Zhang Aihua, Yang Hua, Kong Lingjie
College of Electrical and Information Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2011 Oct;28(5):1025-9, 1034.
A visual display terminal (VDT) mental fatigue task was designed to search for the objective indicator to diagnose and evaluate the VDT mental fatigue status. The signals of temperature and electrocardiograph (ECG) are collected from the subjects. The temperature, heart rate (HR) and heart rate variability (HRV) are extracted as the objective parameters after analyzing the temperature signals in time domain and the ECG signals in time domain and frequency domain. Compared with mental fatigue pre-experiment, the temperature increased significantly (P<0.001), and the RR-PNN50 increased obviously (P<0.05), while the S wavelet of ECG signals decreased obviously (P<0.05) after mental fatigue experiment. Compared with the end of mental fatigue experiment, the temperature increased, the changes of RR-PNN50 were not obvious, the S wavelet increased significantly (P<0.01), and the mental fatigue was somewhat remittance after natural recovery. The results showed that the objective indicator to evaluate the VDT mental fatigue status would be hopeful to be found out by analyzing the signals of temperature and ECG.
设计了一种视觉显示终端（VDT）脑力疲劳任务，以寻找用于诊断和评估VDT脑力疲劳状态的客观指标。从受试者身上采集温度和心电图（ECG）信号。在对温度信号进行时域分析以及对ECG信号进行时域和频域分析后，提取温度、心率（HR）和心率变异性（HRV）作为客观参数。与脑力疲劳实验前相比，脑力疲劳实验后温度显著升高（P<0.001），RR-PNN50明显增加（P<0.05），而ECG信号的S小波明显降低（P<0.05）。与脑力疲劳实验结束时相比，温度升高，RR-PNN50变化不明显，S小波显著增加（P<0.01），自然恢复后脑力疲劳有所缓解。结果表明，通过分析温度和ECG信号有望找出评估VDT脑力疲劳状态的客观指标。
