Effect of the difference in daytime light-source colors on nighttime hormone secretion

Effect of the difference in daytime light-source colors on nighttime hormone secretion - Effect of the difference in daytime light-source colors on nighttime hormone secretion

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000031944

Enrollment

Registered

2018-03-28

Start date

2018-04-01

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 adults

Interventions

[First intervention] Daytime blue-enriched light exposure [Second intervention] Daytime red-enriched light exposure These interventions will be performed more than a week apart from each other [

Eligibility

Sex/Gender

Male

Inclusion criteria

Inclusion criteria: Healthy adult male

Exclusion criteria

Exclusion criteria: 1) Mental diseases 2) Extreame morningness-type 3) Extreame eveningness-type 4) Sleep disorder 5) Smorker

Design outcomes

Primary

Measure	Time frame
Change in nighttime melatonin secretion between baseline and after intervebtion	—

Countries

Japan

Contacts

Public ContactTomoko Wakamura

Graduate School of Medicine, Kyoto University Human Health Sciences

wakamura.tomoko.5v@kyoto-u.ac.jp075-751-3974

Outcome results

None listed

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