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dc.contributor.authorJamurtas, AZ
dc.contributor.authorTofas, T
dc.contributor.authorFatouros, I
dc.contributor.authorNikolaidis, MG
dc.contributor.authorPaschalis, V
dc.contributor.authorYfanti, C
dc.contributor.authorRaptis, S
dc.contributor.authorKoutedakis, Y
dc.date.accessioned2021-01-25T12:12:21Z
dc.date.available2021-01-25T12:12:21Z
dc.date.issued2011-10-20
dc.identifier.citationJamurtas, A.Z., Tofas, T., Fatouros, I. et al. (2011) The effects of low and high glycemic index foods on exercise performance and beta-endorphin responses, Journal of the International Society of Sports Nutrition, 8(15). https://doi.org/10.1186/1550-2783-8-15en
dc.identifier.issn1550-2783en
dc.identifier.pmid22013987 (pubmed)
dc.identifier.doi10.1186/1550-2783-8-15en
dc.identifier.urihttp://hdl.handle.net/2436/623892
dc.description© 2011 The Authors. Published by BMC. This is an open access article available under a Creative Commons licence. The published version can be accessed at the following link on the publisher’s website: https://doi.org/10.1186/1550-2783-8-15en
dc.description.abstractΤhe aim of this study was to examine the effects of the consumption of foods of various glycemic index values on performance, β-endorphin levels and substrate (fat and carbohydrate) utilization during prolonged exercise. Eight untrained healthy males underwent, in a randomized counterbalanced design, three experimental conditions under which they received carbohydrates (1.5 gr. kg-1 of body weight) of low glycemic index (LGI), high glycemic index (HGI) or placebo. Food was administered 30 min prior to exercise. Subjects cycled for 60 min at an intensity corresponding to 65% of VO2max, which was increased to 90% of VO2max, then they cycled until exhaustion and the time to exhaustion was recorded. Blood was collected prior to food consumption, 15 min prior to exercise, 0, 20, 40, and 60 min into exercise as well as at exhaustion. Blood was analyzed for β-endorphin, glucose, insulin, and lactate. The mean time to exhaustion did not differ between the three conditions (LGI = 3.2 ± 0.9 min; HGI = 2.9 ± 0.9 min; placebo = 2.7 ± 0.7 min). There was a significant interaction in glucose and insulin response (P < 0.05) with HGI exhibiting higher values before exercise. β-endorphin increased significantly (P < 0.05) at the end of exercise without, however, a significant interaction between the three conditions. Rate of perceived exertion, heart rate, ventilation, lactate, respiratory quotient and substrate oxidation rate did not differ between the three conditions. The present study indicates that ingestion of foods of different glycemic index 30 min prior to one hour cycling exercise does not result in significant changes in exercise performance, β-endorphin levels as well as carbohydrate and fat oxidation during exercise. © 2011 Jamurtas et al; licensee BioMed Central Ltd.en
dc.formatapplication/pdfen
dc.languageeng
dc.language.isoenen
dc.publisherSpringer Science and Business Media LLCen
dc.relation.urlhttps://jissn.biomedcentral.com/articles/10.1186/1550-2783-8-15en
dc.rightsLicence for published version: Creative Commons Attribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectGlucoseen
dc.subjectInsulinen
dc.subjectopioidsen
dc.subjectTrainingen
dc.subjectfooden
dc.titleThe effects of low and high glycemic index foods on exercise performance and beta-endorphin responsesen
dc.typeJournal articleen
dc.identifier.eissn1550-2783
dc.identifier.journalJournal of the International Society of Sports Nutritionen
dc.date.updated2021-01-24T19:50:50Z
dc.contributor.institutionUniversity of Thessaly, Department of Physical Education and Sport Science, Karies, 42100, Trikala, Greece. ajamurt@pe.uth.gr.
pubs.place-of-publicationUnited States
dc.date.accepted2011-10-20
rioxxterms.funderUniversity of Wolverhamptonen
rioxxterms.identifier.projectUOW25012021YKen
rioxxterms.versionVoRen
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/en
rioxxterms.licenseref.startdate2021-01-25en
dc.source.volume8
dc.source.issue1
dc.source.beginpage15
dc.description.versionPublished version
refterms.dateFCD2021-01-25T12:12:10Z
refterms.versionFCDVoR
refterms.dateFOA2021-01-25T12:12:22Z


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Licence for published version: Creative Commons Attribution 4.0 International
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