Peter Attia MD294 ‒ Peak athletic performance: How to measure it and how to train for it
CHAPTERS
- 0:00 – 8:03
Olav's Background and Athletes
Peter Attia welcomes Olav Bu and asks who he is. Olav describes growing up on a Norwegian farm, his engineering background, the 2011 event that pushed him toward sports, his work with elite triathletes, and his company Enthalpy.
- •Olav grew up on a farm in Norway and was drawn to technology and extreme sports
- •He combined exercise physiology with technology to study elite athletes in their normal training settings
- •He personally coaches Kristian Blummenfelt, Gustav Iden and Kenji Nino, who hold records across triathlon distances
- •He is building Enthalpy, applying AI and numerical models, and coaches coaches at Olympic and world tour level
- 8:03 – 19:50
Energy Conversion and Black-Boxing Human Performance
Peter asks for the 101 of ATP production. Olav explains the metabolic pathways and says that, in practice, treating the body as an engine with energy in and distance per time out is often more useful than digging into every mechanism.
- •Proteins, fats and carbohydrates are converted to ATP, which requires oxygen
- •Our understanding of the metabolic and signaling pathways is still incomplete
- •Olav sometimes black-boxes the mechanisms and watches whether performance improves
- •Velocity (distance per time) is the ultimate performance metric, split into biomechanical efficiency and work economy
- 19:50 – 28:43
Mindful Low-Intensity Training and the 200-Watt Ride
Peter shares his old 200-watt time trial workout, in which speed improved at constant power. Olav says low-intensity work leaves cognitive reserve to refine position and movement, so it need not be junk mileage.
- •Peter's speed rose from about 20.5 to 22 mph at a fixed 200 watts
- •Olav says power meters only capture net mechanical power, and power varies within each pedal revolution
- •Low intensity gives cognitive room to feel and program body position
- •Olav argues that low, medium and high intensity sessions should all be high quality and mindful
- •Single-sport specialists tend to use this time more than triathletes, who solve tasks by brute force
- 28:43 – 36:34
Swim Flume Testing and the Efficiency Gap
Olav describes testing athletes with a metabolic cart in a full-scale swim flume. The triathletes have a higher VO2 max than elite swimmers, yet an Olympic bronze medalist swims the same speed using far less oxygen, showing the importance of efficiency.
- •The flume gives a natural stroke in smooth, turbulence-free water at a set speed
- •Kristian and Gustav have a higher VO2 max than the best swimmers in the world
- •A large Olympic bronze medalist swam at the same speed with almost 25% less oxygen
- •Peter notes that he, with a VO2 max above five liters on the bike, was beaten by technically superior swimmers
- 36:34 – 47:37
VO2 Max as a Longevity Predictor and Its Limits for Performance
Peter explains why he calls VO2 max the greatest predictor of lifespan and asks where it falls short for elite performance. Olav agrees on longevity but says the maximum sustainable energy expenditure and event specificity limit how useful a higher VO2 max is for specialists.
- •Peter describes VO2 max as an integrator of work that cannot be changed quickly
- •Olav says VO2 max encompasses heart, lungs and other functions, which is why it predicts so broadly
- •A three-to-five-minute effort is a good proxy for VO2 max
- •Sustainable energy expenditure limits how much time can go into raising VO2 max versus event-specific work
- •Power at VO2 max depends on how long the athlete took to reach it
- 47:37 – 58:16
How VO2 Max Is Measured in the Lab
Peter asks how VO2 max is tested, and Olav walks through the lab setup: measuring ventilation and gas concentrations, then using stoichiometry to link oxygen consumption to energy release. He also ties a higher VO2 max to resilience during illness.
- •Weight is measured, then the athlete exercises while flow and O2/CO2 concentrations are measured
- •Only roughly a quarter of inhaled oxygen is extracted
- •Stoichiometry and indirect calorimetry connect oxygen use to joules released
- •Burning in the muscles is from hydrogen ions, not lactate, which Olav calls a super fuel
- •A bigger reserve means illness takes a smaller fraction of capacity, a point Peter backs with the energy cost of fever
- 58:16 – 1:10:34
Absolute vs Relative VO2 Max and 60-Minute Power
Olav explains why he works with absolute values and describes how cutting weight lowered both absolute and relative VO2 max in his athletes. The conversation then turns to 60-minute power per kilogram as a predictor in hilly racing, versus shorter tests.
- •Weight reduction lowered absolute VO2 max by more than the weight drop, so relative VO2 max also fell
- •Peter suggests doubly labeled water; Olav prefers repeated resting metabolic rate measures
- •Absolute numbers matter for propulsion on flat courses; relative matters more on hills
- •Sixty-minute power per kilo is robust, while shorter durations hide the glycolytic contribution
- •Peter cites about 6.5 watts/kg versus 5.5 for 60 minutes, in eras with and without oxygenated PEDs
- 1:10:34 – 1:28:02
Portable Metabolic Analyzers and the VO2 Master
Peter asks whether portable devices are accurate enough, particularly for VCO2. Olav compares lab and portable technology, describes the VO2 Master and its field use, and says the difference from the lab for his athletes is about 50 milliliters.
