Clinical study on the effects of green tea components on sleep and stress

Clinical study on the effects of green tea components on sleep and stress - Clinical study on the effects of green tea components on sleep and stress

Status

Recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000046109

Enrollment

Registered

2021-11-18

Start date

2021-11-15

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 person

Interventions

General green tea. Green tea including low caffeine.

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: (1)Being at least 20 years old when obtaining informed consent (2)Able to take green tea (3)Able to collect saliva (4)Able to collect information by a wearable activity tracker (wristwatch style) (5)Obtained written informed consent from subjects

Exclusion criteria

Exclusion criteria: (1)Subjects taking drugs that affect sleep such as stimulants (diethylpropion, epinephrine), sleep inducing drug and antianxiety drugs (etizolam, diazepam) (2)Subjects who take beverages containing caffein or theanine such as green tea, coffee, coke and energy drink from Monday to Friday during the study (3)Subjects diagnosed by physicians inappropriate to participate in the study

Design outcomes

Primary

Measure	Time frame
Brain waves in sleep	—

Countries

Japan

Contacts

Public ContactDaisuke Furushima

University of Shizuoka School of Pharmaceutical Sciences

dfuru@u-shizuoka-ken.ac.jp0542645102

Outcome results

None listed

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