| 摘要 |
A breathing apparatus (10) including a mouthpiece (13) and a carbon dioxide removal area (18) disposed between the mouthpiece and an air reservoir chamber (19). The chamber is preferably filled with a foam material and is further in communication with ambient air (29) to enable mixing with expired air within the chamber (19). The breathing apparatus (10) is useful for simulating the lower partial pressure of oxygen at high altitude, hence it may be used by athletes for simulating "living at altitude".
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