Re: RC: Parameters

[Tivers@aol.com]

In a message dated 12/18/99 11:14:51 AM Pacific Standard Time, 
fasterhorses@gilanet.com writes:

<< Wait a minute!  One last question I'm embarrassed to be asking at this
 late date!  I "sort of" understand the definition of substrate - my
 pocket medical dictionary defines it as "compound upon which an enzyme
 acts" (I'm not sure if its a sad or good thing I have to have a
 reference book by my keyboard these days).  But were enzymes always part
 of the substrate question?  I thought we were talking about fats vs
 complex carbos vs simple carbos or something or other.  Sorry for this
 late question!  (Please use one or two syllable words in the answer!)
 Thanks, Lif
  >>

Your reference definition of substrate is a general one. In this case 
substrate refers to the specific sources of energy for muscles--fats, carbs, 
proteins and biproducts of the partial breakdown of these basic substances 
(lactic acid, for example). These are acted upon by enzymes to deliver 
energy. Substrate availability (fuel supply) is the first priority (limiting 
factor) in athletic performance. 

ti


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