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.