According to the above regression model,the effect of temperature and relative humidity on physiological parameters could be calculated as follows by obtaining the mixed partial derivative [24]: STH? SHT?vPPvTvH? 2dT ? e(4)
In the experiment, the physiological parameters at the terminated time of the work were adopted to represent the physiological responses. The results of the multiple regressions between environment parameters and physiological parameters are shown in Table 3.
According to the data in Table 3 and Eq. (4), the values of mixed partial derivative could be calculated and the results are shown in Fig.1.
As shown in Fig. 1, the values of mixed partial derivative for the four physiological parameters were all positive, thus there were same fluctuant trends between temperature, relative humidity and STH. So the combined effect between temperature and relative humidity existed.
According to the above regression model,the effect of temperature and relative humidity on physiological parameters could be calculated as follows by obtaining the mixed partial derivative [24]: STH? SHT?vPPvTvH? 2dT ? e(4)In the experiment, the physiological parameters at the terminated time of the work were adopted to represent the physiological responses. The results of the multiple regressions between environment parameters and physiological parameters are shown in Table 3.According to the data in Table 3 and Eq. (4), the values of mixed partial derivative could be calculated and the results are shown in Fig.1.As shown in Fig. 1, the values of mixed partial derivative for the four physiological parameters were all positive, thus there were same fluctuant trends between temperature, relative humidity and STH. So the combined effect between temperature and relative humidity existed.
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