Effect of bright light exposure on the circadian rhythm of the elderly

Effect of bright light exposure on the circadian rhythm of the elderly - Effect of bright light exposure on the circadian rhythm of the elderly

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000046523

Enrollment

Registered

2022-01-10

Start date

2021-01-31

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

Elderly people

Interventions

2 weeks light exposure

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1. Individuals can collect the required amount of saliva (about 1.9 g) in 5 minutes 2. Individuals can understand the research contents

Exclusion criteria

Exclusion criteria: 1. Individuals with SARS-CoV-2 2. Patients with insomnia or sleep apnea syndrome or restless legs syndrome 3. Patients with psychological diseases or dementia 4. Patients with severe eye diseases 5. Smokers 6. Individuals with alcohol drinking habit 7. Individuals with Long-term Care Need at levels 4 or more 8. Shift workers or night workers 9. Others who the researcher judged inappropriate

Design outcomes

Primary

Measure	Time frame
Urinary melatonin	—

Secondary

Measure	Time frame
1. Salivary melatonin 2. Salivary cortisol 3. Sleep parameters(sleep onset latency, sleep efficiency, total sleep time, wake after sleep onset, subjective sleep quality) 4. Volume of activity	—

Countries

Japan

Contacts

Public ContactTatsuya Yanagawa

Shionogi & Co., Ltd. Digital Intelligence department

tatsuya.yanagawa@shionogi.co.jp080-2506-1404

Outcome results

None listed

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