| A comparative analysis between the effects of galactose and glucose supplementation on endurance performance. | |
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MedLine Citation:
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PMID: 22248497 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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PURPOSE: To determine beneficial effects of short-term galactose (GAL) supplementation over a 50:50 glucose-maltodextrin (GLUC) equivalent on self-paced endurance cycling performance. METHODS: On 2 separate occasions, subjects performed a 100-km self-paced time trial (randomized and balanced order). This was interspersed with four 1-km and four 4-km maximal efforts reflecting the physical requirements of racing. Before each trial 38 ± 3 g of GAL or GLUC was ingested in a 6% concentrate fluid form 1 hr preexercise and then during exercise at a rate of 37 ± 3 g/hr. Performance variables were recorded for all 1- and 4-km efforts, all interspersed intervals, and the total 100-km distance. Noninvasive indicators of work intensity (heart rate [HR] and rating of perceived exertion) were also recorded. RESULTS: Times taken to complete the 100-km performance trial were 8,298 ± 502 and 8,509 ± 578 s (p = .132), with mean power outputs of 271 ± 37 and 256 ± 45 W (p = .200), for GAL and GLUC, respectively. Mean HR did not differ (GAL 157 ± 7 and GLUC 157 ± 7 beats/min, p = .886). A main effect of carbohydrate (CHO) type on time to complete 4-km efforts occurred, with no CHO Type × Effort Order interaction observed. No main effect of CHO type or interaction of CHO Type × Sequential Order occurred for 1-km efforts. CONCLUSION: A 6% GAL drink does not enhance performance time during a self-paced cycling performance trial in highly trained endurance cyclists compared with a formula typically used by endurance athletes but may improve the ability to produce intermediate self-paced efforts. |
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Authors:
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Paul W Macdermid; Stephen Stannard; Dean Rankin; David Shillington |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: International journal of sport nutrition and exercise metabolism Volume: 22 ISSN: 1543-2742 ISO Abbreviation: Int J Sport Nutr Exerc Metab Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-01-17 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100939812 Medline TA: Int J Sport Nutr Exerc Metab Country: United States |
Other Details:
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Languages: eng Pagination: 24-30 Citation Subset: IM |
Affiliation:
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School of Sport and Exercise, Massey University Manawatu (Turitea), Manawatu, New Zealand. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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