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Effects of bright light exposure on heart rate variability during sleep in young women
Author(s) -
Kohsaka Masako,
Kohsaka Shinobu,
Fukuda Noriko,
Honma Hiroshi,
Sakakibara Satoshi,
Kawai Ikuko,
Miyamoto Tamaki,
Kobayashi Riko
Publication year - 2001
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1046/j.1440-1819.2001.00861.x
Subject(s) - evening , heart rate variability , autonomic nervous system , polysomnography , sleep (system call) , heart rate , medicine , slow wave sleep , cardiology , morning , audiology , electroencephalography , physics , blood pressure , psychiatry , apnea , astronomy , computer science , operating system
To investigate the effects of evening bright light on the autonomic nervous system, heart rate variability (HRV) during sleep was analyzed in dim light (DL) and bright light (BL) conditions. We recorded polysomnography in nine healthy young women aged 20–21 years. Time series of % delta power was calculated in the 0.49–2.20 Hz band. Heart rate variability was analyzed from a 10‐min segment of slow wave sleep. The low‐ to high‐frequency ratio and the low‐frequency component decreased significantly in the BL conditions compared with the DL conditions. However, the power of the high‐frequency component did not change in the two conditions. These results indicate that evening BL affects the autonomic nervous system during slow wave sleep.