Re: RC: Expired gases on treadmill

[Tivers@aol.com]

In a message dated 12/27/99 3:07:36 PM Pacific Standard Time, 
guest@endurance.net writes:

<< Blood gases are representative of what is happening metabolically, not 
only of lun=
 g function.  By comparing the O2 left in expired air to the O2 in room air 
you can calculate how much O2 is consumed.  As=
  anaerobic metabolism increases, lactate is buffered by the bicarbonate 
buffering system, which has as its end products C=
 O2 and H2O.  Only carbs can be used anaerobically, so when the ratio of 
expired CO2:O2 is equal or greater to 1.0 the sub=
 strate being used is 100% carbs.  A ratio of 0.7 CO2:O2 is accepted as 
representing fat as the sole source of substrate. =
  Formulas exist which allow you to calculate the percentage of fat and carb 
when the respiratory exchange ratio is any wh=
 ere between 0.7 and 1.0, but I am at home and do not have access to the 
texts.  If you are interested you could probably =
 find the equations by searching Medline. >>


Thank. You. Beth! Just in the nick of time. Needed that info desperately.

ti  


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