Inhibition of heart rate variability during sleep in humans by 6700 K pre-sleep light exposure

Keita Ishibashi, Shingo Kitamura, Tomoaki Kozaki, Akira Yasukouchi

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    26 Citations (Scopus)


    Two different spectral analyses of heart rate (HR) variability (HRV) were performed on seven young male subjects to evaluate the effects of different color temperatures of light exposure (6700 K, 5000 K, 3000 K) before sleep on cardiac vagal activity. In investigating HRV, we used an ordinary fast Fourier transform (FFT) and coarse graining spectral analysis (CGSA), which selectively extracts random fractal components from a given time series. The results showed that suppressions of HR during sleep after 6700 K light exposure were more inhibited than the other two lighting conditions. Increases in high-frequency (HF) components of HRV during sleep were also inhibited by 6700 K pre-sleep lighting. These results indicate that pre-sleep exposure to light of a higher color temperature may inhibit the enhancement of cardiac vagal activity during sleep. Moreover, significant HF alterations were shown in fractal-free HF (not in ordinary HF) components by CGSA. Because the HF component originates from respiratory sinus arrhythmia with periodical fluctuations, CGSA may be an appropriate approach for HRV evaluation during sleep.

    Original languageEnglish
    Pages (from-to)39-43
    Number of pages5
    JournalJournal of physiological anthropology
    Issue number1
    Publication statusPublished - 2007

    All Science Journal Classification (ASJC) codes

    • Human Factors and Ergonomics
    • Physiology
    • Orthopedics and Sports Medicine
    • Anthropology
    • Public Health, Environmental and Occupational Health
    • Physiology (medical)


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