Effects of the difference of the display color temperature under using smartphone on human circadian rhythms

Effects of the difference of the display color temperature under using smartphone on human circadian rhythms - Effects of the difference of the display color temperature under using smartphone on human circadian rhythms

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000060028

Enrollment

Registered

2026-01-01

Start date

2026-01-01

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

Not selection

Interventions

High display color temperature in a.m. High display color temperature in p.m. Not higher than Intervention 1 in a.m., Not higher than intervention 2 in p.m.

Eligibility

Sex/Gender

Male

Inclusion criteria

Inclusion criteria: Healthy

Exclusion criteria

Exclusion criteria: (1) Patients with a result score of 3 or 4 on the Cornell Medical Index for neurosis emotional disorders (2) Extreme morning person or extreme night person in Morningness Eveningness Questionnaire (3) Pittsburgh Sleep Questionnaire with a score of 6 or higher (4) Those who have had a change in their living hours due to shift work or travel to time zones within one month (5) Those who are taking any oral medication or smoking (6) Those who has color vision variation (7) Students who are currently enrolled or may be enrolled in a course that the principal investigator is taking

Design outcomes

Primary

Measure	Time frame
The comparison of delta rectal temperature	—

Countries

Japan

Contacts

Public ContactTomoko Wakamura

Kyoto University School of Human Health Sciences, Graduate School of Medicine

wakamura.tomoko.5v@kyoto-u.ac.jp0757513974

Outcome results

None listed

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