IHHT (intermittent hypoxic-hyperoxic training) is a non-invasive therapy that has you breathe alternating low-oxygen and high-oxygen air through a mask while you rest. By gently challenging the body the way high altitude does, IHHT therapy at Imvitra aims to renew your cells from the inside and help your energy systems work more efficiently.
This guide explains what IHHT is, how it works, the benefits people look for, and what to expect from a session.
IHHT stands for intermittent hypoxic-hyperoxic training. During a session you sit or lie down and breathe through a comfortable mask connected to a device that switches between two kinds of air. First comes hypoxic air, which contains less oxygen than normal and mimics the thin air of a mountain. Then comes hyperoxic air, which is oxygen-enriched and supports recovery between the low-oxygen phases.
This guide explains what IHHT is, how it works, the benefits people look for, and what to expect from a session.
What is IHHT?
The whole process is passive. You do not exercise and you do not need any special preparation. A typical session lasts roughly 30 to 45 minutes, and the device controls every phase automatically based on your response.
IHHT stands for intermittent hypoxic-hyperoxic training. During a session you sit or lie down and breathe through a comfortable mask connected to a device that switches between two kinds of air. First comes hypoxic air, which contains less oxygen than normal and mimics the thin air of a mountain. Then comes hyperoxic air, which is oxygen-enriched and supports recovery between the low-oxygen phases.
The whole process is passive. You do not exercise and you do not need any special preparation. A typical session lasts roughly 30 to 45 minutes, and the device controls every phase automatically based on your response.
How does IHHT work?
The idea behind IHHT is simple. Short, controlled bursts of low oxygen send a signal to your body that it needs to adapt. That signal reaches the mitochondria, the tiny structures inside your cells that turn oxygen and nutrients into usable energy. Healthy mitochondrial function is one of the foundations of feeling energetic, and it tends to decline with age, stress, and illness.
During the hypoxic phase, weaker or damaged mitochondria struggle to keep up. The body responds by clearing out underperforming cells and stimulating the healthy ones to multiply and work better. The hyperoxic phase that follows floods the system with oxygen so recovery happens quickly and the next low-oxygen cycle can begin. Repeating this contrast over several sessions is what gives IHHT its training effect, much like interval training does for muscles.
The benefits of IHHT
People turn to IHHT therapy for a range of reasons. The most commonly reported benefits include:
More energy and less fatigue
A reduction in the heavy, drained feeling that comes with long-term tiredness.
Better stress resilience and sleep
A calmer nervous system, improved sleep quality, and faster recovery after exertion.
Support for cellular health
A gentle boost to mitochondrial function, metabolism, and overall stamina without intense physical effort.
It is important to be realistic. IHHT is a supportive therapy and results vary from person to person. It is not a cure, and it works best as part of a wider approach to health that includes good sleep, nutrition, and movement.
What can IHHT help with?
Because IHHT targets the cellular energy systems rather than a single symptom, it is often used alongside care for conditions where fatigue plays a central role.
Chronic fatigue
Many people exploring IHHT are dealing with long-term tiredness that does not improve with rest. The cellular focus of IHHT makes it an interesting option to support energy recovery.
Post-viral complaints and long covid
Lingering exhaustion after illness is a frequent reason people look into hypoxic-hyperoxic training, since it gently retrains how the body handles oxygen.
Burn-out and high stress
The calming, low-effort nature of a session can fit well into a recovery routine for people who feel mentally and physically depleted.
Athletic recovery and performance
Athletes have long used altitude effects to build endurance, and IHHT offers a controlled, indoor version of that stimulus.
Healthy ageing
Supporting mitochondrial function is one of the reasons IHHT appeals to people focused on long-term vitality.
If you have a medical condition, always discuss IHHT with your doctor before starting.
What does an IHHT session look like?
A session is relaxed and undemanding. You arrive, settle into a comfortable chair, and put on the breathing mask. A small sensor on your finger measures your blood oxygen and heart rate throughout, so the device can adjust the oxygen levels to your personal response.
You simply breathe normally. Most people read, listen to music, or close their eyes. The alternating phases of thin and oxygen-rich air continue for the length of the session, and you can stop at any time. Afterwards you can return to your day right away, since there is no recovery period needed.
For lasting results, IHHT is usually done as a series of sessions spread over several weeks rather than a one-off visit. You can book an IHHT session at Imvitra to discuss a plan that fits your goals.
IHHT compared to altitude training and hyperbaric oxygen therapy
IHHT is sometimes confused with two other approaches, but they are not the same.
Altitude training relies on staying in genuinely thin air, either in the mountains or in a low-oxygen tent, for long stretches. IHHT delivers a similar low-oxygen stimulus in short, precise intervals during a single session, with oxygen-rich recovery built in.
Hyperbaric oxygen therapy (HBOT) does the opposite of the hypoxic part of IHHT. It places you in a pressurised chamber and saturates the body with extra oxygen. IHHT instead uses the contrast between low and high oxygen to create its training effect, and it does not require any pressure chamber.
Is IHHT safe, and who is it for?
For most healthy adults, IHHT is considered a gentle and well-tolerated therapy. Because the oxygen levels are monitored in real time and adjusted to you, the low-oxygen phases stay within a comfortable range.
That said, IHHT is not suitable for everyone. People with certain heart or lung conditions, acute infections, or who are pregnant should avoid it or only proceed after medical clearance. A reputable provider will always screen you beforehand and explain what to expect.
Trying IHHT at Imvitra in Maastricht
At Imvitra in Maastricht we guide you through IHHT in a calm, personal setting, with every session tailored to your own response. If you are curious whether IHHT could support your energy and recovery, we are happy to talk it through and answer your questions.
Most sessions last about 30 to 45 minutes, including the time to set up the mask and sensor.
Results build over time, so IHHT is usually done as a course of multiple sessions across several weeks. The exact number depends on your goals and how you respond.
No. You simply breathe through a mask while resting. The low-oxygen phases feel similar to being at a moderate altitude and are kept comfortable.
Yes. Many people use IHHT not to treat a condition but to support everyday energy, recovery, and resilience.
