| Effects of exercise intensity and duration on fat metabolism in trained and untrained older males. | |
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MedLine Citation:
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PMID: 17724610 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Advancing age is associated with changes in fat and carbohydrate (CHO) metabolism, which is considered a risk factor for cardiovascular disease and diabetes. The effects of exercise intensity and duration on fat and CHO metabolism in elderly male subjects were investigated in the present study. Seven trained (63.7+/-4.7 years) and six untrained (63.5+/-4.5 years) healthy males performed three 30 min trials on a cycle ergometer at 50, 60 and 70% VO2max and two other trials at 60 and 70% VO2max in which the total energy expenditure was equal to that for 30 min at 50% VO2max Respiratory measures were undertaken throughout the exercise and blood samples taken before and immediately after each trial. Statistical analyses revealed a significant effect of exercise intensity on fat oxidation when the exercise durations were equated as well as when the energy expenditure was held constant for the three trials, though no training effect was noted. Total carbohydrate oxidation increased significantly with exercise intensity (P<0.05) and with training. Significantly higher levels of non-esterified free fatty acid (NEFA) and glycerol were observed for trained compared with untrained though not for B-hydroxybutyrate (3-OH) or insulin. No differences in NEFA, glycerol, 3-OH were evident for increases in exercise intensity. Carbohydrate and fat oxidation are significantly affected by exercise intensity in elderly males, although only CHO oxidation is influenced by training. Furthermore, training-induced increases in the availability of NEFA and glycerol are not associated with an increase in fat oxidation, rather an increase in CHO oxidation. |
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Authors:
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Minoo Bassami; Sajad Ahmadizad; Dominic Doran; Donald P M MacLaren |
Publication Detail:
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Type: Journal Article Date: 2007-08-28 |
Journal Detail:
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Title: European journal of applied physiology Volume: 101 ISSN: 1439-6319 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2007 Nov |
Date Detail:
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Created Date: 2007-09-27 Completed Date: 2008-02-20 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 525-32 Citation Subset: IM |
Affiliation:
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Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Henry Cotton Campus, 15-21 Webster Street, Liverpool, L3 2ET, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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3-Hydroxybutyric Acid
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blood Aged Anaerobic Threshold / physiology Blood Glucose / metabolism Body Composition / physiology Carbohydrate Metabolism / physiology Energy Metabolism / physiology Exercise / physiology* Fatty Acids, Nonesterified / blood Glycerol / blood Humans Kinetics Lipid Metabolism / physiology* Male Middle Aged Oxidation-Reduction Oxygen Consumption / physiology Physical Fitness / physiology* |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Fatty Acids, Nonesterified; 300-85-6/3-Hydroxybutyric Acid; 56-81-5/Glycerol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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