Apparatus for passive hypoxic training and therapy

An apparatus for providing to a user reduced-oxygen air having moisture and carbon dioxide contents in quantities equal to or higher than that of ambient air, said apparatus comprising:

• an oxygen-extraction system having an inlet taking in ambient air, and first and second outlets, said first outlet transmitting a first gas mixture having a higher oxygen content than the ambient air and said second outlet transmitting a second gas mixture having a lower oxygen content than the ambient air;
• said oxygen-extraction system comprising a compressor and a pressure-swing absorption unit, said compresser drawing ambient air through said inlet and delivering said air under pressure to said pressure-swing adsorption unit said pressure-swing absorption unit having molecular sieve adsorption material therein for adsorbing nitrogen, carbon dioxide, and water vapor from the ambient air applied thereto and permitting passage of oxygen therethrough to be released from the apparatus into the atmosphere, said pressure-swing adsorption unit releasing said retained nitrogen, carbon dioxide and water vapor into said second gas mixture for transmission to said second outlet;
• a delivery-line outlet communicating with said second outlet and receiving therefrom said second gas mixture;
• said delivery-line outlet communicating with a hypoxic gas delivery line providing said second gas mixture for inhalation by a user.