Light Intervention for Adaptation to Night Work

Summary

The project will contribute with new knowledge concerning how aspects of the physical work environment (lighting conditions) can be arranged to facilitate the workers' adaptation to night work. This is important given the reported adverse consequences of shift work for performance, safety, and health. The project involves a series of three experimental, laboratory based shift work simulation studies. The aim is to investigate how different lighting conditions (intensities and colour temperature), administered through light emitting diode (LED) based bright light integrated standard room lighting, affects adaptation to three consecutive simulated night shifts and re adaptation to a day oriented schedule on measures of alertness, cognitive performance, sleep and circadian rhythm. The proposed project examines the effects of interventions that can be applied in naturalistic settings and will be based on new laboratory infrastructure available at the laboratories situated in the Faculty of Psychology, University of Bergen.

Conditions

• Shift-Work Related Sleep Disturbance
• Sleep Deprivation
• Sleep

Interventions

DEVICE

LED-light, 1000 lux

Full-spectrum light, 1000 lux, 4000 K. Represent a light intensity within acceptable range (light that is not too glary); 4000 K is among the most commonly used indoor light colour temperatures.

DEVICE

LED-light, 100 lux

Full-spectrum light, 100 lux, 4000 K. Represent a light intensity within acceptable range (light that provides sufficient eye sight); 4000 K is among the most commonly used indoor light colour temperatures.

DEVICE

LED-light, 7000 K

Full-spectrum light, 7000 K, 200 lux. Represent the upper border of common colour indoor light temperature, 200 lux is a common indoor light intensity.

DEVICE

LED-light, 2500 K

Full-spectrum light, 2500 K, 200 lux. Represent the lower border of common colour indoor light temperature, 200 lux is a common indoor light intensity.

DEVICE

Blue LED-light

Blue light with peak wavelength 455 nm. Known to delay the circadian rhythm, suppress melatonin, and increase alertness.

DEVICE

Red LED-light

Red light with peak wavelength 615 nm. Known not to affect the circadian rhythm, melatonin, and alertness.

Sponsors & Collaborators

• Glamox

  collaborator UNKNOWN

• University of Bergen

  lead OTHER

Principal Investigators

• Erlend Sunde · University of Bergen, department of psychosocial science

Study Design

Allocation

RANDOMIZED

Purpose

SUPPORTIVE_CARE

Masking

SINGLE

Model

CROSSOVER

Eligibility

Min Age

19 Years

Max Age

30 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2017-08-25

Primary Completion

2019-03-27

Completion

2019-03-27

Countries

• Norway

Study Locations