Many patients who come to our Vitamin Institute in Munich have heard of altitude training – and ask themselves: is IHHT simply altitude training with a mask? The answer is no. While IHHT and traditional altitude training share the same trigger mechanism – oxygen deprivation – they differ fundamentally in their mechanism, safety, control, and field of application. This article explains what you need to know.
What is IHHT – and how does it differ from traditional altitude training?
In traditional altitude training, athletes travel to regions above 2,000 metres – such as the Alps or Kenya – to train there for several weeks. The reduced partial pressure of oxygen forces the body to adapt: more red blood cells, more haemoglobin, and more efficient muscle function. Professionals in endurance sports such as triathlon, cycling, or running have been using this effect for decades.
Intermittent Hypoxia-Hyperoxia Therapy (IHHT) uses the same biological stimulus – but in a controlled, precisely dosed way and without physical exertion. Through a breathing mask, the device alternates in short intervals between oxygen-reduced air (hypoxia, approx. 9–15% O₂) and oxygen-enriched air (hyperoxia, 30–40% O₂). Blood oxygen saturation is continuously measured, and the protocol is adjusted in real time.
At first glance, this may sound similar – but it is not. The decisive difference lies in four points: control, safety, accessibility, and cellular precision. During altitude training at 3,000 metres, there is no way to regulate the oxygen stress. The body is exposed to it – with all the associated risks. In IHHT, the stimulus is dosed precisely to the threshold at which it has a therapeutic effect, without overloading the system.
What do hypoxia and hyperoxia mean?
Hypoxia (from the Greek hypo = under) refers to an insufficient supply of oxygen to the body – as naturally occurs at high altitudes. Hyperoxia (from the Greek hyper = over) is the opposite: an increased concentration of oxygen in the air being breathed. IHHT uses the deliberate alternation between these two states to trigger specific healing and regeneration processes in the body.
The mechanism of action: what happens in the body?
To understand the difference, it is important to know what happens inside the cells – and why the sequence of hypoxia and hyperoxia is so crucial.
The role of the mitochondria
Mitochondria are the powerhouses of every cell in the body. They produce ATP – the body’s universal energy currency. With increasing age, chronic stress, lack of sleep, inflammation, or illnesses such as Long COVID, mitochondria lose their efficiency. Damaged, dysfunctional mitochondria produce less energy while generating more free radicals – a vicious cycle that promotes exhaustion, weakened immunity, and accelerated ageing.
This is exactly where IHHT comes in. The targeted lack of oxygen puts damaged mitochondria under stress – they cannot withstand this stimulus and are broken down and recycled through the body’s own process of mitophagy. At the same time, the therapy stimulates the formation of new, healthy, high-functioning mitochondria. This is not a trick – it is cellular regeneration.
Mitophagy
Targeted elimination of damaged mitochondria through oxygen-mediated stress – making room for new, efficient cellular powerhouses.
Mitochondrial renewal
After elimination, new mitochondria are formed – with higher energy production and improved resistance to stress.
Parasympathetic activation
The alternation from hypoxia to hyperoxia activates the body’s resting nerve – with immediately noticeable relaxation, better sleep, and mental clarity.
EPO & red blood cells
As with altitude training, the body releases its own erythropoietin – improving oxygen transport in the blood.
Why is the hyperoxia phase necessary?
This is one of the most common questions patients ask us at our practice for individual therapies in Munich. If hypoxia is the actual active stimulus, why add oxygen afterwards?
The answer is therapeutic safety and enhanced effect. The body interprets the sudden rise after a hypoxia phase as a signal that the acute stress is over. This activates the parasympathetic nervous system – the body’s relaxation response – disproportionately strongly. It is this so-called rebound effect that makes IHHT so effective for the autonomic nervous system. In addition, the hyperoxia phase limits the risk of an undesired excessive drop in oxygen saturation and makes the therapy well tolerated for a broad group of patients – even without athletic fitness.
HIF-1α: The Nobel Prize mechanism behind the therapy
Nobel Prize in Medicine 2019
Scientists William Kaelin Jr., Gregg Semenza, and Peter Ratcliffe were awarded the 2019 Nobel Prize in Medicine for the discovery of hypoxia-inducible factor HIF-1α. This transcription factor is the molecular core mechanism behind the effects of IHHT.
