The sitting height of the furniture refers to the vertical distance between the sitting front and the ground, that is, the height of the sitting front edge. Sitting height is one of the important factors affecting the comfort of sitting posture, and it is also the benchmark for determining a series of scales such as backrest height, armrest height and table height.

The height of the sitting surface is inappropriate, leading to unscientific sitting posture, which is easy to cause fatigue in the waist of the human body. If the sitting height is too high, the feet are suspended, the soft tissue of the front part of the thigh near the knee socket is compressed, the blood circulation is poor, and the tendons are swollen and numb.

Sit too low, knee arch, thigh can not touch the chair surface can not provide support, body pressure is too concentrated in the ischial tubercle, a long time will produce pain; At the same time, the human body forms a forward bending posture, which will increase the load on the back muscles and cause difficulties when getting up, especially for the elderly.

Proper sitting height can make the human body reach a relaxed and natural state. The national standard GBT326 stipulates that the seating height of the general seat is 400~440mm, and the seating height requirements are not the same for different seats. Generally, the height of the work chair is higher than that of the rest chair, and it is designed to adjust the height, and the adjustment range is 50~460mm to suit the needs of people with different heights.

The height of the rest chair (such as sofa, recliner, etc.) can be slightly lower so that the legs can be extended forward, leaning behind the back, which is conducive to the natural state of the spine and relax the muscles, and also contributes to the stability of the body. The sitting height of the sofa is generally 360~420mm; Stool because there is no backrest, so the stability of the lumbar spine can only be adjusted by the height of the stool, when the height of the stool is 400mm, the maximum degree of muscle activity in the back, that is, the most prone to fatigue, so the height of the stool should be slightly higher or slightly lower than this value.