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By moving to altitude, you are exposed to lower oxygen all the time. While this approach can have a good effect on altitude acclimatization, it makes training much harder. Therefore the benefit of altitude on increased red blood cell count are offset by the reduced ability to train hard. There is also evidence that LHTH reduces muscle mass<ref name="muscle"/>.
==Live High, Train Low==
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 travelling traveling to a lower level to train. However, this approach is also possible by using a hypoxia generator to reduce the level of oxygen O<sub>2</sub> in a tent. The downside to an altitude tent is that the quality of sleep can be significantly 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 [[Intermittent Hypoxic Exposure 101]].
==Intermittent Hypoxic Training==
IHT uses lower O<sub>2</sub> concentrations than LHTH or LHTLsimilar to IHE, but for shorter periods. Typical regimes are 5 min hypoxia + 5 min normal air, repeated 6 timesunlike IHE exercise is undertaken while exposed to the low O<sub>2</sub> concentrations. See [[Intermittent Hypoxic Training]] and [[Intermittent Hypoxic Training 101]]This tends to significantly compromise training quality.
==Summary==
{| {{table}}
| LHTH||Easy if you live at altitude||Reduced training benefits, loss of muscle mass
|-
| LHTL||No detraining like unlike LHTH, no extra time taken like IHT||Requires travel or altitude tent
|-
| IHTIHE||No sleep issues like LHTL, No detraining like unlike LHTH, equipment cheap||Takes time (~1 hour/day) where activity is limited|-| IHT||No sleep issues like LHTL||Detraining as with LHTH, equipment varies and requires a treadmill for runners
|}
==See Also==
* [[Comparison of Altitude Training Systems]]
* [[Book Review – Altitude Training and Athletic Performance]]
* [[Intermittent Hypoxic TrainingExposure]] and [[Intermittent Hypoxic Training Exposure 101]]
* [[AltoLab]]
==References==
