Study On Human Thermal Comfort And Respiratory System Immunity Based On Eeg Under Cold And Heat Shock

With the spread of respiratory infectious disease COVID-19,people attach great importance to the construction of indoor environment.As an important part of indoor environment evaluation,thermal comfort affects people’s work efficiency and mood,but unfortunately,the existing thermal comfort model does not specifically cover health.The human body can exchange heat and air directly with the external environment through the respiratory system,and the respiratory system immunity is the ability of the external microenvironment to directly affect the respiratory tract against pathogens.Immunoglobulin E(IgE)can be used as an indicator to characterize the immunity of healthy people,and it is a new opinion to study thermal comfort.In this study,three working conditions of temperature step change are set in the artificial climate chamber,that is,the low temperature environment changed from 15℃ to 18℃,24℃and 30℃ respectively.From the perspective of thermal comfort and health,the electroencephalograph(EEG)spectral power value is taken as the characteristic indicator,combined with subjective voting,forehead temperature,skin temperature and core temperature and other basic parameters.The relationship between thermal comfort and respiratory immunity indicator IgE is obtained,which provides a new direction for the study of thermal comfort.In this paper,the subjective data and objective physiological parameters of the experiment are analyzed,and it is pointed out that the forehead temperature can be used as an important parameter to study thermal comfort under temperature step-change environment.It is found that IgE concentration is significantly correlated with subjective vote value and forehead temperature.IgE concentration increases with the increase of thermal comfort,and IgE concentration is the highest in the environment near neutral temperature.The change of IgE concentration before and after thermal shock is further studied,and the thermal comfort vote is simplified into comfortable and uncomfortable categories.It is found that IgE concentration increases significantly when the transition to comfortable state.Secondly,Fast Fourier Transform is used to transform the EEG signal into eeg spectral power value under temperature step-change environment.Combining with subjective voting and forehead temperature to further explore the correlation between EEG region and thermal comfort.Research has shown that the frontal area power spectrum values can reflect the thermal stimulation of the human body in an ambient temperature,the cerebral cortex neurons potential fluctuation degree.The spectral power value decreases with the increase of comfort,and the spectral power value is the lowest in the environment near the neutral temperature.The frontal area of spectrum power value can be used as the thermal comfort characteristic of physiological indexes.Finally,explore the relationship between EEG and the respiratory system indicator IgE.Under various temperature differences,the greater the temperature difference between the two rooms,the more obvious the thermal stimulation effect,and the stronger the correlation between the spectral power value of frontal lobe and IgE concentration.There is a negative correlation between the change of spectral power in frontal lobe and the change of IgE concentration before and after temperature mutation,and the difference between them is the most significant at 24℃,which means that the spectral power in frontal lobe can be used as a characteristic parameter to study the change of IgE concentration.The ultimate goal of immunology and microenvironment building research is to create a comfortable and healthy indoor environment while improving work efficiency.The combination of immunology and human thermal comfort research is of great significance to the formation of scientific understanding,reasonable evaluation of the existing thermal environment,and the creation of a comfortable and healthy indoor environment.