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Sleeping at altitude produces the increase in red blood cells, and training at low altitude provides optimum training benefits. This effect can be achieved by literally living at a high altitude and traveling to a lower level to train. However, this approach is also possible by using a hypoxia generator to reduce the level of O<sub>2</sub> in a tent. The downside to an altitude tent is that the quality of sleep can be degraded even more than living at altitude and the equipment is expensive.
==Intermittent Hypoxic Exposure==
IHE uses lower O<sub>2</sub> concentrations than LHTH or LHTL, but for shorter periods. Typical regimes are 5 min hypoxia + 5 min normal air, repeated 6 times. See [[Intermittent Hypoxic Exposure]] and [[The Science of Intermittent Hypoxic Exposure 101]].
==Intermittent Hypoxic Training==
IHT uses O<sub>2</sub> similar to IHE, but unlike IHE exercise is undertaken while exposed to the low O<sub>2</sub> concentrations. This tends to significantly compromise training quality.
It should be noted that one of the most important conclusions of the meta-analysis is the lack of good quality studies. For instance, there were only two IHE studies for elite athletes, and one of these was flawed by providing far too low a level of hypoxia for most of the study.
==See Also==
* [[The Science of Altitude Training 101]]
* [[Comparison of Altitude Training Systems]]
* [[Book Review - Altitude Training and Athletic Performance]]
* [[Intermittent Hypoxic Exposure]] and [[The Science of Intermittent Hypoxic Exposure 101]]
* [[AltoLab]]
