A week or so ago I posted a comment on using supplemental oxygen while exercising (EWOT). In the body of the discussion I referred to the employment of "nasal-type" oxygen masks. I would like to take this opportunity to clarify the effectiveness of this type of device. The little "nose-type" oxygen fitting utilized in most hospitals "WAS NOT" an acceptable variation. It looks good on television, but is almost useless for achieving the desired results for EWOTAdditionally, the best results....by far.....resulted from the use of non-rebreathing type masks. Additionally, I did not elaborate on, exactly, how we achieved the highest levels of O2 availability. The reason for this was because....in a controlled laboratory setting, you can do many things not practical otherwise. e.g. Being able to modify the equipment without attendant dangers to the volunteer, etc. My recommendation to other researchers/experimenters is to utilize the "bag-type" rebreather mask and DO NOT close the safety vent (although this would result in 100% Fl 02.). Sincerely, Brooks Bradley.
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