Altitude has been a talking point in sport for decades. What has changed is the precision: you no longer need weeks in an alpine valley to work with less oxygen.
Three methods, three logics
The classic is live high, train low: sleep at altitude, train at sea level. Then there is training in hypoxia — real effort in oxygen-reduced air. And finally IHHT, which is the opposite of effort: intervals at rest, hypoxia and hyperoxia alternating.
A landmark review on combining hypoxic methods makes one thing clear: the outcome depends on dose, on the point in the season and on the sport [1]. There is no single protocol that fits everyone.
- Live high: broad adaptation, but time-consuming and logistically heavy.
- Train in hypoxia: strong stimulus, demands careful load management.
- IHHT: no exertion, fits into heavy training blocks or recovery weeks.
What to expect — and what not to
The 2022 systematic review on intermittent hypoxia-hyperoxia in humans finds signals in performance and health outcomes, with the usual caveat: small groups, heterogeneous protocols [2]. For very short repeated efforts, altitude reviews describe nuanced and sometimes conflicting results [3].
In sport, IHHT competes with sleep and decent food. Those two win almost every time.
How to fit it into a plan
Treat it like any other load: planned, logged, evaluated. In intense blocks it can work as a quiet stimulus; in pre-season, as a steady series across several weeks.
- Never introduce it during competition week.
- Series of four to six weeks, two to three sessions a week.
- Log sleep, resting heart rate and perceived exertion.
If you compete or train seriously
We look at your calendar and your real training load, then decide whether IHHT adds anything in your case — or whether that time is better spent elsewhere.