Environment with the temperature above 32 °C and relative humidity above 60% can be considered as hot and humid environment [1]. With the rapid developments of economy and technology, hot and humid environments are prevalent in workplaces, such as steel mills, laundries, glass and ceramic units, deep mines, aviations, metallurgy manufactures, rubber foundries, dye houses, military facilities and some outdoor sport activities [2], [3] and [4].
When working in hot and humid environments, the physiological parameters such as heart rate, body temperature, blood pressure and sweat production will obviously change[5]. In hot and humid environments, more blood is provided by the heart to the skin to discharge the extra heat to the relative cooler environment, and the sweating is strengthened to cool the human body. If the extra heat is not fully dissipated, heat storage will occur and the core temperature will increase [6], [7] and [8]. Heat exposure will cause cramps, heat stroke, heat exhaustion, and even exacerbate the underlying medical conditions, such as lung or heart disease
Environment with the temperature above 32 °C and relative humidity above 60% can be considered as hot and humid environment [1]. With the rapid developments of economy and technology, hot and humid environments are prevalent in workplaces, such as steel mills, laundries, glass and ceramic units, deep mines, aviations, metallurgy manufactures, rubber foundries, dye houses, military facilities and some outdoor sport activities [2], [3] and [4].When working in hot and humid environments, the physiological parameters such as heart rate, body temperature, blood pressure and sweat production will obviously change[5]. In hot and humid environments, more blood is provided by the heart to the skin to discharge the extra heat to the relative cooler environment, and the sweating is strengthened to cool the human body. If the extra heat is not fully dissipated, heat storage will occur and the core temperature will increase [6], [7] and [8]. Heat exposure will cause cramps, heat stroke, heat exhaustion, and even exacerbate the underlying medical conditions, such as lung or heart disease
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