空気中のマイナスイオンが脳波に与える影響  [in Japanese] Effect of Negative Air Ion in Human Electroencephalogram  [in Japanese]

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Author(s)

    • 渡部 一郎 WATANABE Ichiro
    • 北海道大学医学部リハビリテーション医学講座 Department of Rehabilitation and Physical Medicine, School of Medicine, Hokkaido University
    • 真野 行生 MANO Yukio
    • 北海道大学医学部リハビリテーション医学講座 Department of Rehabilitation and Physical Medicine, School of Medicine, Hokkaido University

Abstract

High levels of negative ions have been detected in the air in forests, at spas, near waterfalls, and so forth, and there have been reported that they have a favorable effect on human beings' feeling of comfort and their feeling of fatigue. In this study we prepared an experimental room in which it was possible to maintain temperature constant at 25°C and constant humidity, and turn the supply of negative ions on and off, and in addition to assessing comfort level and fatigue level subjectively, we assessed them by means of the -wave component of the EEG, which indicates the degree of relaxation, and by auditory evoked potential P300, which reflects attentiveness and degree of fatigue.<br>Methods: The subjects were 15 healthy physicians and nurses. The experiment was conducted in a room maintained at a constant temperature of 25°C and a constant humidity of 50% during a 2-hour period on different days without informing the subjects of whether the air was loaded with negative ions or not. Constant temperature and humidity were maintained, and the level of negative ions was adjusted by using a shinki genertor (Geochto Ltd.). The parameters measured were determined with a flicker test and P300 (auditory evoked) test, and the α-wave ratio was calculated from the 60-minute closed-eye resting EEG.<br>Results: A higher percentage of subjects reported subjective comfort when the air was loaded with neagtive ions (6/15, 40%) than when it was not (4/15, 27%).<br>Significant difference was not observed in the P300 tests, but the α<sub>2</sub> (10-13Hz) ratio of the EEG and flicker test tended to be higher with negative ion-air than without nagative ion-air.

Journal

  • The Journal of The Japanese Society of Balneology, Climatology and Physical Medicine

    The Journal of The Japanese Society of Balneology, Climatology and Physical Medicine 61(3), 121-126, 1998-05

    The Japanese Society of Balneology, Climatology and Physical Medicine

References:  6

Cited by:  3

Codes

  • NII Article ID (NAID)
    10005968142
  • NII NACSIS-CAT ID (NCID)
    AN00186245
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00290343
  • NDL Article ID
    4492809
  • NDL Source Classification
    ZS47(科学技術--医学--治療医学・看護学・漢方医学)
  • NDL Call No.
    Z19-225
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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