指尖容積脈波情報を用いた入眠予兆現象計測法の開発

DOI Web Site 被引用文献13件 参考文献36件

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  • Development of the measurement method of the prediction of sleep by finger plethysmogram data
  • シセン ヨウセキ ミャクハ ジョウホウ オ モチイタ ニュウミン ヨチョウ ゲンショウ ケイソクホウ ノ カイハツ

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The feature of sleep mechanism is determined by the circadian rhythm and homeostasis that is typified by the rhythm of body temperature In this study, a method was conceived for capturing changes in the peripheral circulatory system effected by the circadian rhythm and homeostasis via changes in finger plethysmogram in Ultra Low Frequency (ULF) and Very Low Frequency (VLF). A finger plethysmogram was recorded during experiments with induced sleep tests in the lying and sitting positions. Recorded signals were then analyzed by chaos analysis, which calculates Lyapunov exponent. By analyzing the variations in the time series of the gradients of the largest Lyapunov exponent and the power value (the square of the finger plethysmogram amplitude), and by observing the conditions of the subject, the phenomenon that predicts the subject's transition to sleep stage 1 during wakefulness was detected. These predictive signals for falling asleep can be found when the amplitude of the power gradient was in transition, and when the largest Lyapunov exponent's gradient and the power gradient have an inverse phase with 180 degrees.

収録刊行物

  • 人間工学

    人間工学 41 (4), 203-212, 2005

    一般社団法人 日本人間工学会

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