Harms of a Too-Low Office Chair
A too-low office chair can cause various physical harms, mainly including lumbar spine damage, poor blood circulation, and abnormal posture.
Firstly, the lumbar spine will be severely compressed. When the chair is too low, the knee position is higher than the hips, causing the lumbar spine to be pressed into an arc shape and the spine to be continuously compressed. This posture can lead to stiffness and soreness in the waist when getting up. Prolonged maintenance of this posture can also cause uneven pressure on the lumbar intervertebral discs, accelerating degenerative changes. If sitting for more than 4 hours a day, muscle strain in the lower back may occur within half a year, and in severe cases, it may even induce lumbar disc herniation or sciatica, accompanied by a persistent feeling of heaviness in the buttocks.
Secondly, blood circulation in the lower limbs will be obstructed. A too-low chair can cause the feet to hang in the air or force the person to stand on tiptoe, with the upper thighs being compressed by the edge of the chair, hindering venous return. This posture can cause blood to accumulate in the lower limbs, not only triggering numbness in the buttocks and legs but also leading to the exudation of tissue fluid and causing lower limb edema. If there is a risk of varicose veins at the same time, the symptoms may further worsen.
Furthermore, abnormal posture will exacerbate the burden on the lumbar spine. To maintain balance, the body will unconsciously lean forward, concentrating the weight of the upper body on the front part of the lumbar spine. At this time, the pressure on the lumbar spine can be more than twice that of the upright position, equivalent to the lumbar spine continuously bearing an additional load. This posture can accelerate the wear and tear of the intervertebral discs and at the same time cause compensatory tension in the neck and shoulder muscles, triggering upper crossed syndrome such as forward head posture and rounded shoulders.
In addition, posterior pelvic tilt will form a vicious cycle. A too-low chair can force the pelvis to rotate backward, causing the physiological curvature of the lumbar spine to straighten. This posture can weaken the stability of the core muscles, making the body more reliant on the lumbar spine joints for weight-bearing and further increasing the risk of injury. Long-term posterior pelvic tilt may also affect the function of pelvic organs, leading to problems such as constipation or difficulty in urination.
To avoid these harms, it is recommended to choose an office chair with adjustable height to ensure that when sitting, the thighs are parallel to the ground, the knees are bent at a 90-degree angle, and the feet are flat on the ground. At the same time, use a lumbar support to support the physiological curvature of the lumbar spine and get up and move around for 5 minutes every hour of sitting to reduce the pressure on the spine.
