Correct Sitting Posture for Office Chairs
To reduce physical fatigue and prevent occupational diseases, the following points should be followed for a correct sitting posture in office chairs:
Adjust the seat height The seat height should ensure that both feet are completely flat on the ground, with the thighs and lower legs forming an angle of 95-100 degrees or the knees bent at 90 degrees. If the chair is too high and causes the feet to hang in the air, a footrest should be used; if the chair is too low, it will increase the pressure on the knees, which may lead to joint pain over the long term.
Maintain the correct sitting angle Lean back slightly, with the back and the chair back forming an angle of 100-110 degrees, so that the lower back fits snugly against the chair back. If the chair is equipped with a lumbar support, adjust it to support the natural forward convexity of the lumbar spine (between the third and fifth lumbar vertebrae), with a thickness suitable for maintaining a slight forward convexity of the lower back. If there is no lumbar support, a memory foam cushion or a rolled-up towel can be added to the chair back for additional support.
Provide proper arm support The height of the armrests should allow the forearms to rest comfortably on the armrests or the desktop when the elbows are naturally hanging down, with the upper arms and forearms forming an angle close to 100 degrees. After sitting firmly, fix the elbow joints and slowly raise the hands to the height of the desktop. This position can determine the ideal height of the desk, ensuring that the forearms and wrists are in a straight line to avoid excessive wrist bending that can cause tenosynovitis.
Optimize the screen viewing angle The monitor should be raised so that the top of the screen is level with or slightly lower (10-15 cm) than the eyes, and the distance should be kept at 50-70 cm. The center line of the screen should be aligned with the bridge of the nose to avoid long-term head tilting or looking up, which can lead to cervical lordosis. If using a laptop, it is recommended to connect an external monitor or use a stand to raise the screen.
Regulate foot posture The feet should be completely in contact with the ground, shoulder-width apart, avoiding crossing the legs or sitting with legs crossed, and keeping the ankles at a 90-degree angle. Those who are not tall enough need to use a footrest for support. Women wearing high heels are advised to have flat shoes ready for changing to prevent continuous tension in the Achilles tendon from affecting lower limb blood circulation.
Take regular breaks Even with a correct sitting posture, it is necessary to get up and move around for 1-2 minutes every 30-40 minutes. You can perform micro-movements such as cervical spine extension and scapular retraction, or try hip joint stretching and lower back relaxation exercises to relieve muscle stiffness and prevent the risk of metabolic syndrome caused by prolonged sitting.
Summary: A correct sitting posture requires a combination of seat adjustment, body support, equipment placement, and regular movement to form a dynamic balance. Long-term adherence can significantly reduce the incidence of cervical, lumbar, and joint diseases and improve work efficiency and quality of life.
