Light Exposure on Alertness after Wake-Up in Healthy Men: Comparing Dim, Bright, Red, and Blue Light.

ABSTRACT:

Introduction

Light is a key factor in moderating human alertness, both subjective and objective. However, the methodology applies in research on the effects of exposure to light of different wavelengths and intensities on objective and subjective alertness varies greatly and evidence on objective alertness in particular is still inconclusive. Thus, the present, highly standardized within-subject laboratory study on N = 44 healthy males explored how LED light of different intensities (dim vs. bright light) and wavelengths (red vs. blue) affected objective (reaction time/RT) as well as subjective (sleepiness) alertness in the morning after wake-up.

Methods

Participants spent two separate nights in the laboratory and were exposed to either one of the two light intensities or co

SUBMITTER: Mekschrat L 

PROVIDER: S-EPMC11651340 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature