the experiment was conducted
with different combinations of temperatures, relative humidity and
work intensities. The environment conditions are shown in Table 2.
During the experiment, the work intensities were divided
into three kinds [18,19]: light work, moderate work and heavy
work. Sitting was selected as a light work, running on a treadmill
with a speed of 3.5 km/h was considered as a moderate work,
and running with a speed of 5.5 km/h was regarded as a heavy
work. In the real life, office work would be a light work, picking
fruit or transporting medium heavy items may be a moderate
work, and mining or transporting heavy items would be a heavy
work [19].
All subjects were asked to take part in all types of experiment
conditions.