Office Chair and Stool Adjustment

Adjusting office chairs and stools should be carried out in terms of seat height, sitting posture angle, armrest height, monitor height, and regular activities to ensure comfort and health.

1. Seat Height Adjustment
   Locate the hand control device and adjust the height by pulling up the lever or turning the knob. For some pneumatic models, repeated up-and-down lever movements can achieve height adjustment. When adjusting, ensure that both feet are flat on the ground, with the thighs and lower legs forming an angle of 95 to 100 degrees, distributing body weight evenly and avoiding excessive pressure on the buttocks and thighs. If the chair is too high and causes the feet to hang in the air, use a footrest; if it is too low, it increases pressure on the knee joints. Adjustment can also be made from a standing position, positioning the front of the chair below the knees. When working on a computer, if the monitor height is not adjustable, adjust the seat so that the eyes are level with the screen; keep the elbows level with the desktop when working at a desk; and ensure that both feet are flat on the floor during long periods of sitting.

2. Sitting Posture Angle Adjustment
   Recline slightly to an angle of 100 to 110 degrees, which can effectively reduce lumbar spine pressure. The key is to have the back, especially the lower back, in contact with the chair back. If the chair is equipped with a lumbar support, adjust it to support the natural curve of the lumbar spine and avoid the lower back hanging in the air.

3. Armrest Height Adjustment
   The armrest height should allow the forearms to rest easily on the armrests or desktop when the elbows are naturally hanging down, with the upper arms and forearms forming an angle of approximately 100 degrees to reduce shoulder strain. If arm support is not required, the armrests can be removed or lowered to avoid obstructing the knees from sliding under the desk.

4. Monitor Height Adjustment
   Elevate the monitor so that the line of sight is level with the top edge of the screen, forcing the spine to stretch naturally and avoiding a three- to five-fold increase in neck pressure due to forward head posture.

5. Regular Activities
   Every 30 minutes, use the chair to perform simple activities such as hip joint stretching (sitting on the edge of the chair, feet apart, crossing the ankles and leaning forward), lower back release (twisting the body while holding onto the chair back with one side), and shoulder opening exercises (sitting upright and raising the arms or holding onto the chair back with both hands behind and stretching) to relieve fatigue from prolonged sitting.