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We hypothesized that when plasma glucose availability is maintained by carbohydrate (CHO) ingestion, trained cyclists can utilize plasma glucose at very high rates during the later stages of prolonged exercise (10). To test this hypothesis, a well-trained male cyclist was studied during exercise to fatigue at 70%
A.R. Coggan is with the Exercise Physiology Laboratory at The Ohio State University, Columbus, OH 43210. R.J. Spina, W.M. Kohrt, and J.O. Holloszy are with the Section of Applied Physiology, and D.M. Bier is with the Metabolism Division, Washington University School of Medicine, St. Louis, MO 63110.