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How Light and Other Daily Cues Influence Biological Rhythms in Humans

Comparative Biological Study of Non-Photic and Photonic Zeitgebers in Regulating Physiological and Behavioral Rhythms

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
ChiCTR
Registry ID
ChiCTR2500115079
Enrollment
Unknown
Registered
2025-12-22
Start date
2026-01-01
Completion date
Unknown
Last updated
2026-01-05

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

circadian rhythm

Interventions

Blind group:Phase I: At-Home Observation Participants will take part while maintaining their normal work and daily routines, with all meals provided by the study team. During this phase, they will wea

Sponsors

The First Affiliated Hospital of the University of Science and Technology of China
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: Totally Blind Group (30 participants): 1. Individuals who have undergone bilateral enucleation, have bilateral ocular atrophy, or have no light perception in both eyes for more than 3 years; 2. Visual acuity testing shows no light perception in both eyes; 3. Visual field testing shows no detectable field in both eyes; 4. Visual Evoked Potentials (VEP) in both eyes show no clear waveform; 5. Direct and consensual pupillary light reflexes are absent in both eyes (for those with eyes present); 6. Imaging confirms the absence of both eyes (for those with bilateral ocular atrophy or enucleation); 7. Age 18-60 years. Normal Control Group (30 participants): 1. Corrected visual acuity of both eyes >= 0.8; 2. Visual field and VEP within normal range in both eyes; 3. No history of ocular organic disease or surgery; 4. Age 18-60 years.

Exclusion criteria

Exclusion criteria: 1. Severe or poorly controlled systemic diseases, such as diabetes, hypertension, etc.; 2. Subjects unsuitable for this project due to psychological or sleep rhythm assessments; 3. Patients with a history of neurological disorders.

Design outcomes

Primary

MeasureTime frame
salivary melatonin circadian rhythm;body temperature circadian rhythm;Blood metabolomics data;

Secondary

MeasureTime frame
sleep-wake circadian rhythm;blood glucose circadian rhythm;

Countries

China

Contacts

Public ContactYonghao Gu

The First Affiliated Hospital, University of Science and Technology of China

jianjunm@ustc.edu.cn+86 135 0560 8975

Outcome results

None listed

Source: ChiCTR (via WHO ICTRP) · Data processed: Feb 4, 2026