Relationships between Changes in Arousal and Component Characteristics of Respiration

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  • SUZUKI Satoshi
    Department of Mechanical Engineering, Faculty of Engineering Science, Kansai University
  • SUGAWARA Keitaro
  • MATSUI Takemi
    Department of Management Systems Engineering, Graduate School of System Design, Tokyo Metropolitan University
  • ASAO Takafumi
    Department of Mechanical Engineering, Faculty of Engineering Science, Kansai University
  • KOTANI Kentaro
    Department of Mechanical Engineering, Faculty of Engineering Science, Kansai University

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  • 覚醒度変化と呼吸成分の関係性について
  • カクセイド ヘンカ ト コキュウ セイブン ノ カンケイセイ ニ ツイテ

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The present study examines relationships between changes in arousal and the component characteristics of respiration to determine whether the components could serve as an index of changes in arousal while driving. A steering operation task during simulated car driving was conducted for 40 minutes under controlled sleep durations and mealtimes. We monitored changes in the power spectrum of alpha-waves in brain waves and the usual indices of respiration such as respiratory variation, the Timing and the Driving. Moreover, alternative indices to assumed minute ventilation volume and the timing of maximum inspiratory flow were calculated. We found that respiratory rates decreased with decreasing arousal. We also confirmed a relationship between the appearance ratio of alpha waves and the timing of maximum inspiratory flow (r＝0.65). Although individual differences in results varied among some participants, a change in arousal was associated with the component characteristics of respiration. Information about respiration is usually regarded as incidental in studies of arousal. However, the present results show that respiration can be an important indicator of change in arousal.

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