IHHT (hypoxia-hyperoxia training)
Morning · 05:25
Intermittent hypoxia-hyperoxia training: breathing alternating low- and high-oxygen air through a mask, commonly explored for mitochondrial and cardiovascular conditioning. Protocols vary and practitioners typically work with providers.
Quick facts
- 1IHHT alternates breathing low-oxygen and high-oxygen air through a mask across a session, simulating altitude intervals.
- 2The protocol comes from altitude-training and cardiac-rehab research lineages.
- 3Small trials report mitochondrial and cardiovascular adaptation markers; the field is young.
Why people do it
Altitude training, seated: The pitch is hypoxic adaptation stimulus without mountains or exertion, attractive for recovery days.
Mitochondrial signaling: Intermittent hypoxia is a genuine stressor with documented cellular responses; magnitude in healthy users is the open question.
Passive format: Sessions are 40-ish minutes in a chair, which is why time-rich optimizers slot it easily.
Good to know
Provider-dependent: Equipment quality and protocol design vary; this is practiced through clinics and trained providers, not improvised.
Early evidence: Promising small studies, no large outcome trials; costs are substantial for the certainty available.
Common questions
Is this the same as altitude masks?+
No; training masks restrict airflow without changing oxygen fraction. IHHT actually alters inspired oxygen.
Who typically uses it?+
Longevity clinics offer it for cardiovascular and metabolic conditioning, often to people who already train conventionally.
Takeaway
Altitude intervals from an armchair: legitimate physiology, boutique evidence, clinic prices. An experiment for the already-optimized.
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These habits are compiled from public statements and are not medical advice or endorsed by Bryan Johnson. Consult a qualified professional before changing your routine, supplements, or therapies.