Abstract：
Eleven train drivers participated in the study during 1 night and 1 day journey (4.5 h) over the same route. Their EEG, EOG and ECG were recorded on portable tape recorders. The EEG records were subjected to spectral analysis (FFT) and the EOG was scored visually for slow eye movements (SEMs). The results showed that rated sleepiness increased sharply during the night journey. A similar pattern was seen for spectral power density in the alpha band, SEM and, to a lesser extent, also for power in the theta and delta bands. Heart rate was low during the entire night drive. The day journey showed low values without any trend for all variables. The intra-individual correlations were very high between rated sleepiness and, particularly, alpha and theta power density, as well as SEM. Further analyses showed that most of the night time increases in EEG/EOG parameters were confined to the 6 most sleepy subjects. Among these, 4 admitted to dozing off during the night drive and 2 of these 4 subjects failed to act on signals while exhibiting large bursts of alpha activity. It was concluded that EEG and EOG parameters closely reflect variations in sleepiness on the job and that these parameters, together with self-ratings, demonstrate that severe sleepiness may occur in train drivers during night work.
摘要：
11名火车司机在同一路线上的1晚和1天旅程（4.5h）中参加了这项研究。他们的脑电图,在便携式录音机上记录EOG和ECG。对EEG记录进行频谱分析（FFT），并对眼动缓慢（SEM）的EOG进行视觉评分。结果表明，额定嗜睡在夜间旅行中急剧增加。对于α波段的光谱功率密度也看到了类似的模式，SEM和，在较小程度上，也用于theta和delta波段的功率。整个晚上开车时心率都很低。日间旅程显示低值，所有变量都没有任何趋势。额定嗜睡与个体内的相关性非常高，特别是,α和θ功率密度，以及SEM。进一步的分析表明，EEG/EOG参数的大部分夜间增加仅限于6个最困倦的受试者。其中,4人承认在夜间开车时打瞌睡，这4名受试者中有2名未能对信号采取行动，同时表现出大量的alpha活动。结论是，EEG和EOG参数密切反映了工作中嗜睡的变化，并且这些参数，连同自我评级，证明火车司机在夜班期间可能会出现严重的嗜睡。
