Energy-efficient and Health Promoting Light for Elderly People

A Study of Two Different Light Conditions for Healthy Subjects Above 65 Years

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT02216318

Acronym

light-age

Enrollment

Registered

2014-08-13

Start date

2013-10-31

Completion date

2013-12-31

Last updated

2018-08-06

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

Conditions

Sleep

Keywords

sleep, circadian, melatonine, pupil response

Brief summary

to investigate the effect of two lightning conditions on sleep hypothesizing that sleep length is influenced by the color of light during daytime

Detailed description

Lightning conditions seems to be important for the length and quality of sleep, as light have an influence on the production of the sleep hormone (melatonin) and the the circadian rhythm. Entrainment of the circadian rhythm to the surroundings is accomplished by light-sensitive retinal ganglion cells and these cells are sensitive to blue light. Based on previous research, blue light early in the day and abscence of blue light during evening is important for the entrainment. In this study, lightning conditions in the home of healthy subjects are set to either blue enriched or red enriched from 8 a.m to 1. p.m. The lightning condition is based on a randomization protocol in a cross-over study for 3 weeks in each condition, separated by a one week pause.

Interventions

OTHERblue light

Study design

Allocation

RANDOMIZED

Intervention model

CROSSOVER

Primary purpose

BASIC_SCIENCE

Masking

SINGLE (Subject)

Eligibility

Sex/Gender

ALL

Age

65 Years to 85 Years

Healthy volunteers

Yes

Inclusion criteria

* age 65 to 85 years

Exclusion criteria

* Conditions which will interfere by the primary endpoint as evaluated by the medical doctor

Design outcomes

Primary

Measure	Time frame	Description
Sleep length	1 week	The mean of sleep length during the last week of each light period

Secondary

Measure	Time frame	Description
actigraphy	1 week	mean sleep efficiency during the last week in each light period

Other

Measure	Time frame	Description
pupillometry	the last day of each light period	the pupillary response to blue and red light
melatonin	the last day of each light period	timing of melatonin onset
Questionnaire	3 weeks	Questionnaire count

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026