Study on Effects of Medical Surgical Masks on Human Comfort in Different Thermal Environments
To investigate the effects of medical-surgical masks(MSMs)on human thermal and breathing comfort at different temperatures,experimental conditions including three temperatures and three different activity levels were designed.Fifteen subjects constituted an experimental group wearing MSMs and a control group not wearing MSMs.The data of thermal comfort vote(TCV),thermal sensation vote(TSV),breathing comfort vote(BCV)and the electrocardiograms(ECGs)for heart rate variability(HRV)of subjects were collected.The results showed that wearing a MSM shortly has no effect on the overall thermal sensation.In the thermal comfort environment,the MSM has a significant effect on thermal comfort,while in the thermal discomfort environment,temperature has a greater effect on thermal comfort.The MSMs could affect breathing comfort,and wearing a MSM while standing could increase the temperature range for breathing discomfort.The low frequency and high frequency(LF/HF)in the frequency domain indexes of HRV can be used as an indicator for evaluating thermal sensation,but there is no correlation between HRV and thermal sensation when wearing a MSM.
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