Exogenous carbohydrate oxidation from maltose and glucose ingested during prolonged exercise
- PMID: 1618190
- DOI: 10.1007/BF00843762
Exogenous carbohydrate oxidation from maltose and glucose ingested during prolonged exercise
Abstract
Intestinal perfusion studies have shown that glucose absorption from maltose occurs faster than from isocaloric glucose. To determine whether ingested maltose might be a superior source of carbohydrate (CHO) for endurance athletes, we compared the rates of gastric emptying, absorption and oxidation of 15 g.100 ml-1 solutions of maltose and glucose. Six endurance-trained cyclists drank 1200 ml of either U-14C maltose or U-14C glucose as a 400-ml loading bolus immediately before exercise, and as 8 x 100-ml drinks at 10-min intervals during a 90-min ride at 70% of maximal oxygen consumption. The rates of gastric emptying [maltose 690 (SD 119) ml.90 min-1; glucose 655 (SD 93) ml.90 min-1], the appearance of U-14C label in the plasma, and the peak rates of exogenous CHO oxidation [maltose 1.0 (SD 0.09) g.min-1; glucose 0.9 (SD 0.09) g.min-1] were not significantly different. Further, the 51 (SD 8) g of maltose and the 49 (SD 9) g of glucose oxidised during exercise were similar. Each accounted for approximately 20% of the total CHO oxidised during the 90 min of exercise. Since only half of the CHO delivered to the intestine was oxidised in the 90-min ride (maltose 49%; glucose 50%), we conclude that neither the rate of gastric emptying, nor digestion limited the rate of ingested CHO utilisation during the early stages of exercise.(ABSTRACT TRUNCATED AT 250 WORDS)
Similar articles
-
Oxidation of carbohydrate feedings during prolonged exercise: current thoughts, guidelines and directions for future research.Sports Med. 2000 Jun;29(6):407-24. doi: 10.2165/00007256-200029060-00004. Sports Med. 2000. PMID: 10870867 Review.
-
Oxidation of exogenous carbohydrate during prolonged exercise: the effects of the carbohydrate type and its concentration.Eur J Appl Physiol Occup Physiol. 1992;64(4):328-34. doi: 10.1007/BF00636220. Eur J Appl Physiol Occup Physiol. 1992. PMID: 1592058
-
Oxidation of carbohydrate ingested during prolonged endurance exercise.Sports Med. 1992 Jul;14(1):27-42. doi: 10.2165/00007256-199214010-00003. Sports Med. 1992. PMID: 1641541 Review.
-
Oxidation of exogenous glucose, sucrose, and maltose during prolonged cycling exercise.J Appl Physiol (1985). 2004 Apr;96(4):1285-91. doi: 10.1152/japplphysiol.01023.2003. Epub 2003 Dec 2. J Appl Physiol (1985). 2004. PMID: 14657044
-
High rates of exogenous carbohydrate oxidation from starch ingested during prolonged exercise.J Appl Physiol (1985). 1991 Nov;71(5):1801-6. doi: 10.1152/jappl.1991.71.5.1801. J Appl Physiol (1985). 1991. PMID: 1761477
Cited by
-
Oxidation of carbohydrate feedings during prolonged exercise: current thoughts, guidelines and directions for future research.Sports Med. 2000 Jun;29(6):407-24. doi: 10.2165/00007256-200029060-00004. Sports Med. 2000. PMID: 10870867 Review.
-
Glucose kinetics during prolonged exercise in euglycaemic and hyperglycaemic subjects.Pflugers Arch. 1994 Mar;426(5):378-86. doi: 10.1007/BF00388300. Pflugers Arch. 1994. PMID: 8015888
-
Effects of glucose ingestion or glucose infusion on fuel substrate kinetics during prolonged exercise.Eur J Appl Physiol Occup Physiol. 1994;68(5):381-9. doi: 10.1007/BF00843733. Eur J Appl Physiol Occup Physiol. 1994. PMID: 8076616
-
Exercise and the oxidation and storage of glucose, maize-syrup solids and sucrose determined from breath 13CO2.Eur J Appl Physiol Occup Physiol. 1996;72(4):349-56. doi: 10.1007/BF00599696. Eur J Appl Physiol Occup Physiol. 1996. PMID: 8851905 Clinical Trial.
-
Fuel kinetics during intense running and cycling when fed carbohydrate.Eur J Appl Physiol Occup Physiol. 1996;74(1-2):36-43. doi: 10.1007/BF00376492. Eur J Appl Physiol Occup Physiol. 1996. PMID: 8891498 Clinical Trial.
References
Publication types
MeSH terms
Substances
LinkOut - more resources
Other Literature Sources
Medical
Miscellaneous