| The influence of starch structure on glycogen resynthesis and subsequent cycling performance. | |
MedLine Citation:
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PMID: 8858410 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The present study was designed to evaluate the influence of starch structure on muscle glycogen resynthesis and cycling performance. Eight male cyclists (22 +/- 1 yr) completed an exercise protocol (DP) to decrease vastus lateralis glycogen concentration. This exercise consisted of 60 min cycling at 75% VO2max, followed by six 1-min sprints at approximately 125% VO2max with 1 min rest intervals. In the 12 hr after the exercise each subject consumed approximately 3000 kcal (65:20:15% carbohydrate, fat and protein). All of the carbohydrate (CHO) consumed was derived from one of four solutions; 1) glucose, 2) maltodextrin (glucose polymer), 3) waxy starch (100% amylopectin), or 4) resistant starch (100% amylose). Muscle biopsies were taken from the vastus lateralis muscle after DP and 24 hr later to determine glycogen concentrations. A 30 min cycling time trial (TT) was performed following the 24 hr post-DP muscle biopsy to examine the influence of the feeding regimen on total work output. The post-DP glycogen concentrations were similar among the four trials, ranging from 220.3 +/- 29.2 to 264 +/- 48.3 mmol.kg-1 dry weight (d.w.) muscle. Twenty-four hours after DP, muscle glycogen concentration had increased less (p < 0.05) in the resistant starch trial (+90.8 +/- 12.8 mmol.kg-1 d.w.) than in the glucose (+197.7 +/- 31.6 mmol.kg-1 d.w.), maltodextrin (+136.7 +/- 24.5 mmol.kg-1 d.w.) and waxy starch (+171.8 +/- 37.1 mmol.kg-1 d.w.) trials. There were no differences in total work output during the TT, or blood lactate concentration immediately following the TT in any of the CHO trials. In summary, glycogen resynthesis was attenuated following ingestion of starch with a high amylose content, relative to amylopectin or glucose; however, short duration time trial performance was unaffected. |
Authors:
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A C Jozsi; T A Trappe; R D Starling; B Goodpaster; S W Trappe; W J Fink; D L Costill |
Publication Detail:
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Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: International journal of sports medicine Volume: 17 ISSN: 0172-4622 ISO Abbreviation: Int J Sports Med Publication Date: 1996 Jul |
Date Detail:
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Created Date: 1997-01-13 Completed Date: 1997-01-13 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8008349 Medline TA: Int J Sports Med Country: GERMANY |
Other Details:
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Languages: eng Pagination: 373-8 Citation Subset: IM; S |
Affiliation:
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Human Performance Laboratory, Ball State University, Muncie, Indiana 47306, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Amylopectin
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metabolism Amylose / metabolism Analysis of Variance Bicycling / physiology* Exercise / physiology* Exercise Test Glucose / metabolism Glycogen / analysis, biosynthesis* Humans Lactic Acid / blood Male Muscle, Skeletal / chemistry Polysaccharides / metabolism Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Polysaccharides; 50-21-5/Lactic Acid; 50-99-7/Glucose; 9005-79-2/Glycogen; 9005-82-7/Amylose; 9037-22-3/Amylopectin; 9050-36-6/maltodextrin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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