Effect of LED light using violet excitation peak on melatonin suppression

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-jRCT1030200061

Enrollment

Registered

2020-07-01

Start date

2020-06-22

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

Polychromatic LED light using violet excitation peak (3 hour exposure) and Polychromatic LED light using blue excitation peak (3 hour exposure).

Eligibility

Sex/Gender

Male

Inclusion criteria

Inclusion criteria: male, 20=< age <=39

Exclusion criteria

Exclusion criteria: PSQI (Pittsburgh Sleep Quality Index) > 5, MEQ (Morningness Eveningness Questionnaire) = 70, mental disease patient, eye disease patient, participants who need dental treatment

Design outcomes

Primary

Measure	Time frame
Concentration of saliva melatonin	—

Secondary

Measure	Time frame
Psychomotor vigilance task, Karolinska Sleepiness Scale	—

Contacts

Public ContactKatsuhiro Mitsui

KYOCERA Corporation

katsuhiro.mitsui.yb@kyocera.jp+81-80-6234-7334

Outcome results

None listed

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