Impact of Cognitive Tasks on CO2 and Isoprene Emissions from Humans
Impact of Cognitive Tasks on CO2 and Isoprene Emissions from Humans
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DOI：
10.1021/acs.est.0c03850
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发表时间：
2021-01-05
影响因子：
11.4
通讯作者：
Laguerre, Aurelie
中科院分区：
文献类型：
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作者：
Gall, Elliott T.;Mishra, Asit Kumar;Laguerre, Aurelie
人体会排放多种化学物质，包括二氧化碳和异戊二烯。为了检查认知任务对人类二氧化碳和异戊二烯排放量的影响，我们在一个有16名成年人参与的控制室中进行了一项跨学科的平衡研究。这个会议厅复制了一个办公环境。在四人一组中，参与者分别参与30分钟的认知任务(紧张活动)和观看自然纪录片(放松活动)。测量的生物标记物表明，在应激活动期间获得了更高的应激水平。压力活动的人均二氧化碳排放量大于放松活动(30.3+/-2.1vs27.0+/-7.7g/h/p，p=0.0044，平均+/-标准差)。与放松运动相比，压力运动下的异戊二烯排放速率也有所增加(154ug/h/p比116ug/h/p，p=0.041)。燃烧室温度保持在26.2+/-0.49摄氏度不变；温度的偶然变化不能解释排放率的变化。异戊二烯释放率与唾液α-淀粉酶水平呈线性关系(r(2)=0.6，p=0.02)。这些结果暗示了在确定建筑通风量时考虑认知任务的可能性。他们还提出了通过测量空气质量来监测乘员认知任务指标的可能性。
The human body emits a wide range of chemicals, including CO2 and isoprene. To examine the impact of cognitive tasks on human emission rates of CO2 and isoprene, we conducted an across-subject, counterbalanced study in a controlled chamber involving 16 adults. The chamber replicated an office environment. In groups of four, participants engaged in 30 min each of cognitive tasks (stressed activity) and watching nature documentaries (relaxed activity). Measured biomarkers indicated higher stress levels were achieved during the stressed activity. Per-person CO2 emission rates were greater for stressed than relaxed activity (30.3 +/- 2.1 vs 27.0 +/- .7 g/h/p, p = 0.0044, mean +/- standard deviation). Isoprene emission rates were also elevated under stressed versus relaxed activity (154 +/- 25 mu g/h/p vs 116 +/- 20 mu g/h/p, p = 0.041). The chamber temperature was held constant at 26.2 +/- 0.49 degrees C; incidental variation in temperature did not explain the variance in emission rates. Isoprene emission rates increased linearly with salivary a-amylase levels (r(2) = 0.6, p = 0.02). These results imply the possibility of considering cognitive tasks when determining building ventilation rates. They also present the possibility of monitoring indicators of cognitive tasks of occupants through measurement of air quality.