Branch-Chain Amino Acids (BCAA) are often added to sports drinks for energy when glycogen stores are depleted. Research has shown that consuming BCAAs does not increase atheltic performance. Teh ingestion of protein or BCAA during exercise can increase the accumulation of ammonia form portein breakdown. A rise in blood ammonia levels can contribute to fatuge. Protein takes longer to leave the stomach than carbohyddrate. For exercises that jostle intenral organs like the stomach, protein consumption during exercise can lead to cramping and distress.
Some of this information was taken from Winning Sports Nutrition by Linda Houtkooper, PhD, RD, FACSM, Jaclyn Maurer Abbot, PhD, RD and Veronica Mullins, MS, RD, CSCS.
Disclaimer: None of the above information can be taken as a substitute for advice from a medical professional such as a physician.
My third book, Pocket Guide to Fitness, is available on www.louizapatsis.com, http://www.authorhouse.com, www.bn.com and http://www.amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories.