Originally posted by rubyming
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The short answer for endurance exercise might be a drink high in carbohydrates and lower in proteins with a good compliment of electrolytes (your smoothie is probably a good pre and during exercise drink, post exercise I use no fat chocolate milk). For strength training you might want a post exercise drink high in protein (your smoothie with a scoop or two of whey or soy protein thrown in or my chocolate milk with the same protein powder added).
I think the bottom line in all of it is how it affects your ability to recover (unload the fatigue) and your ability to enter the next exercise period. If you find yourself excessively fatigued or unwilling to engage in your next exercise period, you might want to try changing something up.
I am also very interested in your question and am actively searching for a general nutritional guide to successful ultra-endurance exercise, in case anyone out there is aware of such thing.
Interestingly, there were a couple of articles related to this in the ACSM journal this month, if you can get through the rather dense terminology.
http://journals.lww.com/acsm-msse/pages/currenttoc.aspx
Good Luck,
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