131 EXPERIMENTAL STUDY ON PREDICTION OF SLEEP DURING WAKEFULNESS(O.S.5 Advanced Technology for Usage of Sound and Vibration III)

概要

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The feature of sleep pattern is determined by the circadian rhythm that is typified by the rhythm of body temperature and homeostasis. In this study, a method was conceived for capturing changes in the peripheral circulatory system during the process of lowering of core body temperature via finger plethysmogram. A finger plethysmogram was recorded during experiments with induced sleep tests in the lying position. Recorded signals were then analyzed by chaos analysis. 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 Stage 1 sleep 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.
社団法人日本機械学会の論文
2005-05-31