifted from the volume-heavy dogma of Fausto Coppi to a modern era of biomechanical optimization where the gym is a non-negotiable engine builder. Heavy resistance training (≥85% 1RM) triggers critical neural adaptations—specifically rate coding and motor unit recruitment—that improve cycling economy and delay Type II fiber fatigue without adding detrimental mass, while single-leg exercises utilize "luxury perfusion" to bypass central cardiovascular limits. To unlock these gains, implement the "Powerhouse" protocol: prioritize heavy single-leg step-ups and hex bar deadlifts (3–5 sets of 4–6 reps) to secure the posterior chain, and perform seated calf raises to target the soleus; ensure a 6–24 hour separation between lifting and riding to manage the AMPK-mTOR interference effect. Beyond raw power, strengthen the hip flexors to eliminate dead spots in your upstroke and incorporate plyometrics for osteogenic health. From Graeme Obree’s washing machine bearings to Robert Förstemann’s toaster-blowing wattage, this approach transforms you from a pair of lungs into a complete machine.

Keywords:

cycling economy, neural adaptation, single-leg training, soleus, hip flexors, interference effect, heavy strength training, posterior chain, plyometrics

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

Key references :

Abbiss, C. R., et al. (2010). Single-leg cycle training is superior to double-leg cycling in improving the oxidative potential and metabolic profile of trained skeletal muscle. Journal of Applied Physiology. https://journals.physiology.org/doi/10.1152/japplphysiol.01247.2010

Rønnestad, B. R., et al. (2025). Heavy strength training effects on physiological determinants of endurance cyclist performance: a systematic review with meta-analysis. PubMed. https://pubmed.ncbi.nlm.nih.gov/40632222/

Kinzey, S. J., et al. (2024). Triceps surae muscle hypertrophy is greater after standing versus seated calf-raise training. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC10753835/

Markovic, G. (2007). Does plyometric training improve vertical jump height? A meta-analytical review. British Journal of Sports Medicine. https://pmc.ncbi.nlm.nih.gov/articles/PMC2465309/

Held, T., et al. (2025). Effects of blood flow restriction training on aerobic capacity and performance in endurance athletes: a systematic review. Fisiología del Ejercicio. https://www.fisiologiadelejercicio.com/wp-content/uploads/2025/07/Effects-of-blood-flow-restriction-training.pdf

Burns, M. J., et al. (2014). Single-leg cycling to maintain and improve function in healthy and clinical populations. Frontiers in Physiology. https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2023.1105772/full

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Episode 32 [CODE #5] The Heat Adaptation Code: Turn a Furnace Into Your Advantage 🔥

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Summary:

Heat adaptation is not merely a transient state of comfort but a systemic biological reconstruction that acts as an offensive performance enhancer, potentially functioning as a "poor man's altitude" for cool-weather gains; the physiological overhaul begins with hypervolemia, a 6.5% to 13% expansion of plasma volume within 3–6 days that boosts stroke volume and lowers heart rate by 12–18 bpm (bradycardia), while sudomotor remodeling increases sweat rates by 20% and the aldosterone pathway reduces sweat sodium concentration by up to 50% to preserve electrolytes. To engineer these adaptations, protocols range from "Active Heat Acclimation" comprising 60–90 minutes of Zone 1–2 exercise in 30–35°C heat to "Passive Heating" via post-exercise hot water immersion (~40°C for 20–30 minutes), with elite strategies utilizing "Controlled Hyperthermia" to clamp rectal temperature (e.g., 38.5°C) for precise heat shock protein transcription. These adaptations are rented, not owned, decaying at ~2.5% per day without exposure, necessitating top-up sessions every 2–3 days during tapering; history underscores the stakes, from Charles Blagden’s 1774 survival in a 127°C room proving the power of evaporation to the cerebral hyperthermia-induced hallucinations of "Badwater" ultramarathon runners.

Keywords:

heat adaptation, hypervolemia, plasma volume, heat shock proteins, aldosterone, sudomotor remodeling, heat acclimation, core temperature

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

Key references :

Tyler, C. J., Reeve, T., Hodges, G. J., & Cheung, S. S. (2016). The effects of heat adaptation on physiology, perception and exercise performance in the heat: A meta-analysis. Sports Medicine.

Nielsen, B., Hales, J. R., Strange, S., Christensen, N. J., Warberg, J., & Saltin, B. (1993). Human circulatory and thermoregulatory adaptations with heat acclimation and exercise in a hot, dry environment. The Journal of Physiology.

Lorenzo, S., Halliwill, J. R., Sawka, M. N., & Minson, C. T. (2010). Heat acclimation improves exercise performance in a cool environment. Journal of Applied Physiology.

Karlsen, A., et al. (2015). Heat acclimatization does not improve exercise performance in a cool condition. Scandinavian Journal of Medicine & Science in Sports.

Périard, J. D., et al. (2015). Adaptations and mechanisms of human heat acclimation. Scandinavian Journal of Medicine & Science in Sports.

Gibson, O. R., et al. (2015). Isothermic vs Fixed Intensity Heat Acclimation. Journal of Thermal Biology.

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Episode 31 : Run Faster Without Running More? The Scientific Truth About Plyometrics 🚀

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Summary: Runners often hit a physiological ceiling where accumulating more mileage fails to improve speed; the solution lies not in building a bigger aerobic engine, but in engineering a more efficient chassis. By targeting the Stretch-Shortening Cycle (SSC) and increasing musculotendinous stiffness, plyometrics minimizes energy dissipated as heat (hysteresis) and optimizes the myotatic reflex to recycle ground reaction forces. This adaptation improves Running Economy (RE) by 2–8% independent of VO₂max, effectively turning the legs from compliant shock absorbers into reactive springs. A proper protocol requires a minimum effective dose over 6–10 weeks; amateurs must progress from landing mechanics (snap downs, 40–60 contacts) to extensive rhythm work (pogo hops, 80–120 contacts) before attempting intensive power (box jumps), while avoiding fatigue which degrades the critical neural signal. From Fred Wilt’s FBI surveillance of Soviet "shock methods" to Eliud Kipchoge’s rhythmic step drills in Kaptagat, stiffness remains the hidden variable of elite endurance performance.

Keywords: plyometrics, running economy, tendon stiffness, stretch-shortening cycle, neuromuscular training, shock method, injury prevention, biomechanics

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

Key references :

Paavolainen, L., Häkkinen, K., Hämäläinen, I., Nummela, A., & Rusko, H. (1999). Explosive-strength training improves 5-km running time by improving running economy and muscle power. Journal of Applied Physiology, 86(5), 1527-1533. https://doi.org/10.1152/jappl.1999.86.5.1527

Saunders, P. U., et al. (2006). Short-term plyometric training improves running economy in highly trained middle and long distance runners. Journal of Strength and Conditioning Research, 20(4), 947-954.

Spurrs, R. W., Murphy, A. J., & Watsford, M. L. (2003). The effect of plyometric training on distance running performance. European Journal of Applied Physiology, 89(1), 1-7.

Eihara, Y., et al. (2022). Heavy Resistance Training Versus Plyometric Training for Improving Running Economy and Running Time Trial Performance: A Systematic Review and Meta-analysis. Sports Medicine - Open, 8(1), 138.

Kubo, K., Ishigaki, T., & Ikebukuro, T. (2017). Effects of plyometric and isometric training on muscle and tendon stiffness in vivo. Physiological Reports, 5(15), e13374.

Verkhoshansky, Y. (1968). The Shock Method of the development of explosive strength. Theory and Practice of Physical Culture, 8.

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