Role of Flavanols in Exercise and Aging
24 juni 2014 bijgewerkt door: Robert M. Brothers, University of Texas at Austin
Acute and Long-term Effects of Dietary Flavanols on Local Control of Skeletal Muscle Blood Flow During Exercise in Young and Old Humans
It has well known that diets rich in fruits, vegetables and cocoa products are associated with positive health benefits and these positive effects have been shown to be due to compounds they contain called flavanols.
Flavanols have been shown to exert their positive effects by indirectly increasing nitric oxide (NO) bioavailability.
NO is a potent vasodilator that is believed to play a role in increasing blood flow to active muscle during exercise.
This regulatory process is impaired with healthy aging.
The underlying premise to this study is that if NO bioavailability can be increased following flavanol ingestion, will there be a restoration of blood flow during exercise in older individuals?
Accordingly, the first part of this research project will compare the acute vascular effects of flavanol ingestion between a young and old group.
The investigators have hypothesized that both groups will show an improvement in blood flow to active muscle during exercise, though the magnitude of the change will be greater in the older group.
The second part of this project will look at the effects of 4 weeks of daily flavanol ingestion in the old group.
The investigators hypothesize that subjects will demonstrate an improvement in blood flow to active muscle during exercise after the 4 week intervention and that the magnitude of the change will be greater than the acute effects.
Findings from this proposal will provide evidence for the efficacy of flavanols to be used (as a simple and safe lifestyle intervention) to reverse or combat impaired blood flow regulation in older individuals.
Studie Overzicht
Toestand
Voltooid
Conditie
Studietype
Ingrijpend
Inschrijving (Werkelijk)
20
Fase
- Niet toepasbaar
Contacten en locaties
In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.
Studie Locaties
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Texas
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Austin, Texas, Verenigde Staten, 78712
- University of Texas at Austin: Environmental and Autonomic Physiology Laboratory
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Deelname Criteria
Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
18 jaar tot 80 jaar (Volwassen, Oudere volwassene)
Accepteert gezonde vrijwilligers
Ja
Geslachten die in aanmerking komen voor studie
Allemaal
Beschrijving
Inclusion Criteria:
- Males and Females between 18 - 30 years old
- Males and Females between 60 - 80 years old
Exclusion Criteria:
- cardiovascular and/or microvascular disease
- blood clotting disorder
- pregnant lady
- current smoker (or regularly smoked within last year)
- a history of an adverse reaction to cold
- taking medications known to effect the autonomic nervous system
Studie plan
Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Fundamentele wetenschap
- Toewijzing: Gerandomiseerd
- Interventioneel model: Crossover-opdracht
- Masker: Dubbele
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
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Experimenteel: Acute effects of flavanol consumption
The outcome measurements will be made on all study participants before and 2 hours after consumption of the high flavanol beverage.
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The experimental trial (high flavanol content) will involve the consumption of a beverage containing about 1000mg of cocoa flavanols.
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Placebo-vergelijker: Low Flavanol Trial; acute effects
Once again, the outcome measurements will be made on all study participants before and 2 hours after consumption of the low flavanol beverage.
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The placebo trial (low flavanol content) will involve the consumption of a beverage containing 75 mg of cocoa flavanols.
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Experimenteel: Long-term effects of flavanol consumption
Only those study participants over 60 years of age will continue with this arm of the trial.
The same outcome measures will be performed following 4 weeks of daily consumption of a high flavanol beverage.
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The experimental trial (high flavanol content) will involve the daily consumption of a beverage containing about 1000mg of cocoa flavanols for 4 weeks.
Subjects will be provided with 28 packets of the beverage to take home with them.
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Placebo-vergelijker: Low Flavanol Trial; long-term effects
Only those study participants over 60 years of age will continue with this arm of the trial.
The same outcome measures will be performed following 4 weeks of daily consumption of a low flavanol beverage.
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The placebo trial (low flavanol content) will involve the daily consumption of a beverage containing 75 mg of cocoa flavanols for 4 weeks.
Subjects will be provided with 28 packets to take home with them.
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
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Change in femoral blood flow during exercise following flavanol consumption
Tijdsspanne: During knee extension exercise, change from baseline in blood flow 2 hours post flavanol ingestion
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Blood flow regulation to active muscles during knee extension exercise can be assessed by using ultrasound to measure blood flow in the femoral artery.
This will be done before and after stimulation of the sympathetic nervous system.
A baseline value will be obtained and then the measurement will be performed again 2 hours after flavanol ingestion.
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During knee extension exercise, change from baseline in blood flow 2 hours post flavanol ingestion
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Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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Change in flow-mediated dilation (FMD) following flavanol consumption
Tijdsspanne: Change from baseline in FMD 2 hours post flavanol ingestion
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Flow-mediated dilation is commonly used as an index of nitric oxide bioavailability.
Nitric oxide is believed to play a role in blood flow regulation during exercise.
A baseline value will be obtained and then the measurement will be performed again 2 hours after flavanol ingestion.
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Change from baseline in FMD 2 hours post flavanol ingestion
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Medewerkers en onderzoekers
Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.
Sponsor
Onderzoekers
- Hoofdonderzoeker: Michelle Harrison, M.A., University of Texas at Austin
Studie record data
Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.
Bestudeer belangrijke data
Studie start
1 december 2012
Primaire voltooiing (Werkelijk)
1 april 2014
Studie voltooiing (Werkelijk)
1 april 2014
Studieregistratiedata
Eerst ingediend
8 maart 2012
Eerst ingediend dat voldeed aan de QC-criteria
15 maart 2012
Eerst geplaatst (Schatting)
19 maart 2012
Updates van studierecords
Laatste update geplaatst (Schatting)
25 juni 2014
Laatste update ingediend die voldeed aan QC-criteria
24 juni 2014
Laatst geverifieerd
1 mei 2014
Meer informatie
Termen gerelateerd aan deze studie
Trefwoorden
Andere studie-ID-nummers
- 2012-02-0114
Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .