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目的:以心率变异性指标对恒定精神负荷下的精神应激状况进行评判。方法:通过工效指标、眼动指标和主观问卷表,将30例样本分成疲劳组F、中间状态组M和非疲劳组N三类。分别以20min和5min对1小时的VDT作业进行分段,研究了各样本的工效指标和HRV指标的总体及实时性变化。结果:实验结果表明:1)以工作绩效评价疲劳程度有局限性;2)负荷、应激和疲劳相互关联,又相互区别;3)HRV直接反映的是应激水平,不能直接反映疲劳程度;4)对自主控制的应激反应与受迫型的应激反应必须区别对待;5)样本的个体差异十分显著。结论:单一的HRV指标不能实时测量疲劳程度,但可以实时的指示应激水平的变化;工效指标可以作为疲劳评判的参考指标,但不宜作为疲劳评判的唯一指标;以HR和HRV并结合其它指标来研究精神疲劳,有着强有力的生命力。
OBJECTIVE: To evaluate the mental stress under constant mental stress with heart rate variability index. Methods: Thirty patients were divided into three groups: fatigue group F, intermediate group M and non-fatigue group N through the indexes of ergonomics, eye movement and subjective questionnaire. The VDT operation was divided into 1 hour and 20 min respectively for 5 min to study the overall and real-time changes of the ergonomic index and HRV index of each sample. Results: The experimental results show that: 1) there is a limitation in assessing the degree of fatigue in work performance; 2) the load, stress and fatigue are interrelated and differentiated; 3) HRV directly reflects the stress level and can not directly reflect the degree of fatigue; 4) stress response to self-control and forced stress response must be treated differently; 5) the sample of individual differences are significant. Conclusion: A single HRV index can not measure the degree of fatigue in real time, but it can indicate the change of stress level in real time. Ergonomics index can be used as a reference index of fatigue assessment, but not as the only index of fatigue assessment. HR and HRV combined with other indicators To study mental fatigue, has a strong vitality.