Sitting Posture for Manager's Office Chair

The correct sitting posture for a manager's office chair (executive chair) requires comprehensive adjustments from three aspects: support for various body parts, equipment adjustment, and dynamic management. The specific key points are as follows:

1. Keep feet flat on the ground to avoid knee suspension
When feet are suspended, the knees remain in a "semi-flexed suspended state" for a long time, causing the muscles on the front of the thighs to gradually atrophy due to lack of support, ligaments to loosen, and subsequently leading to an imbalance in knee joint forces, reduced stability, and an increased risk of joint wear. The correct approach is to adjust the chair height so that the knees and hips are on the same horizontal line, with feet naturally placed flat on the ground or footrests, ensuring that the thighs and calves form a physiological bend of 90°-110° to reduce knee pressure.

2. Maintain an upright back and utilize lumbar support
Poor postures such as slouching or arching the back can disrupt the natural physiological curvature of the spine, leading to concentrated pressure on the lumbar intervertebral discs, which may cause lower back pain, leg numbness, or even herniated discs over time. Actively straighten the back to allow the shoulder blades to naturally sink, while activating the lumbar support function of the chair (such as an adjustable lumbar support) and adjusting it to fit the 3rd-5th lumbar vertebrae (the most concave part of the lower back), forming an "S"-shaped curve support to disperse spinal pressure. If the chair lacks a lumbar support, a thin pillow can be placed between the lower back and the chair back for additional support.

3. Adjust the computer screen height to protect the cervical spine
A screen that is too low requires looking down, while a screen that is too high requires looking up, both of which force the cervical spine out of its neutral position and accelerate the degeneration of the cervical intervertebral discs. It is recommended to align the center of the screen with the eyes, which can be achieved by adjusting the height of the monitor stand or using books to elevate it, ensuring that when the gaze is horizontal, the cervical spine is in a naturally slightly forward-flexed state (about 10°-15°), reducing muscle tension and intervertebral disc pressure.

4. Flexibly utilize the chair's adjustment functions
The height, tilt, armrest, and other adjustment functions of the executive chair need to be dynamically adjusted according to the task type:

• Height adjustment: Ensure that after the feet are flat on the ground, the arms naturally hang down with the elbows at a 90°-100° angle, facilitating keyboard and mouse operation;
• Tilt function: During short breaks, recline 15°-20° to relax the back muscles, but maintain lumbar support;
• Armrest adjustment: Adjust the armrest height to be level with the desktop to support the elbows and avoid shoulder suspension.

5. Take regular breaks to counteract the effects of prolonged sitting
Even with correct sitting posture, prolonged static loading can still lead to spinal stiffness and poor blood circulation. It is recommended to get up and move for 1-2 minutes every 30-60 minutes, performing simple stretching exercises such as raising both hands while standing to stretch the spine, bending sideways to relieve lower back muscle tension, or marching in place to promote lower limb blood circulation and reduce the risk of deep vein thrombosis.

By making these adjustments, the risk of injury to muscles, bones, and joints from prolonged sitting can be significantly reduced, enhancing work efficiency and health levels.