Hyperbaric oxygen (HBOT) — The Hypoxic Paradox
Hyperbaric oxygen therapy (HBOT) involves breathing 100% oxygen in a pressurized chamber, traditionally used for wound healing and decompression sickness. In longevity medicine, specific intermittent HBOT protocols are utilized to induce the 'hypoxic paradox', triggering cellular regeneration, angiogenesis, and senolytic effects.
Mechanism of Action
HBOT operates via the 'hypoxic paradox', where intermittent exposure to hyperoxia followed by a rapid return to normoxia mimics hypoxia at the cellular level without actual oxygen deprivation. This fluctuation stabilizes Hypoxia-Inducible Factor 1-alpha (HIF-1α), which upregulates vascular endothelial growth factor (VEGF) and promotes angiogenesis. It also stimulates mitochondrial biogenesis, enhances stem cell mobilization, and exerts senolytic effects by clearing senescent immune cells and promoting telomere elongation.
Human Trial Evidence
Multiple prospective trials in healthy aging adults demonstrate that specific HBOT protocols can increase telomere length in immune cells by over 20% and decrease senescent T-cell populations by up to 37%. Additional randomized controlled trials show significant improvements in cognitive function, particularly attention and processing speed, alongside increased cerebral blood flow.
Dosing Protocol
60 daily sessions of 90-120 minutes at 2.0 ATA, breathing 100% oxygen with 5-minute air breaks every 20 minutes. This specific intermittent hyperoxia protocol is required to trigger the hypoxic paradox and regenerative effects.
Safety & Contraindications
Generally safe when administered by trained professionals. Potential adverse effects include middle ear barotrauma, sinus squeeze, and temporary myopia. Contraindicated in untreated pneumothorax and concurrent use of certain chemotherapeutics (e.g., bleomycin, doxorubicin). Seizures due to central nervous system oxygen toxicity are rare but possible.