Why the study?
Does 5000 lx evening bright light therapy affect autonomic nervous function in healthy young women?
Does 5000 lx evening bright light therapy affect autonomic nervous function in healthy young women?
Evening bright light therapy (5000 lx) increases the low-frequency band of heart rate variability, suggesting an effect on sympathetic nervous system activity in healthy young women.
May suggest sympathetic effects of evening light in healthy women; leaves open relevance for clinical populations or therapy.
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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Sakakibara et al. (2000) studied this question.
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