- •Olav uses a Jaeger Oxycon with a mixing chamber in the lab and also likes the AEI Moxus
- •The VO2 Master mounts on a mask, uses differential pressure and connects to a phone or Garmin
- •VCO2 is in the prototype and is expected on the market the following year
- •Lab and portable VO2 differ by about 50 milliliters for athletes near seven liters
- •Field use trades some absolute accuracy for real-world conditions
- 1:28:02 – 1:44:40
Ventilation Noise, Breath-Holding and Pacing Calibration
Olav explains why ventilation is a noisy measure, using breath-holding and swallowing as examples. Peter suggests a heart-rate and ventilation experiment, and the discussion moves to how elite athletes can be poorly calibrated in pacing.
- •Breathing is further from performance than power, with regulatory mechanisms producing fluctuations
- •Holding your breath creates a debt followed by spikes in ventilation and VO2
- •Peter says CO2 acts as a proxy for pH, so ventilation changes move heart rate at constant power
- •Elite athletes may start too hard or too light, reducing total kilojoules
- •Peter describes his own ascending-power VO2 max intervals
- 1:44:40 – 1:52:27
Detuning VO2 Max for Ironman and Energy Limits
Olav reveals that the athletes' VO2 max was deliberately lowered for Ironman, since energy supply limits sustaining both a high VO2 max and long-duration power. Peter calculates the energy demand and compares it to what the gut can absorb.
- •VO2 max fell from near 90 to below 80 ml/kg/min for Ironman
- •Peter compares the change to detuning an engine from Formula 1 to Le Mans
- •Olav's simplification: about 20 joules of energy per milliliter of oxygen
- •At six liters per minute, demand is about 1,800 calories per hour, beyond what the gut can supply
- •Five-minute surges are not important in an Ironman, so training time shifts away from them
- 1:52:27 – 1:58:47
Training to Raise VO2 Max: Accumulated Work, Cadence and Torque
Olav proposes thinking of intervals as maximizing accumulated work at high intensity within the available time, and discusses torque versus cadence. Peter asks about interval length, and Olav says no single workout is golden and that the limit on VO2 max is central rather than mitochondrial.
- •Shorter or varied intervals may pack more kilojoules at high power than five-minute intervals
- •Higher torque recruits more fibers and shifts substrate, while higher cadence raises gross power and VO2
- •Different interval types give different benefits, such as core temperature and plasma volume
- •Mitochondria can use far more oxygen than the body delivers, so VO2 max is a central limit
- •Carbohydrate uptake is higher than what can be supplied, making fueling a gut supply problem
- 1:58:47 – 2:24:03
Priming, Repeated VO2 Max Efforts and RER
Olav says a VO2 max effort can be repeated with higher values after about 10 minutes of rest, and that this can produce an RER below accepted validity criteria. Peter then asks what RER is, leading to resting RER and the role of diet.
- •Rest of roughly 10 to 20 minutes can allow a higher second VO2 max and power
- •Body temperature and hemoglobin affinity are offered as factors
- •RER can fall near 1.0 despite higher VO2, challenging the 1.1 criterion
- •RER is VCO2 divided by VO2, and resting metabolism affects it at low power
- •Athletes on high-carb diets have a high resting RER
- 2:24:03 – 2:44:30
Lactate, Zone Two and Lactate Thresholds
Peter explains his zone two training and asks about lactate in elite athletes. Olav emphasizes enjoyment and sustainability for non-athletes, then they discuss LT1, LT2 and maximum lactate steady state, including how MLSS relates to RER and race distance.
- •Peter defines zone two as his highest power with lactate below about 2 mmol
- •Olav says lactate is a concentration metric and a redundant marker of substrate use
- •Fixed values like 4 mmol depend on the protocol; inflection points are more useful
- •LT1 is near fat max and LT2 near maximum lactate steady state
- •Olav says MLSS occurs at a lower RER as event distance gets longer
- 2:44:30 – 2:47:03
Wrap-Up and Closing Thoughts
Peter notes how much remains uncovered and hopes for an in-person second round. Olav closes by urging respect for the terminology coaches and athletes already use effectively and acknowledging how much is still unknown.
- •Peter lists topics not reached, including muscle biopsies, MCT density, temperature and PEDs
- •Olav says his athletes' fat oxidation is high even on a high-carb diet
- •Olav asks listeners not to quarrel over definitions if a shared language works
- •Both look forward to a second conversation
