(1)
The combined effect caused by temperature and relative humidity existed;
(2)
With the increase of temperature, the temperature effect always increased and with the increase of relative humidity, the humidity effect increased. In addition, the combined effect caused by the environment factors also increased with the increase of temperature and relative humidity under most conditions, and the values of effects were always positive.
(3)
When the experiment intensity was large, the combined effect caused by temperature and relative humidity may be larger than the accumulation of these two effects.
(4)
The enthalpy was shown to be able to reflect the effect of temperature and relative humidity on physiological parameters comprehensively. The combined effect between enthalpy and work intensity in the experiment was positive under most conditions.