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| align="center" style="background:#f0f0f0;"|'''Cons'''
|-
| Semi-permeable membrane (SPM) <ref name="semi"/>. ||Separate N2 and O<SUB>2</SUB> using a 'sieve' ||Intermittent Hypoxic Training Exposure at rest or while exercising||GO<SUB>2</SUB>Altitude||Minimal running costs, Stable 02 levels||Expensive to buy, Lower flow rates than PSAS
|-
| Pressure swing absorption<ref name="psa"/> ||Different gases are absorbed at different rates under different pressures ||Live High, Train Low, Altitude tents or altitude rooms||CAT, Hypoxico, and Higher Peak (same generator, different prices)||Minimal running costs, High flow rates at moderate O<SUB>2</SUB> concentrations||Expensive to buy, Poor performance at low O<SUB>2</SUB> concentrations
|-
| Rebreather||Use of scrubber to absorb exhaled CO<SUB>2</SUB>, which then contains less O<SUB>2</SUB> and is rebreathed||Intermittent Hypoxic Training Exposure at rest ||AltO<sub>2</sub>lab, AlitPower||Cheap to buy, Cheap to run (refilling cartridges)||Harder to control O<SUB>2</SUB> concentrations
|}
==Recommendations==
I believe that the [[AltoLab]] system is the most cost effective solution. For those wanting a sleep based system, Higher Peak offers the best value.
==Rebreathers==
Chemical generators use a chemical reaction to either remove oxygen from the air, or to remove the carbon dioxide from the air that you exhale, which is then breathed again. These systems are cheaper to purchase, but require the ongoing purchase of the chemical cartridges. These systems are only used for intermittent trainingExposure, not for sleeping.
===AltoLab===
[[AltoLab]] uses a stack of AltoMixers, with each AltoMixer diluting the oxygen to provide the equivalent of 5,000 ft. The AltoLab system also requires a CO<SUB>2</SUB> scrubber which has to be replaced and lasts 2-3 hours. The running costs would be $10-15 per hour, but you can buy the CO<SUB>2</SUB> scrubber in bulk, reducing the cost down to $1 per hour; see [[AltoLab]] for details. http://www.altolab-usa.com/
* Everest Summit, $5,550. Provides 12,500 ft, or 21,000 ft with a $200 adapter. (Looks physically identical to Higher Peak MAG-10)
* HYP123, $5,500. Provides 12,500 ft, or 21,000 ft with a $200 adapter. Upgrade to HYP100.
* HYP100, $4,700. Provides 9,000 ft, or 14,500 ft with a $200 adapter. (21,000 ft for IHT IHE with add on.)
* Conversion for use in exercise - $700
* Tents - $350+
* [[Altitude Training Approaches]]
* [[Book Review – Altitude Training and Athletic Performance]]
* [[Intermittent Hypoxic TrainingExposure]] and [[Intermittent Hypoxic Training Exposure 101]]
* [[AltoLab]]
==References==