| Influence of muscle glycogen depletion on the rate of resynthesis. | |
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MedLine Citation:
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PMID: 1900096 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In an effort to determine what effect the degree of muscle glycogen depletion has on the rate of resynthesis, six male cyclists completed an exercise protocol that involved both one- and two-legged cycling. One leg completed 30 min of single-leg cycling, ten one-min sprints, and 30 min cycling with both legs. This resulted in a large degree of depletion (LD). The contralateral leg completed only 30 min of double-leg cycling and experienced a small amount of depletion (SD). Following the exercise, the subjects rested quietly for 6 h and were fed a 24% carbohydrate (CHO) solution every 20 min in order to achieve a CHO intake of 0.7 g.kg-1.h-1. Biopsies taken from the vastus lateralis muscle immediately after exercise revealed that the glycogen content of the LD leg decreased 93.9 (+/- 11.6) mmol.kg-1 w.w., whereas the SD leg used 49.3 (+/- 5.7) mmol.kg-1 w.w. (P less than 0.01). Subsequent biopsies taken at 2 and 6 h of recovery demonstrated that the rate of muscle glycogen resynthesis was significantly greater in the LD leg, averaging 8.8 (+/- 2.4) mmol.kg-1.h1 w.w, while the SD leg restored glycogen at a rate of 3.0 (+/- 1.0) mmol.kg-1.h-1 w.w. (P less than 0.05). Glycogen synthase activity, expressed as its activity ratio (I/D), was also greater (P less than 0.01) in the LD leg both immediately after exercise (0.45 +/- 0.05 vs 0.24 +/- 0.04) and at 2 h of recovery (0.54 +/- 0.06 vs 0.27 +/- 0.06).(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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J J Zachwieja; D L Costill; D D Pascoe; R A Robergs; W J Fink |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 23 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 1991 Jan |
Date Detail:
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Created Date: 1991-04-04 Completed Date: 1991-04-04 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 44-8 Citation Subset: IM; S |
Affiliation:
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Human Performance Laboratory, Ball State University, Muncie, IN 47306. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Analysis of Variance Blood Glucose / metabolism Exercise / physiology* Glycogen Synthase / biosynthesis*, metabolism Humans Lactates / blood Lactic Acid Leg Male Muscles / metabolism* Phosphorylation |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Lactates; 50-21-5/Lactic Acid; EC 2.4.1.11/Glycogen Synthase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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