Effect of Newly Developed LED Lighting on Improving Sleep Quality and Living Comfort in an Indoor Environment
10.1625/jcam.9.31
- VernacularTitle:新開発 LED 照明による室内環境が睡眠改善および快適性に及ぼす効果
- Author:
Osami KAJIMOTO
;
Yukishige SHIRAICHI
;
Masaki OHTSUKA
;
Toshihiro SENOO
;
Shoko KAWAZOE
;
Tomohiro SUGINO
- Publication Type:Journal Article
- Keywords:
LED lighting;
indoor environment;
sleep;
living comfort;
fatigue
- From:Japanese Journal of Complementary and Alternative Medicine
2012;9(1):31-41
- CountryJapan
- Language:Japanese
-
Abstract:
Objective: In the present study, we conducted a clinical study to investigate the effect of newly developed LED lighting on improving sleep quality and living comfort in an indoor environment.
Design: Twelve healthy male subjects, whose Pittsburgh Sleep Quality Index (PSQI) scores were ≥5 participated in a randomized crossover trial. On the first day, as a sleep evaluation period, subjects rested from 21:00 to 22:00 under the newly developed lighting or ordinary lighting, went to bed at 22:00 and got up at 7:00. On the second day, as an evaluation period of daytime use, they performed a mental load for 4 hours under each lighting condition. We evaluated the quality of sleep by SLEEP SCAN and the St. Mary’s Hospital sleep questionnaire, and daytime performance by Uchida-Kraepelin psychodiagnostic test and advanced trail-making test (ATMT).
Result: The newly developed lighting improved the quality of sleep and increased comfortable feelings among participants; moreover, in daytime use, the environment did not induce impaired performance in spite of lower illumination.
Conclusion: This newly developed LED lighting produces suitable illumination and color temperature before sleeping and is useful for improving the living comfort in an indoor environment.
