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Psychiatry Clin Neurosci. 2000 Jun;54(3):363-4.

Autonomic nervous function after evening bright light therapy: spectral analysis of heart rate variability.

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Department of Psychiatry and Neurology, Hokkaido University School of Medicine, Sapporo, Japan.


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.

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