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Anaesthesia. 2011 May;66(5):348-53. doi: 10.1111/j.1365-2044.2011.06698.x. Epub 2011 Mar 28.

A novel ambulatory closed circuit breathing system for use during exercise.

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UCL Centre for Altitude Space and Extreme Environment Medicine, UCL Institute of Child Health, University College London, London, UK.


We describe a unique ambulatory closed circuit for delivering high fractions of inspired oxygen to an exercising user who does not require isolation from their environment. We describe the major components and their function and suggest potential applications for such a circuit. This circuit may benefit patients who are chronically dependant on oxygen, are unable to exercise due to hypoxia, or require oxygen supplementation at high altitude.

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