The lab needs a good chair too.
The laboratory is the place where experiments are conducted, the cradle of science, the base of scientific research and the source of technological development. There is no shortage of lab tools and lab furniture you can see in the lab, with lab chairs being the most common. However, have you ever thought that a lab also needs a good chair? Because a good chair can make you "sit and talk without back pain".
A good chair should meet five criteria.
1, the height equal to the length of the calf: the height of the chair should be about equal to the length of the footboard to the knee, so that the feet just flat on the ground, thighs parallel to the ground, the calf and the ground perpendicular, so that the feet to maintain a most natural state.
2, the chair surface is about equal to the length of the thigh: the chair surface is too long, there is a gap between the back and the back of the chair, the back can not get back effective support; the shorter the chair surface, the more buttocks to bear the weight of the body.
3, the back of the chair to have a forward curve: people sitting, the weight of the upper body are concentrated in the lumbar region, resulting in the pressure on the lumbar intervertebral discs is at least 1.5 times the standing position, the back of the chair can help us bear part of the load. The human spine is a middle forward convex S-curve, chair back a little forward of the curvature, in order to fit with the curvature of the human lumbar spine, to achieve the "chair".
4, armrests can hold the elbow joints: armrests should be the right height, it is best to allow the upper limbs to relax on it, and not because it is too high or too low to pull the neck and shoulders or chest and back, lumbar back muscles, fascia and other soft tissues.
5, a wheel to turn more convenient: the work, anytime you need to turn around to get information or communicate with others, with the wheel more convenient to turn around. No wheel, people are prone to turn on the lumbar spine to produce shear stress, injury to the lumbar spine.