- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT01557738
Role of Flavanols in Exercise and Aging
24. juni 2014 opdateret af: 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.
Studieoversigt
Status
Afsluttet
Betingelser
Undersøgelsestype
Interventionel
Tilmelding (Faktiske)
20
Fase
- Ikke anvendelig
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiesteder
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Texas
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Austin, Texas, Forenede Stater, 78712
- University of Texas at Austin: Environmental and Autonomic Physiology Laboratory
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Deltagelseskriterier
Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.
Berettigelseskriterier
Aldre berettiget til at studere
18 år til 80 år (Voksen, Ældre voksen)
Tager imod sunde frivillige
Ja
Køn, der er berettiget til at studere
Alle
Beskrivelse
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
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Grundvidenskab
- Tildeling: Randomiseret
- Interventionel model: Crossover opgave
- Maskning: Dobbelt
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
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Eksperimentel: 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 komparator: 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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Eksperimentel: 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 komparator: 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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Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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Change in femoral blood flow during exercise following flavanol consumption
Tidsramme: 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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Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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Change in flow-mediated dilation (FMD) following flavanol consumption
Tidsramme: 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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Samarbejdspartnere og efterforskere
Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.
Sponsor
Efterforskere
- Ledende efterforsker: Michelle Harrison, M.A., University of Texas at Austin
Datoer for undersøgelser
Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.
Studer store datoer
Studiestart
1. december 2012
Primær færdiggørelse (Faktiske)
1. april 2014
Studieafslutning (Faktiske)
1. april 2014
Datoer for studieregistrering
Først indsendt
8. marts 2012
Først indsendt, der opfyldte QC-kriterier
15. marts 2012
Først opslået (Skøn)
19. marts 2012
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
25. juni 2014
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
24. juni 2014
Sidst verificeret
1. maj 2014
Mere information
Begreber relateret til denne undersøgelse
Nøgleord
Andre undersøgelses-id-numre
- 2012-02-0114
Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .
Kliniske forsøg med High Flavanol Trial
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University of California, DavisMars, Inc.AfsluttetSund og raskForenede Stater
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Heinrich-Heine University, DuesseldorfAfsluttetHjerte-kar-sygdommeTyskland
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Klinik für Kardiologie, Pneumologie und AngiologieAfsluttet
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University of NottinghamMars, Inc.AfsluttetDiabetesDet Forenede Kongerige
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University of ReadingAfsluttet
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NYU Langone HealthTrukket tilbage
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Seoul National University HospitalAfsluttet
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New York State Psychiatric InstituteMars, Inc.Afsluttet
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Wageningen UniversityTop Institute Food and NutritionAfsluttet
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Heinrich-Heine University, DuesseldorfAfsluttet