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Physiological responses to elevated carbon dioxide concentration and mental workload during performing MATB tasks
Building and Environment ( IF 7.4 ) Pub Date : 2021-03-02 , DOI: 10.1016/j.buildenv.2021.107752
Jie Zhang , Xiaodong Cao , Xin Wang , Liping Pang , Jin Liang , Liang Zhang

Fifteen healthy male college-age students were exposed in an enclosed environmental chamber to investigate their physiological responses to elevated carbon dioxide (CO2) concentration and mental workload. During each CO2 exposure condition (1626 ± 306 ppm, 3562 ± 259 ppm and 5087 ± 318 ppm), a resting test was conducted first, and then the multi-attribute tasks with three different mental workload levels were performed in the order designed by the Latin square method. The breathing, electrocardiogram (ECG) and electroencephalogram (EEG) data were collected overlapping the period when participants were in the resting and task tests. The statistical analyses indicated that the elevated CO2 concentration had positive correlations with the breathing wave amplitude, the percentage of adjacent normal-to-normal intervals that differ from each other by more than 50 ms (pNN50), and the beta relative power of EEG during the task tests, but no significant response was observed during the resting test. The elevated mental workload was associated with increased arousal level as indicated by the decreased standard deviation of the normal-to-normal interval (SDNN), increased respiration rate and higher beta relative power of EEG, which could help explain the inverted U-shaped effect of mental workload on task performance. The physiological responses indicated that more effort was required to accomplish tasks when participants were exposed to high CO2 concentration or heavy mental workload, which led to a direct impact on task performance. The order of CO2 exposures was not balanced among the participants, which should be considered as a major limitation of this study.



中文翻译:

在执行MATB任务期间对二氧化碳浓度升高和精神负荷的生理反应

15名健康的男大学生在封闭的环境室内暴露,以调查他们对二氧化碳(CO 2)浓度升高和精神负荷的生理反应。在每种CO 2暴露条件下(1626±306 ppm,3562±259 ppm和5087±318 ppm),首先进行静息测试,然后按照以下设计顺序执行具有三种不同心理工作量水平的多属性任务:拉丁方法。在参与者进行休息和任务测试的这段时间内,收集其呼吸,心电图(ECG)和脑电图(EEG)数据。统计分析表明,CO 2升高浓度与呼吸波幅度,相距超过50毫秒的相邻正常-正常间隔百分比(pNN50)以及任务测试期间脑电图的beta相对功率呈正相关,但无显着响应在静息测试中观察到。正常工作时间间隔(SDNN)的标准差降低,呼吸频率增加和脑电图的β相对能力增强表明,精神工作量增加与唤醒水平增加有关,这可能有助于解释倒U型效应工作量对任务绩效的影响。生理反应表明,当参与者暴露于高CO 2时需要更多的精力来完成任务注意力集中或精神工作量大,直接影响任务绩效。参与者之间的CO 2暴露顺序不均衡,这应被视为本研究的主要限制。

更新日期:2021-03-07
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