Effect of black tea consumption on flow mediated dilatation: A randomized, placebo controlled, double blind, crossover trial.

Effect of black tea consumption on flow mediated dilatation: A randomized, placebo controlled, double blind, crossover trial. - Effect of black tea consumption on flow mediated dilatation

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000011889

Enrollment

Registered

2013-09-30

Start date

2013-10-01

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Healthy volunteers

Interventions

FMD analysis and blood sampling is carried out before intake of black tea, 2 and 4 hours after intake of drink FMD analysis and blood sampling is carried out before intake of placebo drink, 2 and 4

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1) Subjects aged 20 through 65 years 2) Subjects whose systolic blood pressure below 150 mmHg 3) Subjects who have not taken alcohol drink the day before 4) Subjects are competent to consent

Exclusion criteria

Exclusion criteria: 1) Subjects who is currently taking medication for hypertension 2) Subjects who take any supplement, functional food, tea or chocolate during the test period. 3) Subjects who drink more than 25 g/day of alcohol 4) Subjects who has sports habit. 5) Subjects with diabetes, renal disease, or hepatic disease 6) Subjects with a diagnosis of familial hypertension 7) Subjects with any history for alimentary allergy 8) Subjects who is pregnant, plan to get pregnant between trial period, is during lactation. 9) Subjects who, in the opinion of the investigator, are not likely to participate in the study for any reason

Design outcomes

Primary

Measure	Time frame
FMD	—

Secondary

Measure	Time frame
Blood Nitrate/Nitrite concentration Blood catechole amine concentration	—

Countries

Japan

Contacts

Public ContactNaomi Osakabe

Shibaura Institute of Technology Faculaty of System Engineeringand Science

nao-osa@sic.sibaura-it.ac.jp048-720-6031

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026