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deserusan's Stats for Intra-Workout Carbohydrate Injestion In Relation to CNS Fatigue
Created:01/08/2008
Last Modified:01/08/2008
Total Comments:0



Intra-Workout Carbohydrate Injestion In Relation to CNS Fatigue

It appears that ingesting carbohydrates along with electrolytes (sodium and potassium are also in SizeON) these negative physiological processes are attenuated (5). By drinking something like SizeON you most notably limit the effects of that 5-HT has on limiting dopamine production (6) by limiting tryptophan transport into the brain (7).

5. Winnick JJ, Davis JM, Welsh RS, Carmichael MD, Murphy EA, Blackmon JA.Carbohydrate feedings during team sport exercise preserve physical and CNS function. Med Sci Sports Exerc. 2005 Feb;37(2):306-15.

6. Fernstrom JD, Fernstrom MH. Exercise, serum free tryptophan, and central fatigue. J Nutr. 2006Feb;136(2):553S-559S.

7. Davis JM, Bailey SP, Woods JA, Galiano FJ, Hamilton MT, Bartoli WP. Effects of carbohydrate feedings on plasma free tryptophan and branched-chain amino acids during prolonged cycling. Eur J Appl Physiol Occup Physiol. 1992;65(6):513-9.

Originally Posted by Peter LeDrew View Post
I thought carbs increased Tryptophan availablility in the brain?

Not during exercise, but in a resting state yes. Here is a great paper on the matter. I suggest anyone who considers dosages of intraworkout BCAA’s over 7 grams highly effective in improving performance versus carbs read this. I’m still playing devil’s advocate on the matter for what it’s worth.

J Mark Davis, Nathan L Alderson and Ralph S Welsh. Serotonin and central nervous system fatigue: nutritional considerations. American Journal of Clinical Nutrition, Vol. 72, No. 2, 573S-578s, August 2000.
Follow the debate on intra-workout nutrition here:
http://www.forum.bodybuilding.com/showthread.php?t=6479881

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