Journal of Applied Physiology
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J Appl Physiol 71: 1801-1806, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 71, Issue 5 1801-1806, Copyright © 1991 by American Physiological Society

ARTICLES

High rates of exogenous carbohydrate oxidation from starch ingested during prolonged exercise

J. A. Hawley, S. C. Dennis, B. J. Laidler, A. N. Bosch, T. D. Noakes and F. Brouns
Liberty Life Chair of Exercise and Sports Science and Medical Research Council/University of Cape Town, South Africa.

This study compared the gastric emptying and oxidation of two 15% carbohydrate (CHO) solutions: a 22-chain-length glucose polymer (GP) and soluble starch (SS). Six endurance-trained subjects ingested 1,200 ml of either GP or SS while cycling for 90 min at 70% of maximal oxygen consumption (VO2max). Whereas the calculated total CHO oxidation (GP 266.8 +/- 41.9 g; SS 263.6 +/- 28.9 g) and the volume emptied from the stomach (GP 813 +/- 130 ml; SS 919 +/- 116 ml) were similar, the appearance of the 14C label in plasma occurred more rapidly from ingested SS than from GP (P less than 0.001). This resulted in a significantly greater rate of SS oxidation than that from GP (SS 105.9 +/- 21.9 g, GP 49.6 +/- 10.2 g; P less than 0.001). Exogenous CHO oxidation from GP accounted for 19% of total CHO oxidation, whereas the corresponding value for SS was 40%. This study suggests that the oxidation of SS and GP solutions ingested during exercise at 70% VO2max is not limited by gastric emptying. Rather, it appears to be either the rate of digestion or absorption of these solutions that determines their utilization.


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[Abstract] [Full Text] [PDF]


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