High temperature impairs cognitive performance during a moderate intensity activity
High temperature impairs cognitive performance during a moderate intensity activity
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高温会损害中等强度活动期间的认知能力
DOI：
10.1016/j.buildenv.2020.107372
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发表时间：
2020-12-01
影响因子：
7.4
通讯作者：
Liu, Weiwei
中科院分区：
文献类型：
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作者：
Chen, Yuyan;Tao, Meihui;Liu, Weiwei
高温是导致与认知障碍相关的工作安全事故的主要原因之一。然而，在中等强度活动期间，环境温度升高对认知性能的影响尚不清楚。在这项研究中，受试者（N = 32）暴露于四种不同的空气温度，即，26、30、33和37摄氏度，以及70%的相对湿度。在实验过程中，受试者被要求完成神经行为认知测试，同时在跑步机上行走，估计代谢率为165 W/m（2）。在90分钟的实验期间，测量鼓膜温度、体重减轻、心率和相差> 50 ms的相邻心搏间期的百分比（pNN 50）。在37 ℃条件下，运动45 min后，受试者对语义干扰和视知觉测试的反应准确性显著降低。此外，在37摄氏度的暴露期内，各种认知测试的准确性也有所下降，而速度则有所增加。在37摄氏度的认知测试结果的变化与鼓膜温度的升高，心率，脱水率，和下降的pNN 50。同样，升高的热不适和神经行为症状的强度与这些changes.In结论，暴露于37摄氏度的温度为45分钟有负面影响的准确性与中等活动强度的人员。因此，建议在37 ℃下以中等强度连续工作45分钟为安全时间。
High temperatures are one of the main causes of work safety accidents associated with cognitive impairment. However, the effects of elevated ambient temperature on cognitive performance during moderate-intensity activities are unclear. In this study, subjects (N = 32) were exposed to four different air temperatures, i.e., 26, 30, 33, and 37 degrees C, and a relative humidity of 70% in a climate chamber. During the experiment, the subjects were required to complete neurobehavioral cognitive tests while walking on a treadmill with an estimated metabolic rate of 165 W/m(2). During the 90-min experiment, the tympanic temperature, weight loss, heart rate, and percentage of adjacent inter-beat cardiac intervals differing by > 50 ms (pNN50) were measured. Subjective responses were collected using questionnaires.The accuracy of subjects' responses to the semantic interference and visual perception tests were significantly decreased at 37 degrees C after 45 min of exercise. Additionally, over the exposure period at 37 degrees C, the accuracy of various cognitive tests also decreased, while the speed increased. The changes in the cognitive test results at 37 degrees C were associated with the elevation of the tympanic temperature, heart rate, dehydration rate, and decline of the pNN50. Similarly, the elevated thermal discomfort and intensity of neurobehavioral symptoms were related to these changes.In conclusion, exposure to a temperature of 37 degrees C for 45 min has a negative impact on the accuracy of personnel with moderate-activity intensity. Therefore, 45 min is recommended as a safe time for continuous work with moderate intensity at 37 degrees C.