White Light During Daytime Does Not Improve Alertness in Well-rested Individuals.
J Biol Rhythms
; 33(6): 637-648, 2018 12.
Article
em En
| MEDLINE
| ID: mdl-30191761
ABSTRACT
Broad-spectrum light applied during the night has been shown to affect alertness in a dose-dependent manner. The goal of this experiment was to investigate whether a similar relationship could be established for light exposure during daytime. Fifty healthy participants were subjected to a paradigm (0730-1730 h) in which they were intermittently exposed to 1.5 h of dim light (<10 lux) and 1 h of experimental light (24-2000 lux). The same intensity of experimental light was used throughout the day, resulting in groups of 10 subjects per intensity. Alertness was assessed with subjective and multiple objective measures. A significant effect of time of day was found in all parameters of alertness ( p < 0.05). Significant dose-response relationships between light intensity and alertness during the day could be determined in a few of the parameters of alertness at some times of the day; however, none survived correction for multiple testing. We conclude that artificial light applied during daytime at intensities up to 2000 lux does not elicit significant improvements in alertness in non-sleep-deprived subjects.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Descanso
/
Atenção
/
Ritmo Circadiano
/
Fotoperíodo
/
Luz
Limite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article