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The most powerful
physiological stimulus that exists.

Hypoxia is not just a training tool, it is one of the most powerful physiological stimuli to improve human performance. Here is the science that supports it.

2019 Nobel Prize in Medicine

When oxygen deficiency becomes an advantage

In 2019, the Nobel Prize recognised how cells detect and adapt to oxygen deficiency, a key mechanism for improving O₂ transport, use and efficiency in the body. Based on this principle, hypoxia training allows these adaptations to be activated in a controlled way, generating real improvements in performance, recovery and metabolic efficiency.

2019 Nobel Prize in Medicine
William Kaelin, Peter Ratcliffe and Gregg Semenza
William Kaelin · Peter Ratcliffe · Gregg Semenza

+VO₂max

Greater maximum aerobic capacity

Peer-reviewed studies confirm the increase in VO₂max following hypoxia protocols, both in HIIT sessions and passive exposure at simulated altitude.

Study
Intervention type
Duration
VO₂max increase
StudyPark et al., 2016
Intervention typeMeta-analysis (hypoxia vs control)
DurationVariable
VO₂max increase+1.64 ml/kg/min
StudyFentaw et al., 2025
Intervention typeHIIT in hypoxia
DurationVariable
VO₂max increase+4.4% to +13%
StudyCzuba et al., 2013
Intervention typeHIIT in hypoxia
Duration3 weeks
VO₂max increase+6.5% to +7.8%
StudyDragoș et al., 2022
Intervention typeLHTH / LHTH+
Duration30 days
VO₂max increase+0.9 to +1.7 ml/kg/min
StudyBahenský & Grosicki, 2021
Intervention typeAltitude + HRV
Duration2 weeks
VO₂max increase+2.8 ml/kg/min (~4.3%)
StudySaugy et al., 2016
Intervention typeLHTL
Duration18 days
VO₂max increase+3.2% to +4.9%

+Lactate threshold

More watts without accumulating fatigue

Sustain higher intensities for longer. Lactate threshold is one of the most reliable predictors of endurance performance.

Study
Duration
Type
Improvement
StudyTurner et al., 2022
Duration4 weeks
TypeHIIT
Improvement+6.1% LT / +5.4% LTP
StudyWarnier et al., 2020
Duration6 weeks
TypeLHTH
Improvement+12 to +14 W at LT
StudyCzuba et al., 2017
Duration4 weeks
TypeHIIT
Improvement+6.7% to +9.1%
StudyHuang et al., 2015
DurationMulti-year
TypeChronic
Improvement+13.2 W at LT power
StudyChen et al., 2018
Duration4 weeks
TypeHIIT
Improvement+3% speed at AT
StudySellés-Pérez et al., 2024
DurationSeason
TypeLHTH
Improvement+2.6% to +4.0% speed at LT2

Red blood cells

Study
Duration
Hb / erythrocyte mass increase
Duration3–4 weeks
Hb increase+3.2% to +6.2% Hbmass
Duration~3–4 weeks
Hb increase+3.8% to +4.1% Hb
Duration9–28 days
Hb increase+3.7% Hbmass
Duration~3 weeks
Hb increase+3.4% Hbmass
Duration7–16 days
Hb increase+3.7% → +7.6% Hbmass
Duration16 days
Hb increase+5.4% Hbmass (range −3.9 to +20.2%)
Duration~6 accumulated weeks
Hb increase+3.25% Hbmass
Duration4 weeks
Hb increase+1.8% Hbmass
DurationChronic (living at altitude)
Hb increase~+7% Hbmass

More EPO

Study
Duration
EPO increase
Duration1 day / 26 days
EPO increase+3.3x (day 1) → +1.5x sustained
Duration4 h exposure
EPO increase+10% to +185%
Duration12 h
EPO increase+142% approx. (4.17 → 10.12 mU/mL)
Duration2 h exposure
EPO increase+35% to +48%
Duration2 h
EPO increase+25% approx. (19.3 → 24.1 mU/mL)
Duration48 h
EPO increaseEarly significant peak (no exact %) accompanied by ↓ sEpoR
+25% to +185%

Endogenous EPO

Hypoxia naturally elevates endogenous erythropoietin. Peak in hours, sustained in days.

Friedmann · Turner · Mackenzie
+3.2% to +7.6% Hbmass

Red blood cells

More hemoglobin mass = more O₂ transport to muscles. Lasting adaptation after 3-4 weeks.

Heikura · Ryan · Mujika
PGC-1α · AMPK ↑

Mitochondrial efficiency

Mitochondrial biogenesis and density. More cellular "engines" and better energy efficiency in each fiber.

Saxena · Scott · Aragón-Vela