Earnest, Conrad P.

Lloyd, Harriet

Journal of the International Society of Sports Nutrition

PubMed

OPUS

        Citation for published version:Lloyd, H & Earnest, CP 2014, 'Effect of acute green tea extract ingestion on fat oxidation during exercise inwomen', Journal of the International Society of Sports Nutrition, vol. 11, P15. https://doi.org/10.1186/1550-2783-11-S1-P15DOI:10.1186/1550-2783-11-S1-P15Publication date:2014Document VersionPublisher's PDF, also known as Version of recordLink to publicationPublisher RightsCC BYUniversity of BathGeneral rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediatelyand investigate your claim.Download date: 13. May. 2019POSTER PRESENTATION Open AccessEffect of acute green tea extract ingestion on fatoxidation during exercise in womenHarriet Lloyd, Conrad P Earnest*From The Eleventh International Society of Sports Nutrition (ISSN) Conference and ExpoClearwater Beach, FL, USA. 20-21 June 2014BackgroundGreen tea and green tea extract (GTE) consumption isassociated with health, exercise performance, fat oxida-tion and weight loss owing to studies reporting positiveeffects accompanying chronic supplementation (>30 d).While the overall literature surrounding GTE is equivo-cal, little data exists examining the effects of acute sup-plementation prior to exercise (< 24 hr). The primaryaim of our current study was to investigate the effects ofacute decaffeinated GTE ingestion on fat oxidation ratesduring moderate-intensity exercise in physically activefemales.MethodsWe randomized 10 physically active females (mean ± SD:age: 20 ± 1.2 y; weight: 65.7 ± 6.1 kg; body mass index:23.8 ± 2.2 kg/m2; VO2max: 51.4 ± 6.2 ml kg-1 min-1) toparticipate in our study. Prior to treatment, the partici-pants volunteered to perform a VO2max test in order toestablish their exercise testing intensity. Subsequently, werandomly assigned to the double-blind, counter-balanced,cross-over treatments of encapsulated, decaffeinated, GTEor a colour matched corn flour placebo (PLA) in twodoses; 2 capsules with dinner the night before, 2 capsuleswith breakfast the morning of testing. Treatment capsulescontained 340 mg polyphenols and 85 mg EGCG. Testingconsisted of having participants initiate riding on bicycleergometer for 45 min at a workload associated with 65%VO2max. Respiratory gas measurements were collected atrest and in 3 min epochs, 5 min after starting exercise andevery 15 min during exercise, in order to calculate fat andcarbohydrate oxidation and total energy expenditure. Sec-ondary measures included heart rate (HR) and ratings ofperceived of exertion (RPE) during exercise testing. Over-all carbohydrate and fat oxidation were analysed using anintegrated area-under-the-curve (AUC) from rest throughthe completion of exercise. A paired-sample t-test com-pared AUC for fat oxidation and the total, and relativesubstrate contribution to, energy expenditure at rest andduring exercise. Potential differences in fat oxidation, car-bohydrate oxidation, RER, HR and RPE between treatmentgroups were examined at each time point including 0(rest), 5, 15, 30 and 45 minutes into steady-state cyclingusing a 2-factor (treatment x time) repeated measures ana-lysis of variance (ANOVA). Data are presented as mean ±SD or 95% confidence intervals (CI) when appropriate.Significance was set at P < 0.05. Consent to publish theresults was obtained from all participants.ResultsOverall, the acute ingestion of each respective supple-ment had no significant effect for GTE (20.8 g/min, 95% CI, 12.2, 24.0) or PLA and 18.19 g/min, 95% CI, 12.2,24.0). Moreover, the relative contribution of fat to totalenergy expenditure at rest (42% PLA; 36% GTE) andduring exercise (28% PLA; 23% GTE) was not signifi-cantly different between trials. No further effects werenoted for total energy expenditure, and carbohydrateand fat oxidation, RER, HR and RPE at each respectivetime point.ConclusionsIn contrast to previous reports, the acute ingestion ofdecaffeinated GTE did not significantly alter whole-bodyfat oxidation rates during exercise in physically activefemales. However, the response to GTE was highly vari-able between individuals; thus, more research is requiredto investigate potential moderators of the effects ofGTE.* Correspondence: cpe03@icloud.comUniversity of Bath Sports, Bath, United KingdomLloyd and Earnest Journal of the International Society of Sports Nutrition 2014, 11(Suppl 1):P15http://www.jissn.com/content/11/S1/P15© 2014 Lloyd and Earnest; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the CreativeCommons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, andreproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.Published: 1 December 2014doi:10.1186/1550-2783-11-S1-P15Cite this article as: Lloyd and Earnest: Effect of acute green tea extractingestion on fat oxidation during exercise in women. Journal of theInternational Society of Sports Nutrition 2014 11(Suppl 1):P15.Submit your next manuscript to BioMed Centraland take full advantage of: • Convenient online submission• Thorough peer review• No space constraints or color figure charges• Immediate publication on acceptance• Inclusion in PubMed, CAS, Scopus and Google Scholar• Research which is freely available for redistributionSubmit your manuscript at www.biomedcentral.com/submitLloyd and Earnest Journal of the International Society of Sports Nutrition 2014, 11(Suppl 1):P15http://www.jissn.com/content/11/S1/P15Page 2 of 2

