Exercise Physiology.
Oxygen, thresholds and adaptation — the physiology beneath every training plan.
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Physiology sets the ceiling everything else operates under. It is also the domain where the most confident round numbers — target heart rates, fat-burning zones, magic thresholds — dissolve the moment you measure an individual.
What this field actually measures
- VO₂max
Maximum rate of oxygen consumption during exhaustive exercise.
ReferenceUntrained adults sit near 35–45 ml/kg/min; elite endurance athletes reach roughly 70–85.
LimitA high ceiling does not win races. Efficiency and threshold do a lot of the work.
- Lactate threshold
The intensity at which blood lactate begins climbing sharply.
ReferenceCommonly 75–90% of maximal heart rate, and higher in trained endurance athletes.
- Estimated max heart rate
The '220 minus age' figure printed on gym equipment.
ReferenceThe estimate carries a standard deviation of roughly 10–12 beats per minute.
LimitThat spread is large enough to misclassify a healthy athlete's entire training zone structure.
Evidence & metrics
The published work behind the numbers above, and the public datasets you can open to check us. If a claim can’t be traced here, we don’t print it.
Citations
Age-predicted maximal heart rate revisited
Tanaka, Monahan & Seals — Journal of the American College of Cardiology · 2001
The 220-minus-age formula is biased; 208 − 0.7 × age fits the data better, with residual scatter around 10 bpm.
ACSM's Guidelines for Exercise Testing and Prescription
American College of Sports Medicine · current edition
Establishes the reference ranges and testing protocols used for VO2max and threshold classification.
Datasets
NHANES cardiorespiratory fitness data
US Centers for Disease Control and Prevention · free
Nationally representative fitness, body composition, and activity measures.
PhysioNet exercise and cardiorespiratory recordings
MIT Laboratory for Computational Physiology · free
Open physiological signal archives including exercise ECG and gait recordings.
Still open
- How much of training response is genetically bounded versus dose-limited?
- Can non-invasive measures replace blood lactate for threshold work at scale?
- What is the real minimum effective dose of high-intensity work in a congested season?
What we won’t say
We will not present a heart-rate zone chart as personalised advice. It is an estimate wearing a lab coat.
- VO-1Evidence before wit
- VO-2Punch at claims, never at people
- VO-3Say the uncertainty out loud
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