HIF-1α is a sensor that every human cell possesses. When the oxygen level in the cellular environment falls below a critical threshold, this factor detaches from the cell surface, moves into the cell nucleus, and activates up to 200 different genes there. The processes triggered are remarkable:
- Antioxidant enzymes (including NRF1) are upregulated – free radicals are neutralised
- Autophagy is activated – dysfunctional cells are broken down and recycled
- Angiogenesis is promoted – new capillaries sprout, and circulation improves
- Neurotransmitter production increases – mood-enhancing signalling substances are produced in greater amounts
- Fat metabolism is reprogrammed – greater fat burning, less dependence on sugar
- Inflammatory markers decrease – chronic inflammatory processes are reduced
- Telomere stabilisation – potentially slower cellular ageing
In traditional altitude training, HIF-1α is also activated – but in an uncontrolled way, over days and weeks, without a feedback loop. IHHT uses exactly the same molecular switch, but in a controlled, precisely dosed form that is equally suitable for both ill and healthy individuals.
— Dr Simone Eichinger, Vitamin Institute Munich
“Each of our cells is equipped with a highly precise oxygen sensor. IHHT deliberately uses this evolutionarily ancient mechanism to initiate healing processes that no medication can achieve as efficiently.”
Direct comparison: IHHT vs. traditional altitude training
Here, you can see at a glance how the two approaches differ in concrete terms – and why IHHT is the superior option for most people:
| Criterion | IHHT | Traditional Altitude Training |
|---|---|---|
| Oxygen control | ✓ Precise, in real time – continuous measurement of blood oxygen saturation | ✗ No control – the body is exposed to the surrounding pressure |
| Physical strain | ✓ None – fully passive, lying down or seated | ✗ High – training at altitudes of 2,000–4,000 m required |
| Accessibility | ✓ Suitable for everyone – regardless of fitness, age, or illness | ✗ Only for trained individuals – physical fitness is a basic requirement |
| Adaptation period | ✓ Initial improvements can often be felt from session 5–7 onwards | ~ 10–14 days before the actual training phase begins |
| Hyperoxia phase | ✓ Integrated – increases safety and enhances the parasympathetic effect | ✗ Not included |
| Mitochondrial effect | ✓ Targeted – damaged mitochondria are selectively eliminated | ~ Present, but cannot be controlled in a targeted way |
| Autonomic nervous system | ✓ Direct effect on the parasympathetic nervous system – immediate relaxation | ✗ Tends to activate the sympathetic nervous system through physical strain |
| Risk of altitude sickness | ✓ No risk – normal pressure, no pressure changes | ✗ Possible – especially with rapid ascent |
| Suitable in case of illness | ✓ Yes – Long COVID, burnout, cardiovascular disease (with medical supervision) | ✗ Contraindicated in most chronic illnesses |
| Combination with therapies | ✓ Ideal – can be combined with infusion therapies, NAD+ infusions, and more | ~ Limited due to logistical effort |
| Time commitment | ✓ 30–60 min, 2–3 times per week, in our Munich practice | ✗ 3–4 weeks at a training camp, with considerable travel effort |
Who is IHHT suitable for – and who is it not suitable for?
One of the greatest advantages of IHHT compared with traditional altitude training is its broad range of applications. In our IHHT programme in Munich, we treat both competitive athletes and chronically ill patients – a combination that would be unthinkable with traditional altitude training.
Suitable for
- Chronic exhaustion & burnout
- Long COVID & post-COVID fatigue
- Cardiovascular disease*
- Sleep disorders
- Type 2 diabetes mellitus
- Asthma & COPD (stable)*
- Migraine & headaches
- Weakened immune system
- Regeneration in competitive sports
- Preventive longevity medicine
- Neurodegenerative diseases*
Contraindicated in
- Acute cancer
- Pregnancy
- Acute infections / fever
- Epilepsy / acute neurological disease
- Schizophrenia / acute mania
- Acute heart attack
- Acute stroke
- Polycythaemia
- Glaucoma / increased intraocular pressure
* In these conditions, medical supervision and an individually tailored, moderate protocol are required. Would you like to know whether IHHT is suitable for your situation? We would be happy to advise you in a personal initial consultation.
Scientific evidence: what does the research say?
