| Effect of carbohydrate ingestion on exercise endurance and metabolism after a 1-day fast. | |
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MedLine Citation:
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PMID: 3246466 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Fasting before an exercise event has been demonstrated to decrease endurance. The purpose of this study was to investigate whether this decrement in performance after fasting could be reversed by ingestion of a carbohydrate solution before and during exercise. Nine fit male subjects ran to exhaustion at approximately 70% VO2max in two counterbalanced trials. The subjects were fasted for 21 h before both trials, and the trials were arranged so that the subjects ingested either a carbohydrate (CHO) or placebo (PL) solution. Although ratings of perceived exertion were significantly lower in the CHO trial, there were no differences in endurance time to exhaustion in the two trials (102 +/- 8 min in the PL trial and 106 +/- 8 min in the CHO trial). There were no differences between trials for the VO2, heart rate, and blood lactate concentrations. As expected, the blood glucose and insulin concentrations were higher in the CHO trial. The respiratory exchange ratio was significantly higher in the CHO trial at 40 min of exercise and tended to be higher at all other times, suggesting a greater reliance on carbohydrate and less on fat as an energy source. This seemed to be confirmed by the significantly lower plasma glycerol concentration, which suggested less fat mobilization in the CHO trial. Ingestion of a glucose polymer solution increased carbohydrate utilization in fasted subjects, but exercise performance was not improved. |
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Authors:
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M L Riley; R G Israel; D Holbert; E B Tapscott; G L Dohm |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: International journal of sports medicine Volume: 9 ISSN: 0172-4622 ISO Abbreviation: Int J Sports Med Publication Date: 1988 Oct |
Date Detail:
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Created Date: 1989-06-14 Completed Date: 1989-06-14 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8008349 Medline TA: Int J Sports Med Country: GERMANY, WEST |
Other Details:
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Languages: eng Pagination: 320-4 Citation Subset: IM |
Affiliation:
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Department of Biochemistry, East Carolina University, Greenville, North Carolina 27858. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Carbohydrates / pharmacology* Fasting Fatty Acids / blood Humans Male Oxygen Consumption Physical Endurance* |
| Chemical | |
Reg. No./Substance:
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0/Carbohydrates; 0/Fatty Acids |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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