The effect of daytime light environment on circadian rhythm of urination

The effect of daytime light environment on circadian rhythm of urination - The effect of daytime light environment on circadian rhythm of urination

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000038350

Enrollment

Registered

2019-11-10

Start date

2019-11-10

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 men

Interventions

The light environment during the day (10: 00-18: 00) at 50 lx. The light environment during the day (10: 00-18: 00) at 1000 lx.

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: People with mental or physical disorders as determined by the Cornell Medical Index. Extremely Morningness-type or Extremely Eveningness-type determined by Morningness-Eveningness questionnaire. People with sleep disorders as determined by Pittsburgh sleep quality index. People with dysuria as determined by International Prostate Symptom Score.

Design outcomes

Primary

Measure	Time frame
Urination volume	—

Secondary

Measure	Time frame
Urine biochemistry	—

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