Satou Yuka, Ando Hideo, Nakiri Makoto, Nagatomi Kaori, Yamaguchi Yoshie, Hoshino Michiko, Tsuji Yoshiyasu, Muramoto Junko, Mori Mihoko, Hara Kunio, Ishitake Tatsuya
Department of Environmental Medicine, Kurume University School of Medicine, Karume, Japan.
Ind Health. 2007 Apr;45(2):217-23. doi: 10.2486/indhealth.45.217.
To investigate the relationships between whole-body vibration and changes in wakefulness, We measured the change of a subjective wakefulness level and electroencephalogram (EEG). Subjects are ten healthy male university students. The subjects were exposed to whole-body vibration with frequency (10 Hz) and acceleration level (0.6 ms(-2) r.m.s.) for 12 min in the seated position. Subjective wakefulness level was evaluated using the questionnaire of VASS (Visual Analog Sleepiness Scale) and KSS (The Kwansei Gakuin Sleepiness Scale). For the electroencephalogram (EEG) measurement, AAT (Alpha Attenuation Test) which repeats three times each opened and closed eye for 1 min was conducted. Wakefulness levels were defined as the ratio of mean alpha-wave power during eyes closed versus eyes opened. VASS and KSS increased and subjective level of wakefulness decreased from pre- to post exposure in all subjects, regardless of vibration exposure. The objective wakefulness levels of AAT were reduced at the post-exposure test in all subjects. In the case with exposure to whole-body vibration was a significant difference from the case without exposure to whole-body vibration. It is suggested that a short-term exposure to whole-body vibration may cause a reduction of wakefulness level.
为了研究全身振动与清醒状态变化之间的关系，我们测量了主观清醒水平和脑电图（EEG）的变化。受试者为十名健康的男性大学生。受试者在坐姿下暴露于频率为10Hz、加速度水平为0.6ms(-2)均方根值的全身振动中12分钟。使用VASS（视觉模拟嗜睡量表）和KSS（关西学院嗜睡量表）问卷评估主观清醒水平。对于脑电图（EEG）测量，进行了AAT（阿尔法衰减测试），每次睁眼和闭眼1分钟重复三次。清醒水平定义为闭眼与睁眼期间平均阿尔法波功率的比值。所有受试者在暴露前后，VASS和KSS升高，主观清醒水平降低，无论是否暴露于振动。所有受试者在暴露后测试中AAT的客观清醒水平降低。暴露于全身振动的情况与未暴露于全身振动的情况存在显著差异。这表明短期暴露于全身振动可能会导致清醒水平降低。
