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Research on the effect of light stimulation control throughout the day on photoreceptors related to circadian rhythm based on metamerism for change in illuminant design method on human health

Research on the effect of light stimulation control throughout the day on photoreceptors related to circadian rhythm based on metamerism for change in illuminant design method on human health - Research on the effect of light stimulation control throughout the day on photoreceptors related to circadian rhythm based on metamerism for change in illuminant design method on human health

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
JPRN
Registry ID
JPRN-UMIN000042141
Enrollment
20
Registered
2020-11-01
Start date
2020-11-01
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 mem

Interventions

Color temperature is 6500k from 0700 3100K from 1630, mRGC is 20 from 0700 14 from 1630 Color temperature is 1200K from 0700 to 0715, 3100K from 1630, mRGC keeps stimulation after 40 from 0700 to 0715

Sponsors

Kyoto University
Lead Sponsor

Eligibility

Sex/Gender
Male

Inclusion criteria

Inclusion criteria: Non-smoking person. People who have not taken any medicines including sleeping pills. People who usually go to sleep from 23:00 to 1:00 h and wake up from 6:00 to 8:00 h.

Exclusion criteria

Exclusion criteria: eople with mental or physical disorders as determined by the Cornell Medical Index. Extremely Morningness-type determined by Morningness-Eveningness questionnaire. People with sleep disorders as determined by Pittsburgh sleep quality index.

Design outcomes

Primary

MeasureTime frame
Dim Light Melatonin Onset (DLMO) after light exposure—

Countries

Japan

Contacts

Public ContactTomoko Wakamura

Kyoto University Human Health Sciences, Graduate School of Medicine

wakamura.tomoko.5v@kyoto-u.ac.jp81-75-751-3974

Outcome results

None listed

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