Objective To assess mental fatigue by noninvasive monitoring of the physiological signals.Methods The changes in the physiological parameters including the electrodermal activity,heart rate and heart rate variability were analyzed in 14 subjects performing the reaction-time tasks when fatigue and changes in the reaction time occurred.Results The average skin conductance level,average heart rate,and heart rate variability parameters including the total power density,percentage of the very low power density,percentage of high power density all differed significantly between the sober state and the mental fatigue state.Conclusion Monitoring the physiological parameters including the electrodermal activity,heart rate and heart rate variability is a noninvasive,effective and practical approach to mental fatigue assessment.%目的 通过非介入式的生理参数的监测,评估精神疲劳.方法 根据实验对象的反应时间在反应时测试实验过程中伴随疲劳而发生的变化,记录14例实验对象疲劳过程前后的皮肤电活动、心率、心率变异性3组生理参数,并进行统计分析.结果 人体清醒和精神疲劳状态下的平均皮肤电导水平、平均心率、总功率密度、极低频功率密度占总功率密度百分比、高频功率密度占总功率密度百分比均有显著性差异.结论 通过监测皮肤电活动、心率和心率变异性等生理参数对人体精神疲劳进行评估的方法具有无创、有效和实用的特点,有较好的运用前景.
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