Source 145: The following quotes come from the NORMALBREATHING.com website; accessed Jan.7 2015 at: http://www.normalbreathing.com/causes-of-hyperventilation and http://www.normalbreathing.com/refer-table-normals. These links may or may not still be operational; if it isn't, we may have redirected it to the WayBackMachine archive.
‘Modern people breathe about 2-3 times more air’ than humans did ‘only 70-80 years ago’
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The following references also appear with yellow highlight below, and may be accessed in full here: Griffith et al, 1929; Shock et al, 1939; Matheson et al, 1950. Relevant data within the references is also highlighted.
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