title: Autonomic nervous function after evening bright light therapy: spectral analysis of heart rate variability.
abstract: In order to investigate the effects of 5000 lx evening bright light on autonomic nervous function, a spectral analysis was used to assess heart rate variability in consecutive 5-min epochs just after 60 min of bright light therapy was given to 12 young women (range: 20-21 years of age). The study revealed that a low frequency band (LF) increased in bright light conditions (BL) in comparison with controlled conditions (CL). High frequency band (HF), LF:HF ratio and the coefficient of variance (CV R-R) were not significantly different between the two conditions. These results indicate that 5000 lx evening bright light may affect sympathetic nervous system activity in healthy women.
authors.affiliation: Department of Psychiatry and Neurology, Hokkaido University School of Medicine, Sapporo, Japan. sakaki@wa2.so-net.ne.jp
authors.forename: S
authors.initials: S
authors.lastname: Sakakibara
authors.forename: H
authors.initials: H
authors.lastname: Honma
authors.forename: M
authors.initials: M
authors.lastname: Kohsaka
authors.forename: N
authors.initials: N
authors.lastname: Fukuda
authors.forename: I
authors.initials: I
authors.lastname: Kawai
authors.forename: R
authors.initials: R
authors.lastname: Kobayashi
authors.forename: T
authors.initials: T
authors.lastname: Koyama
mesh_terms: D000328:Adult; D001143:Arousal / Q000502:physiology; D001341:Autonomic Nervous System / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology*; D004562:Electrocardiography; D005260:Female; D005583:Fourier Analysis; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D010789:Phototherapy; D012815:Signal Processing, Computer-Assisted; D013564:Sympathetic Nervous System / Q000502:physiology