| Metabolism and performance during extended high-intensity intermittent exercise after consumption of low- and high-glycaemic index pre-exercise meals. | |
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MedLine Citation:
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PMID: 22916819 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The metabolic and performance benefits of prior consumption of low-glycaemic index (GI) meals v. high-GI meals were determined in extended high-intensity intermittent exercise. Participants (ten males and four females, aged 25·8 (sd 7·3) years) completed two testing days (each consisting of back-to-back 90-min intermittent high-intensity treadmill running protocols separated by 3 h) spaced by at least 7 d. Using a randomised counterbalanced cross-over design, low-GI, lentil-based meals (GI about 42) or high-GI, potato-based meals (GI about 78) matched for energy value were consumed 2 h before, and within 1 h after, the first exercise session. Performance was measured by the distance covered during five 1-min sprints (separated by 2·5 min walking) at the end of each exercise session. Peak postprandial blood glucose was higher by 30·8 % in the high-GI trial compared with the low-GI trial, as was insulin (P = 0·039 and P = 0·003, respectively). Carbohydrate oxidation was lower by 5·5 % during the low-GI trials compared with the high-GI trials at the start of the first exercise session (P < 0·05). Blood lactate was significantly higher (6·1 v. 2·6 mmol/l; P = 0·019) and blood glucose significantly lower (4·8 v. 5·4 mmol/l; P = 0·039) at the end of the second exercise session during the high-GI trial compared with the low-GI trial. Sprint distance was not significantly different between conditions. A low-GI meal improved the metabolic profile before and during extended high-intensity intermittent exercise, but did not affect performance. Improvements in metabolic responses when consuming low-GI meals before exercise may be beneficial to the long-term health of athletes. |
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Authors:
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Christine B Bennett; Philip D Chilibeck; Trevor Barss; Hassanali Vatanparast; Albert Vandenberg; Gordon A Zello |
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Publication Detail:
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Type: JOURNAL ARTICLE |
Journal Detail:
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Title: The British journal of nutrition Volume: 108 ISSN: 1475-2662 ISO Abbreviation: Br. J. Nutr. Publication Date: 2012 Aug |
Date Detail:
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Created Date: 2012-8-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372547 Medline TA: Br J Nutr Country: - |
Other Details:
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Languages: ENG Pagination: S81-S90 Citation Subset: - |
Affiliation:
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College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, SK, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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