Controlled exposure
Short lower-oxygen intervals create the challenge rather than sustained altitude or exercise.
Optimize · Oxygen Adaptation
Intermittent Hypoxic-HyperoxicTraining (IHHT).
Intermittent Hypoxic-Hyperoxic Training (IHHT) alternates lower- and higher-oxygen breathing intervals while you rest—creating a controlled, monitored physiological stimulus without exercise.
Your oxygen saturation and pulse are tracked throughout. Session parameters are selected for your response, not applied as a one-size-fits-all protocol.
At restSeated, mask-based session
MonitoredPulse and SpO₂ tracked live
CycledLower and higher oxygen intervals
IndividualParameters matched to response
Lower O₂
Pulse · SpO₂ monitored
What IHHT Is
A controlled contrast, delivered at rest.
Intermittent hypoxic-hyperoxic training uses a breathing mask to alternate air with less oxygen than room air and air with more oxygen than room air.
01
Lower Oxygen
Hypoxic interval.
A reduced-oxygen mixture is delivered while oxygen saturation and pulse are continuously monitored.
02
Higher Oxygen
Hyperoxic interval.
A higher-oxygen mixture supports reoxygenation before the next controlled lower-oxygen interval.
03
The Cycle
Exposure, then recovery.
The purpose is repeated exposure and recovery—not maximal deprivation.
Lower ⇄ Higher
Important
Published protocols vary.
Research concentrations and interval lengths are not a prescription for every person.
Lower O₂Higher O₂CycleProtocol
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Intermittent hypoxic-hyperoxic training uses a breathing mask to alternate air with less oxygen than room air and air with more oxygen than room air. The purpose is repeated exposure and recovery—not maximal deprivation.
Lower Oxygen — Hypoxic interval. A reduced-oxygen mixture is delivered while oxygen saturation and pulse are continuously monitored.
Higher Oxygen — Hyperoxic interval. A higher-oxygen mixture supports reoxygenation before the next controlled lower-oxygen interval.
Important: Published protocols vary. Research concentrations and interval lengths are not a prescription for every person.
Why It Is in Optimize
01 · Stimulus
02 · Recovery
03 · Feedback
Stress, recovery, measurement.
Optimize services are selected and sequenced around the response you are trying to improve. IHHT provides an oxygen-related stimulus while limiting joint and mechanical load.
Planned reoxygenation
Higher-oxygen intervals are used between challenges to restore saturation in a controlled cycle.
Live monitoring
Pulse and oxygen saturation help the team observe your response during the session.
What the Evidence Says
Promising signals. Mixed findings.
IHHT research is still developing. Small controlled studies—often in older or clinical populations—have reported some positive cognitive or exercise-capacity findings, while other outcomes have shown no added benefit.
2017 · Small randomized trialOlder adults
Cognition and functional exercise capacity
Geriatric patients receiving multimodal training showed greater improvement in selected cognitive tests and six-minute walk distance with IHHT than with sham exposure. The population and combined intervention limit broad application.
Read the study →2019 · Double-blind randomized trial34 completers
No added mobility or perceived-health benefit
When IHHT was added to multimodal training in geriatric patients, it did not produce additional improvement in mobility or perceived health compared with the control condition.
Read the study →2025 · Randomized trialMixed result
Vascular and cardiorespiratory measures
A small eight-week study in adults aged 60–80 reported a qualified signal in flow-mediated dilation and increased peak ventilation, with no significant changes in most other cardiorespiratory measures.
Read the study →Our standard: research informs the conversation; it does not guarantee your result. We measure what matters and reassess before deciding what continues.
Your Session
What to expect.
The exact experience depends on screening, your baseline, and your response.
01 · BEFORE
Screen and baseline
We review relevant health considerations and determine whether controlled oxygen cycling is appropriate.
02 · DURING
Rest and breathe
You sit comfortably and breathe through a mask while the system alternates oxygen conditions.
03 · THROUGHOUT
Monitor and adjust
Pulse and SpO₂ are followed throughout, with parameters managed according to your observed response.
The Optimize Framework
Measure
Match
Sequence
Re-measure
One service inside a measured plan.
IHHT is considered in the context of your goals, baseline, training load, recovery, and response.
Start with useful data
Establish the markers and real-world outcomes that matter for your objective.
Choose the right input
Determine whether IHHT belongs in your plan and screen for factors that could change that decision.
Place it deliberately
Coordinate the service with training, recovery, and other Optimize work.
Keep what earns its place
Reassess selected markers and adjust the plan based on your response.
Frequently Asked
Clear answers, without the hype.
Is IHHT the same as altitude training?
They are related, but not identical. IHHT uses short oxygen cycles while you rest and includes higher-oxygen recovery intervals.
What does a session feel like?
You remain seated and breathe through a mask. Some people notice deeper breathing, warmth, lightheadedness, or sleepiness. Tell the team immediately about discomfort.
How many sessions will I need?
There is no universal number. Studies commonly use repeated sessions across several weeks, but your schedule should reflect your goals, screening, and response.
Will IHHT improve my cognition or fitness?
Some small studies in older populations report improvement in selected measures, while others found no added benefit for specific outcomes. No study can predict your result.
Is IHHT appropriate for everyone?
No. Controlled hypoxic exposure is a meaningful physiological stressor. Relevant medical history, current symptoms, pregnancy, and cardiopulmonary considerations should be discussed during screening.
How is it different from hyperbaric oxygen?
IHHT changes oxygen concentration at normal room pressure. Hyperbaric oxygen uses increased atmospheric pressure. They are distinct services.
References
Read the research.
- Bayer U, et al. Alzheimer's & Dementia: Translational Research & Clinical Interventions (2017).
- Bayer U, et al. BMC Geriatrics 19, 167 (2019).
- Randy H, et al. Physiological Reports (2025).
Intermittent Hypoxic-Hyperoxic Training (IHHT) is offered as a wellness service and is not intended to diagnose, treat, cure, or prevent disease. Research findings may not generalize to you. Individual results vary. Participation requires appropriate screening, and this page is not medical advice.
The First Step
Start Your Upgrade.
Tell us what you want to improve. We’ll screen for suitability and determine whether IHHT belongs in your Optimize plan.
Start Your Upgrade →