“Sitting” has become a normal life of modern people, but long-term sitting has many disadvantages, so how to choose a good seat? Xu Xuemeng, a professor of orthopedics at Guangdong Second Hospital of Traditional Chinese Medicine, believes that from the perspective of orthopedics, it is best to consider these three points for an ideal office chair:
1. The angle and curved surface of the chair back should be adjustable and have good support for the neck, back and waist
The spine of a normal human body has three physiological curvatures. They do not grow in a straight line due to physiological requirements. The thoracic spine is convex, and the cervical and lumbar spine are convex forward. From the side, the spine is like a connection of two Ss. Due to this physiological characteristic, the waist and back cannot be placed on the same plane. Therefore, if you want to achieve a comfortable sitting posture, the design of the chair back should conform to the natural spine curve. It can maintain the lordosis of the cervical and lumbar spine and the kyphosis of the thoracic spine.
Therefore, a properly designed work chair should have the following three supporting points for the human back:
1) There is an adjustable neck pillow at the head and neck to support the lordotic cervical spine;
2) There is an adjustable curved surface on the upper back to support the kyphotic thoracic spine;
3) There is an adjustable lumbar pad at the back waist to support the lordotic lumbar spine.
The comprehensive support in the above three parts can ensure that the user sits upright on the computer chair while maintaining the natural curve of the spine, avoiding the occurrence of spine deformation.
Second, the chair should be adjustable in height
Adjust the height of the seat according to your own height. The thighs are parallel to the ground and the knees bend about 90°. Both feet can step on the ground steadily. At the same time, when operating the computer, the head and neck are on the same vertical line. The height of this chair can be Increase the stability of the body and reduce the degree of spinal involvement.
Third, the chair must have armrests
The armrest of the chair has a supporting effect when standing up, and can share the pressure of the waist.
Xu Xuemeng said that the height of the armrest is also very important, and its height must be able to support both elbows and elbow joints. The armrests of many seats only serve to hold hands.
The base is hard and strong, and does not tilt due to the pressure of the body weight. Generally speaking, the height of the base from the ground is 40~45cm (it is another matter for people who are very tall or very short). This height is basically the length of the calf, and the feet can be naturally placed on the floor when you sit on it.
If the seat base is easy to move and has poor support, the waist muscles will be instinctively tense to keep the upper body stable, and the waist muscles are more likely to strain.