知的作業時の精神疲労に及ぼす航空機騒音の影響--防音室内曝露実験

• 資料種別: 記事
• タイトル: 知的作業時の精神疲労に及ぼす航空機騒音の影響--防音室内曝露実験
• 著者・編者: 国武 栄三郎; 石西 伸; 児玉 泰
• 著者標目: 国武 栄三郎; 石西 伸; 児玉 泰
• タイトル（掲載誌）: 日本衛生学雑誌 = Japanese journal of hygiene
• 巻号年月日等（掲載誌）: 30(3) 1975.08
• 掲載巻: 30
• 掲載号: 3
• 掲載ページ: p417～429
• 掲載年月日（W3CDTF）: 1975-08
• ISSN（掲載誌）: 0021-5082
• ISSN-L（掲載誌）: 0021-5082
• 出版事項（掲載誌）: 東京 : 日本衛生学会
• 出版地（国名コード）: JP
• 本文の言語コード: jpn
• NDLC: ZS17
• 対象利用者: 一般
• 記事種別、記事分類: 記事分類: 医学--衛生学・公衆衛生--学校衛生 ; 環境科学・自然災害・防災科学--騒音・振動
• 所蔵機関: 国立国会図書館
• 請求記号: Z19-194
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館雑誌記事索引; https://ndlsearch.ndl.go.jp
• 書誌ID（NDLBibID）: 1616106; http://id.ndl.go.jp/bib/1616106
• 整理区分コード: 632

• 要約等: Studies of mental fatigue caused by exposure to the aircraft noise was carried out experimentally on 9 female students engaged in some intellectual performance. The tape-recorded noise of the flying Jet engine was controlled from 85dB(A) to 95dB(A) in the peak level. The subjects were exposed continuously to the noise during 50 minutes and 100 minutes, respectively, in an insulated room protected from general outer noise.<BR>Through the noise exposure period, the subjects performed intellectual tasks, that is, the Kraepelin- Uchida's test and card-sorting test. At the same time, pulse rates and pulse waves of their fingertips were measured. Before and after each exposure, the mental fatigue was measured by the critical fusion frequency (C.F.F.), the color naming test (C.N.) and the discriminative reaction of the multiple performance test (M.P.). And the information of subjective sensations of human fatigue were collected by the questionnaire, Cornal Medical Index (C.M.I.) were used for psychophysiological complaints. The control data of each subject were obtained by the same experiment except noise.<BR>The following conculusions were derived from observations. The grade of mental fatigue increased in the case of the noise exposure rather than in the case of the noiseless situation. In C.F.F., fatigue increased 13% under noise exposure of 50 minutes, 37% under that of 100 minutes. In C.N. and M.P. as wel as C.F.F. the same gradiance between the noise exposure and fatigue were found. Furthermore, fatigue revealed itself more clearly in C.N. than in C.F.F., namely, the rate of prolongation of the time required for color identifying exceeded the critical level of mental fatigue, while the rate of mental fatigue in C.F.F. was within the normal or allowable range.<BR>The results of the questionnaire of subjective sensations of fatigue and of the C.M.I. in the case of the noise exposure showed no remarkable differences compared with those of the noiseless situation. But, it was found that some complaints of sensations of fatigue increased slightly during noise exposure compared with those in the noiseless situation. These complaints were the symptoms probably caused by the sympagotonic hypertension. Moreover, from the observation of the pulse rates and pulse waves, it was recognized that a biological lags of the relaxation of the sympathetic nerves system might occur when they were released from the intellectual tasks.<BR>From the observation mentioned above, it is considered that there is a posibility of the inhibition of the learning effectiveness in school children when they are exposed to the aircraft noise such as the subjects were exposed to in this experiment. The exposed aircraft noise level used in this study, calculated from the peak levels and flying numbers, corresponds to 80 W.E.C.P.N.L.. It can be said that mental fatigue is induced markedly by the noise of 80 W.E.C.P.N.L.. It is suggested that the noise level of 80 W.E.C.P.N.L. is not harmless to human being in the case of intellectual performance, especially during school hours.
• DOI: 10.1265/jjh.30.417
• オンライン閲覧公開範囲: インターネット公開
• 連携機関・データベース: 科学技術振興機構 : J-STAGE; http://www.jstage.jst.go.jp

• 要約等: Studies of mental fatigue caused by exposure to the aircraft noise was carried out experimentally on 9 female students engaged in some intellectual performance. The tape-recorded noise of the flying Jet engine was controlled from 85dB(A) to 95dB(A) in the peak level. The subjects were exposed continuously to the noise during 50 minutes and 100 minutes, respectively, in an insulated room protected from general outer noise.<BR>Through the noise exposure period, the subjects performed intellectual tasks, that is, the Kraepelin- Uchida's test and card-sorting test. At the same time, pulse rates and pulse waves of their fingertips were measured. Before and after each exposure, the mental fatigue was measured by the critical fusion frequency (C.F.F.), the color naming test (C.N.) and the discriminative reaction of the multiple performance test (M.P.). And the information of subjective sensations of human fatigue were collected by the questionnaire, Cornal Medical Index (C.M.I.) were used for psychophysiological complaints. The control data of each subject were obtained by the same experiment except noise.<BR>The following conculusions were derived from observations. The grade of mental fatigue increased in the case of the noise exposure rather than in the case of the noiseless situation. In C.F.F., fatigue increased 13% under noise exposure of 50 minutes, 37% under that of 100 minutes. In C.N. and M.P. as wel as C.F.F. the same gradiance between the noise exposure and fatigue were found. Furthermore, fatigue revealed itself more clearly in C.N. than in C.F.F., namely, the rate of prolongation of the time required for color identifying exceeded the critical level of mental fatigue, while the rate of mental fatigue in C.F.F. was within the normal or allowable range.<BR>The results of the questionnaire of subjective sensations of fatigue and of the C.M.I. in the case of the noise exposure showed no remarkable differences compared with those of the noiseless situation. But, it was found that some complaints of sensations of fatigue increased slightly during noise exposure compared with those in the noiseless situation. These complaints were the symptoms probably caused by the sympagotonic hypertension. Moreover, from the observation of the pulse rates and pulse waves, it was recognized that a biological lags of the relaxation of the sympathetic nerves system might occur when they were released from the intellectual tasks.<BR>From the observation mentioned above, it is considered that there is a posibility of the inhibition of the learning effectiveness in school children when they are exposed to the aircraft noise such as the subjects were exposed to in this experiment. The exposed aircraft noise level used in this study, calculated from the peak levels and flying numbers, corresponds to 80 W.E.C.P.N.L.. It can be said that mental fatigue is induced markedly by the noise of 80 W.E.C.P.N.L.. It is suggested that the noise level of 80 W.E.C.P.N.L. is not harmless to human being in the case of intellectual performance, especially during school hours.
• DOI: 10.1265/jjh.30.417; https://doi.org/10.1265/jjh.30.417
• オンライン閲覧公開範囲: インターネット公開
• 関連情報（URI）: http://id.ndl.go.jp/bib/1616106; https://ndlsearch.ndl.go.jp/books/R000000004-I1616106; http://www.jstage.jst.go.jp/article/jjh1946/30/3/30_3_417/_pdf; https://search.jamas.or.jp/link/ui/1976057426
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: Japan Link Center; https://japanlinkcenter.org/top; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; Crossref; https://www.crossref.org; CiNii Articles
• 書誌ID（NDLBibID）: 1616106; http://id.ndl.go.jp/bib/1616106
• NII論文ID: 130001000551; 10009533870