心拍RRIのローレンツプロット情報に着目した入眠移行期の簡易推定法(<特集>生体医工学シンポジウム2005)

概要

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The falling asleep period is the time when one shifts from being awake to sleep stages 1 and 2. The change during this period can be observed by monitoring brain waves. In this research, we developed a technique to presume the shift of sleeping depth during the period of falling asleep by monitoring brain waves. We used a Lorenz Plot for the heart rate RRI during the falling asleep period, enabling us to confirm that a change took place on the distribution of the Lorenz Plot, according to the change that occurred during the sleep stage. To evaluate the change in these distributions, we projected a Lorenz Plot on the y-x axis, and analyzed shifting of the center and variation in each sleep stage. As a result, the distance from the starting point to the center of distribution became longer for sleep stage 1 and sleep stage 2, and sleep became deeper from the waking stage. Distributions also began to stabilize gradually as the sleep stage became deeper, though they varied widely and were unstable during the waking stage. Evaluating these phenomena quantitatively, we can easily estimate the pathology of the sleep stage when one is falling asleep.
社団法人日本生体医工学会の論文
2006-03-10