Document Detail

The effect of colored illumination on heart rate variability.
MedLine Citation:
PMID:  16868362     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: We investigated the effects of illumination with colored fluorescent light on heart rate variability (HRV) and autonomic regulation. Previous examinations have only focused on full-spectrum fluorescent bright light as it is used for the therapy of seasonal affective disorder and disturbances of circadian rhythms. MATERIALS AND METHODS: In 3 experiments, 12 healthy volunteers were exposed for 10 min to red, green and blue fluorescent light of 700 lux, respectively. These illumination periods were followed and preceded by 15 min of darkness. HRV series were recorded within the last minutes of each illumination and darkness period. HRV analysis encompassed time domain variables, frequency domain variables and detrended fluctuation analysis (DFA). RESULTS: DFA yielded a highly significant increase of the self-similarity parameter aDFA under red and green illumination, while blue light was accompanied by a decrease. A spectral analysis revealed parallel behavior of very low frequency components in the range of 0.003-0.04 Hz. Green light also seemed to induce a reduction in high frequency components. CONCLUSIONS: Results show that colored light can influence HRV within minutes and that the effects of individual colors can be distinguished by HRV analysis.
Axel Schäfer; Karl W Kratky
Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't     Date:  2006-06-26
Journal Detail:
Title:  Forschende Komplementärmedizin (2006)     Volume:  13     ISSN:  1661-4119     ISO Abbreviation:  -     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-07-26     Completed Date:  2006-08-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  101269884     Medline TA:  Forsch Komplementmed     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  167-73     Citation Subset:  IM    
Institute for Experimental Physics, University of Technology, Vienna, Austria.
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MeSH Terms
Cardiovascular Physiological Phenomena / radiation effects*
Cross-Over Studies
Heart Rate / physiology*,  radiation effects*
Spectrum Analysis

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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