The standard chair of a healthy chair is too soft to hurt
The hardness of the chair is also very important, the body's anatomy and physiology knowledge tells us that when sitting, the human lumbar load is larger than standing, the spine and pelvis should be vertical, the vertical fixed position by the muscles on both sides of the spine To maintain. If the position of the spine and pelvis is long-term offset, the force of the system will be biased, which easily lead to back muscle spasms, and even bone damage, over time, the user will feel back pain.
Too soft chair easy to make the user song body, muscle and bone weakness of the body, resulting in the phenomenon of back pain. In this case, the user should consider replacing the chair, to choose a hard chair, such as the continued use of the original chair, then sit down when the hip as far as possible, so that the back close to the back of the chair, rather than Floating, but also can be considered to add a waist to his waist, as a support.
The height of the standard 2 seats for healthy seats is not less than 39cm
A good seat design should cause the user's upper body's center of gravity to fall on the bones of the buttocks and set the height of the seat with the reference point of the person's sitting (sagittal node). Normally, the height of the seat is 39cm ~ 42cm, because the height of the seat if less than 39cm, the user's knee will be arched, resulting in discomfort caused; when the height of the seat is greater than 50cm, the user sit down, the body pressure will be dispersed To the thigh part, so that the user's thigh medial pressure, serious will lead to lower leg swelling.
Healthy seats are standard 3 back
Good chair back is also very particular about. In general, for a chair, the back is not a must-exist part, if the user's range of activities, want to be able to flexibly turn, pick and place items, you can choose no chair back.
When the user is working for a long time, the backrest chair makes the user feel more comfortable. In general, the height of the backrest is not fixed, depending on the user's habits and feelings, for the work chair, as long as the user does not affect the activities of low backrest can only reach the user's first second lumbar , The height of the user to the shoulder blade, neck; but for casual chairs, the height of the back to the neck is appropriate, so it is good to support the user's head, to facilitate the user to rest.
The standard seat of the healthy seat can not be too narrow
When we want to choose a good fit their own chair, we have to chair the seat, backrest, handrails and other aspects to consider. The width, depth, inclination, backrest curvature of the seat surface are required to conform to the scale of the body and the movement of each part.
Seat height, too high, too low will make the user's body hurt. In the choice of seats, in addition to considering the height of the seat surface, it should also be noted that a good chair, the seat surface width must be just the right seat surface is too narrow, will make the user feel discomfort, because the body Both sides of the muscles will be squeezed; and the seat is too wide, then the user's double hip will certainly open out, so the user's latissimus dorsi and shoulder deltoid muscle tendon tissue will be stretched, Sitting so long, will make the user feel tired.
The standard seat of the healthy seat is tilted by 110 degrees
The inclination of the backrest is also learned. In general, the backrest tilt angle is gradually increased, and its support for the human body at the same time gradually upward shift. In general, the angle between the back and the thigh is about 100 to 110 degrees, the trunk is too upright sitting but easy to produce pressure on the spine.