A chair is to solve the problem of sitting; Ergonomic chair is to solve the problem of sedentary.
Based on the results of the third lumbar intervertebral disc (L1-L5) force findings:
Lying in bed, the force on the lumbar spine is 0.25 time of the standard standing posture, which is the most relaxed and comfortable state of the lumbar spine.
In standard sitting posture, the force on the lumbar spine is 1.5 times that of standard standing posture, and the pelvis is neutral at this time.
Voluntary work, the lumbar spine force for the standard standing posture 1.8 times, when the pelvis tilted forward.
Head down on the table, the lumbar spine force for the standard standing posture 2.7 times, is the most injury to the lumbar spine sitting posture.
The backrest angle is generally between 90~135°. By increasing the angle between the back and the cushion, the pelvis is allowed to tilt back. In addition to the forward support of lumbar pillow to lumbar spine, the spine maintains a normal S-shaped curvature with both forces. In this manner, the force on the lumbar spine is 0.75 times the standing posture, which is less likely to be fatigued.
Backrest and lumbar support is the soul of the ergonomic chairs. 50% of the comfort problem derives from this, the rest 35% from the cushion and 15% from the armrest, headrest, footrest and other sitting experience.
How to choose a right ergonomic chair?
Ergonomic chair is a more personalized product since each person has his or her own height, weight and body proportion. Therefore, only the relatively suitable size can maximize the effect of ergonomics, just like clothes and shoes.
In terms of height, there is limited options for people with smaller size (below 150 cm) or bigger size (above 185 cm). If you failed to make the best choice, your legs might hard to step on the ground, with the headrest on your head and neck stuck in.
As for weight, thin people (below 60 kg) do not suggest choosing the chairs with hard lumbar support. No matter how being adjusted, the waist is choking and uncomfortable. Fatter people (above 90 kg) do not recommend choosing the high elastic mesh chairs. Cushions will be easy to sink, causing poor blood circulation in the legs and easy numbness in the thighs.
People with waist trauma, muscle strain, herniated discs, a chair with sacral support or a good back and cushion linkage would be highly recommended.
Conclusion
The ergonomic chair is an all-round, flexible and adjustable support system. No matter how expensive the ergonomic chair, it can not completely avoid the harm brought by sedentary.
Post time: Dec-02-2022