Effect of acute green tea extract ingestion on fat oxidation during exercise in women

        Citation for published version:Lloyd, H & Earnest, CP 2014, 'Effect of acute green tea extract ingestion on fat oxidation during exercise inwomen', Journal of the International Society of Sports Nutrition, vol. 11, P15. https://doi.org/10.1186/1550-2783-11-S1-P15DOI:10.1186/1550-2783-11-S1-P15Publication date:2014Document VersionPublisher's PDF, also known as Version of recordLink to publicationPublisher RightsCC BYUniversity of BathGeneral rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediatelyand investigate your claim.Download date: 23. Jan. 2020POSTER PRESENTATION Open AccessEffect of acute green tea extract ingestion on fatoxidation during exercise in womenHarriet Lloyd, Conrad P Earnest*From The Eleventh International Society of Sports Nutrition (ISSN) Conference and ExpoClearwater Beach, FL, USA. 20-21 June 2014BackgroundGreen tea and green tea extract (GTE) consumption isassociated with health, exercise performance, fat oxida-tion and weight loss owing to studies reporting positiveeffects accompanying chronic supplementation (>30 d).While the overall literature surrounding GTE is equivo-cal, little data exists examining the effects of acute sup-plementation prior to exercise (< 24 hr). The primaryaim of our current study was to investigate the effects ofacute decaffeinated GTE ingestion on fat oxidation ratesduring moderate-intensity exercise in physically activefemales.MethodsWe randomized 10 physically active females (mean ± SD:age: 20 ± 1.2 y; weight: 65.7 ± 6.1 kg; body mass index:23.8 ± 2.2 kg/m2; VO2max: 51.4 ± 6.2 ml kg-1 min-1) toparticipate in our study. Prior to treatment, the partici-pants volunteered to perform a VO2max test in order toestablish their exercise testing intensity. Subsequently, werandomly assigned to the double-blind, counter-balanced,cross-over treatments of encapsulated, decaffeinated, GTEor a colour matched corn flour placebo (PLA) in twodoses; 2 capsules with dinner the night before, 2 capsuleswith breakfast the morning of testing. Treatment capsulescontained 340 mg polyphenols and 85 mg EGCG. Testingconsisted of having participants initiate riding on bicycleergometer for 45 min at a workload associated with 65%VO2max. Respiratory gas measurements were collected atrest and in 3 min epochs, 5 min after starting exercise andevery 15 min during exercise, in order to calculate fat andcarbohydrate oxidation and total energy expenditure. Sec-ondary measures included heart rate (HR) and ratings ofperceived of exertion (RPE) during exercise testing. Over-all carbohydrate and fat oxidation were analysed using anintegrated area-under-the-curve (AUC) from rest throughthe completion of exercise. A paired-sample t-test com-pared AUC for fat oxidation and the total, and relativesubstrate contribution to, energy expenditure at rest andduring exercise. Potential differences in fat oxidation, car-bohydrate oxidation, RER, HR and RPE between treatmentgroups were examined at each time point including 0(rest), 5, 15, 30 and 45 minutes into steady-state cyclingusing a 2-factor (treatment x time) repeated measures ana-lysis of variance (ANOVA). Data are presented as mean ±SD or 95% confidence intervals (CI) when appropriate.Significance was set at P < 0.05. Consent to publish theresults was obtained from all participants.ResultsOverall, the acute ingestion of each respective supple-ment had no significant effect for GTE (20.8 g/min, 95% CI, 12.2, 24.0) or PLA and 18.19 g/min, 95% CI, 12.2,24.0). Moreover, the relative contribution of fat to totalenergy expenditure at rest (42% PLA; 36% GTE) andduring exercise (28% PLA; 23% GTE) was not signifi-cantly different between trials. No further effects werenoted for total energy expenditure, and carbohydrateand fat oxidation, RER, HR and RPE at each respectivetime point.ConclusionsIn contrast to previous reports, the acute ingestion ofdecaffeinated GTE did not significantly alter whole-bodyfat oxidation rates during exercise in physically activefemales. However, the response to GTE was highly vari-able between individuals; thus, more research is requiredto investigate potential moderators of the effects ofGTE.* Correspondence: cpe03@icloud.comUniversity of Bath Sports, Bath, United KingdomLloyd and Earnest Journal of the International Society of Sports Nutrition 2014, 11(Suppl 1):P15http://www.jissn.com/content/11/S1/P15© 2014 Lloyd and Earnest; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the CreativeCommons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, andreproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.Published: 1 December 2014doi:10.1186/1550-2783-11-S1-P15Cite this article as: Lloyd and Earnest: Effect of acute green tea extractingestion on fat oxidation during exercise in women. Journal of theInternational Society of Sports Nutrition 2014 11(Suppl 1):P15.Submit your next manuscript to BioMed Centraland take full advantage of: • Convenient online submission• Thorough peer review• No space constraints or color figure charges• Immediate publication on acceptance• Inclusion in PubMed, CAS, Scopus and Google Scholar• Research which is freely available for redistributionSubmit your manuscript at www.biomedcentral.com/submitLloyd and Earnest Journal of the International Society of Sports Nutrition 2014, 11(Suppl 1):P15http://www.jissn.com/content/11/S1/P15Page 2 of 2

Effect of acute green tea extract ingestion on fat oxidation during exercise in women

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