Evaluation of human cognitive performance using heart rate variability under sustained near-high temperature exposure
10.16289/j.cnki.1002-0837.2024.02003
- VernacularTitle:持续近高温暴露下基于心率变异性的认知表现评价方法
- Author:
Hui ZHU
1
;
Yufei WANG
;
Yichao WANG
;
Kun GAO
;
Hua SU
Author Information
1. 青岛理工大学环境与市政工程学院,青岛 266520
- Keywords:
Heart rate variability;
Cognitive performance;
Environmental temperature;
Exposure time;
Task load
- From:Space Medicine & Medical Engineering
2024;35(2):84-90
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the influence of continuous thermal exposure on human cognitive performance.It provides solutions for the reduction of cognitive performance caused by high temperature emergency,and reduces the misoperation problems or even safety accidents of astronauts in high temperature emergency.Methods 14 right-handed male subjects were recruited and continuously exposed to four thermal environments of 32℃,35℃,38℃,and 41℃for 150 minutes,during which 5 different cognitive tasks(Posner Cueing Task,Deary-liewald Task,N-back Task,Wisconsin Card Task,Visual Search Task)were continuously performed to obtain relative cognitive performance.At the same time,a portable 2-lead holter was used to continuously capture ECG R signals during the cognitive test.Thereafter,the heart rate variability(HRV)analysis was conducted based on the ECG data,to explore the correlations between nonlinear indices(SD1,Shannon entropy,α2,D2)and the cognitive performance.Results Tresults showed that all nonlinear indexes changed with the exposure time and exposure temperature with certain patterns.In addition,through the correlation analysis between relative cognitive performance and nonlinear indicators,the most relevant indicator is α2(correlation coefficient 0.7).The correlation analysis results showed that the nonlinear index α2 had a U-shaped relationship with relative cognitive performance(correlation coefficient was 0.7).Based on that,a quantitative relationship between α2 and relative cognitive performance was obtained.It is found that when α2 was equal to 0.98,the worst relative cognitive performance was observed.Conclusion This study showed that the HRV nonlinear index α2 could serve as a reliable indicator of the cognitive performance of human during hot exposure,which provided a potential solution for the productivity and health evaluation of astronauts.
