| Oxidation of solid versus liquid CHO sources during exercise. | |
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MedLine Citation:
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PMID: 20404762 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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PURPOSE: To investigate exogenous CHO oxidation from CHO provided in either solid (BAR) or solution (DRINK) form during cycling. METHODS: Eight well-trained subjects (age = 31 ± 7 yr, mass = 73 ± 5 kg, height = 1.79 ± 0.05 m, VO2max = 69 ± 6 mL·kg−¹·min−¹) cycled at 58% ± 4% VO2max for 180 min while receiving one of the following three treatments in randomized order: BAR plus water, DRINK, or water. The BAR and DRINK was delivered glucose + fructose (GLU + FRC) in a ratio of 2:1 at a rate of 1.55 g·min−¹, and fluid intake was matched between treatments. RESULTS: During the final 2 h of exercise, overall mean exogenous CHO oxidation rate was −0.11 g·min−¹ lower in BAR (95% confidence interval = −0.27 to 0.05 g·min−¹, P = 0.19) relative to DRINK, whereas exogenous CHO oxidation rates were 15% lower in BAR (P < 0.05) at 120, 135, and 150 min of exercise. Peak exogenous CHO oxidation rates were high in both conditions (BAR 1.25 ± 0.15 g·min−¹ and DRINK 1.34 ± 0.27 g·min−¹) but were not significantly different (P = 0.36) between treatments (mean difference = −0.9 g·min−¹, 95% confidence interval = −0.32 to 0.13 g·min−¹). CONCLUSIONS: The present study demonstrates that a GLU + FRC mix administered as a solid BAR during cycling can lead to high mean and peak exogenous CHO oxidation rates (91 g·min−¹). The GLU + FRC mix ingested in the form of a solid BAR resulted in similar mean and peak exogenous CHO oxidation rates and showed similar oxidation efficiencies as a DRINK. These findings suggest that CHO from a solid BAR is effectively oxidized during exercise and can be a practical form of supplementation alongside other forms of CHO. |
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Authors:
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Beate Pfeiffer; Trent Stellingwerff; Eric Zaltas; Asker E Jeukendrup |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 42 ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-10-26 Completed Date: - Revised Date: - |
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: 2030-7 Citation Subset: IM; S |
Affiliation:
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School of Sport and Exercise Sciences, University of Birmingham, Edgbaston, Birmingham, England, United Kingdom. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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