Bright Light Intervention to Reduce Students' Stress

NCT ID: NCT04900675

Last Updated: 2025-06-26

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 125 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2020-10-01
• Study Completion Date: 2024-10-31

Brief Summary

Increased stress levels are a significant problem for many students and represent a risk factor for impaired mental and physical health as well as academic performance. Stress levels are particularly high during the preparation phase for major exams.

There is good evidence that light therapy is an effective treatment option to improve mood in affective disorders.

The present study aims at investigating the psychophysiological effects of a 3-week morning bright light exposure in reducing stress and stress-related problems in students preparing for major exams.

Detailed Description

Increased students' stress represents a significant risk factor for impaired mental and physical health as well as academic performance. The World Mental Health Survey (WHO) reports a 12-month prevalence of mental illness of 20.3% among students, with anxiety disorders (14.7%), affective disorders (9.9%), and substance abuse (6.7%) being particularly prominent. Moreover, six out of 10 students suffer from impaired sleep quality.

Offering an effective treatment for stress-related symptoms in students is a challenge. In situations of intense stress, conventional methods such as relaxation and mindfulness-based programs often fail because of poor prior practice. Only a few students apply cognitive behavioral interventions. Although medication might decrease stress symptoms within days, the side effects of drugs cannot be ignored. Therefore, there is a need for effective and efficient treatment of acute stress symptoms in students.

Bright light therapy is an effective treatment for several mental disorders, e.g. affective disorders and sleep disorders. There is some evidence, that exposure to bright light may even reduce stress in patients with burnout symptoms. Thus, exposure to bright light may be a promising new option to reduce academic stress and improve mood and sleep parameters.

In the present study, a large-area desk lamp, which emits diffuse light and is controllable in its luminance and correlated color temperature is used. Study participants are randomly assigned to one of three study arms: (i) exposure to polychromatic light of 5,000 lux and 5,300 Kelvin, (ii) exposure to polychromatic light of 50 lux and 2,200 Kelvin, or (iii) no light intervention. Data collection takes place in winter periods.

Conditions

Psychological Stress; Physiological Stress; Sleep Disorders, Circadian Rhythm

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: DOUBLE

Study Groups

bright white light intervention

exposure to 5,000 lux with polychromatic white light with 5,300 Kelvin at eye level; light exposure starts immediately after awakening; light exposure takes place on weekdays (Monday till Friday) over a period of 3 weeks

Group Type: EXPERIMENTAL

Bright light intervention

Intervention Type: OTHER

Exposure with 5,000 lux at eye level for one hour and a Correlated Color Temperature of 5,300 Kelvin every morning for three weeks.

dim reddish light intervention

exposure to 50 lux with polychromatic reddish light with 2,200 Kelvin at eye level; light exposure starts immediately after awakening; light exposure takes place on weekdays (Monday till Friday) over a period of 3 weeks

Group Type: PLACEBO_COMPARATOR

Reddish placebo light

Intervention Type: OTHER

Exposure with 50 lux at eye level for one hour and a Correlated Color Temperature of 2,200 Kelvin every morning for three weeks.

no light intervention

no light intervention takes place in the morning; the study participants follow their natural rhythm of life

Group Type: NO_INTERVENTION

No interventions assigned to this group

Interventions

Bright light intervention

Exposure with 5,000 lux at eye level for one hour and a Correlated Color Temperature of 5,300 Kelvin every morning for three weeks.

Intervention Type: OTHER

Reddish placebo light

Exposure with 50 lux at eye level for one hour and a Correlated Color Temperature of 2,200 Kelvin every morning for three weeks.

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• students from the faculty of medicine, pharmacy, and law
• major exam at least 5 weeks ahead
• major depressive disorder (PHQ-9): Score > 4
• possession of smartphone and data plan

Exclusion Criteria

• suicidal ideation (BDI, Item i): Rating > 1
• seasonal affective disorder (PIDS-A): Score > 11
• taking medication which increases photo-sensitivity
• taking medication to increase cognitive performance
• starting or changing pharmacotherapy for affective disorders and anxiety disorders within the last two weeks
• changing of all kinds of medication within the last two weeks
• headache (PHQ-D, Item f): Rating "severly impaired"
• increased light sensitivity: Item "Wearing sunglasses outside on sunny days" is answered with 'often' or 'very often'
• currently undergoing psychotherapeutic treatment
• the presence of an eye disease for which light therapy is contraindicated

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 35 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Bartenbach GmbH

UNKNOWN

Sponsor Role: collaborator

Universitaet Innsbruck

OTHER

Sponsor Role: lead

Responsible Party

Markus Canazei

Principal Investigator

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Markus Canazei, PhD

Role: PRINCIPAL_INVESTIGATOR

University of Innsbruck

Locations

University of Innsbruck

Innsbruck, Tyrol, Austria

Countries

Austria

Other Identifiers

878649

Identifier Type: -

Identifier Source: org_study_id