Role of Flavanols in Exercise and Aging
Acute and Long-term Effects of Dietary Flavanols on Local Control of Skeletal Muscle Blood Flow During Exercise in Young and Old Humans
Studieoversigt
Status
Status
Betingelser
Betingelser
Intervention / Behandling
Intervention / Behandling
Undersøgelsestype
Undersøgelsestype
Tilmelding (Faktiske)
Tilmelding
Fase
Fase
- Ikke anvendelig
Kontakter og lokationer
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
Berettigelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
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
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Grundvidenskab
- Tildeling: Randomiseret
- Interventionel model: Crossover opgave
- Maskning: Dobbelt
Antal våben
Våben og indgreb
Deltagergruppe / ArmDeltagergruppe / Arm |
Intervention / BehandlingIntervention / 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.
|
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.
|
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.
|
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.
|
Hvad måler undersøgelsen?
Primære resultatmål
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.
|
During knee extension exercise, change from baseline in blood flow 2 hours post flavanol ingestion
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Sekundære resultatmål
Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
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
Sponsor
Sponsor
Efterforskere
Efterforskere
- Ledende efterforsker: Michelle Harrison, M.A., University of Texas at Austin
Datoer for undersøgelser
Studer store datoer
Studiestart
Studiestart
Primær færdiggørelse (Faktiske)
Primær færdiggørelse
Studieafslutning (Faktiske)
Studieafslutning
Datoer for studieregistrering
Først indsendt
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først indsendt, der opfyldte QC-kriterier
Først opslået (Skøn)
Først opslået
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
Sidste opdatering sendt
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Nøgleord
Andre undersøgelses-id-numre
Andre undersøgelses-id-numre
- 2012-02-0114
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