Effects of nighttime light intensity and blue light power measured by eye-level logger on melatonin suppression and diseases

2015 Fiscal Year Final Research Report

• Project/Area Number: 25461393
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Endocrinology
• Research Institution: Nara Medical University
• Principal Investigator: Tone Nobuhiro 奈良県立医科大学, 医学部, その他 (50630498)
• Co-Investigator(Kenkyū-buntansha): OBAYASHI Kenji 奈良県立医科大学, 医学部医学科, 助教 (30596656) ; SAEKI Keigo 奈良県立医科大学, 医学部医学科, 講師 (60364056)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 照度 / 短波長 / 夜間 / サーカディアンリズム / 睡眠 / 血圧 / メラトニン / 生体リズム

Outline of Final Research Achievements

Background: Although studies have reported the effects of nighttime light exposure on biological rhythms, there are few studies measuring light exposure at eye-level. Method and Results: In this cross-sectional study of 580 elderly individuals, we measured nighttime light exposure over two consecutive nights, using both the ambulatory eye-level light meter and a bedroom light meter facing the ceiling. Multivariable analysis indicated that the fitness of statistical models of the associations of nighttime light with melatonin secretion, sleep quality, and blood pressure, using the eye-level light meter, was better than those using the bedroom light meter. Conclusions: We demonstrated the accuracy for ambulatory eye-level measurement of nighttime light exposure in home settings.

Free Research Field

工学