Effect of low-caffeine green tea against sleep and stress in the middle-aged people

Effect of low-caffeine green tea against sleep and stress in the middle-aged people - Sleep and stress in the middle age

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000019411

Enrollment

Registered

2015-11-06

Start date

2015-11-06

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

Sleep, Stress

Interventions

Low-caffeine green tea, for 1 week Green tea, for 1 week

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Middle-aged people, who are working in Kakegawa City Hall Obtained written informed consent from the middle-aged people before the participation Possible to take green tea everyday Possible to check salivary amylase activity two times per day Possible to measure brain waves

Exclusion criteria

Exclusion criteria: Taking sleep-inducing drug and tranquilized; Smoker; Diagnosed as inadequate to participate in the study by a doctor

Design outcomes

Primary

Measure	Time frame
Alterations in brain waves and salivary amylase activity in the middle-aged people that drank green tea with lowered caffeine	—

Secondary

Measure	Time frame
Physical condition, Sleeping time, Replying to a questionnaire (subjective stress)	—

Countries

Japan

Contacts

Public ContactKeiko Unno

University of Shizuoka School of Pharmaceutical Sciences

kendaiunno@gmail.com054-264-5731

Outcome results

None listed

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