The history of research into hypoxia therapy dates back to the 1970s. At first, pure oxygen deprivation was studied, followed in the 1980s by the opposite approach using hyperoxia. Since the mid-1990s, the intermittent protocol – alternating between less oxygen and more oxygen – has proven to be the most effective. More than 50 years of research support this principle.
The molecular basis has been scientifically undeniable since the Nobel Prize in 2019. The HIF-1α signalling pathway is one of the best understood cellular mechanisms in medicine. Where the evidence base is still growing is in clinical endpoints: in some areas, large randomised double-blind studies are still lacking – which is not surprising given the logistical complexity of such studies and the difficulty of blinding hypoxia effects.
What does exist, however, are numerous clinical observational studies, cohort studies, and reports from high-level sports medicine practice – including professional football (Bundesliga, Premier League) and endurance sports. This body of evidence is sufficient to classify IHHT as a therapeutic option with a strong safety profile and a plausible mechanism of action.
As part of our scientifically grounded therapeutic approach at Vitamin Institute Munich, we use IHHT in a targeted and individualised way – complemented by nutrient and supplement testing to create the optimal conditions for mitochondrial regeneration.
How does an IHHT session work at our practice?
Many of our patients are surprised by how simple and pleasant the therapy is. Here is a typical session flow at our IHHT centre in Munich:
1
Initial medical consultation & medical history
We review your medical history, clarify any contraindications, and define your individual treatment goal – whether regeneration, exhaustion, prevention, or performance enhancement.
2
Hypoxia test: your individual profile
The device performs an initial test to determine at which oxygen concentration your blood oxygen saturation drops below 90%. This value defines your personal protocol.
3
Analysis of the autonomic nervous system
Before and after the session, we measure your sympathetic-parasympathetic status in order to document the effect of the therapy on your autonomic nervous system.
4
The therapy session: 30–60 minutes of relaxation
You lie down comfortably, put on the breathing mask, and relax. The device automatically alternates between hypoxia and hyperoxia phases. No physical effort, no exertion – many patients even fall asleep during the session.
5
Treatment series: 10–20 sessions, 2–3 times per week
Many patients report initial improvements from session 5–7 onwards. A complete treatment series includes 10–20 sessions. For optimal long-term effects, we recommend 2–3 series per year.
To support the newly formed mitochondria as effectively as possible, we also recommend targeted micronutrient support. Our infusion therapies – including NAD⁺ infusions, which directly support mitochondrial function – as well as our signature treatments are ideally aligned with IHHT. Our nutrient and supplement tests show exactly which nutrients your body specifically needs.
Conclusion: when is IHHT worthwhile – and when is altitude training enough?
Traditional altitude training is a proven method for healthy, well-trained athletes who want to improve their endurance performance and prepare for expeditions or competitions at high altitude. It is effective – but it requires certain prerequisites, takes considerable time, and is hardly suitable for people with medical conditions.
IHHT is something different. It is not a sports programme – it is a medical therapy that uses the same cellular mechanism in a precise and safe way. It requires no mountains, no fitness, and no physical exertion. What it does require is patience, consistency, and – in the case of pre-existing conditions – medical supervision.
For those who suffer from chronic exhaustion, burnout, Long COVID, sleep disorders, or the general feeling of no longer functioning at their full capacity, IHHT is one of the most promising therapeutic options in modern preventive and regenerative medicine. And for healthy individuals who want to support their cellular health in the long term, it is an intelligent complement to an active lifestyle.
Would you like to find out whether and how IHHT fits into your individual health plan? Read more about our range of services or visit our holistic health page. Our team is always available for a personal consultation.
IHHT in Munich – Book your consultation now
Dr Simone Eichinger and the team at Vitamin Institute Munich support you individually throughout your IHHT therapy – scientifically grounded and precisely tailored.
Dr Simone Eichinger – Vitamin Institute Munich
Dr Eichinger is a physician and the founder of Vitamin Institute Munich, specialising in preventive medicine, mitochondrial health, and regenerative therapies. She supports patients with IHHT, infusion therapies, and individual health programmes. Learn more about Dr Eichinger →
Further topics from our institute
NAD⁺ infusions in Munich – mitochondrial support at the cellular level
Strengthen your immune system – how IHHT and micronutrients work together
Our therapies at a glance – individual, scientifically grounded, effective