Working in an office typically involves spending a great deal of time sitting in an office chair – a position that adds stress to the structures in the spine. Therefore, to avoid developing or compounding back problems, it’s important to have an office chair that’s ergonomic and that supports the lower back and promotes good posture.
Office chair seat height should be easily adjustable. A pneumatic adjustment lever is the easiest way to do this. A seat height that ranges from about 16 to 21 inches off the floor should work for most people. This allows the user to have his or her feet flat on the floor, with thighs horizontal and arms even with the height of the desk.
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SEAT WIDTH and DEPTH:
The seat should have enough width and depth to support any user comfortably. Usually 17-20 inches wide is the standard. The depth (from front to back of the seat) needs to be enough so that the user can sit with his or her back against the backrest of the ergonomic office chair while leaving approximately 2 to 4 inches between the back of the knees and the seat of the chair.
Lower back support in an ergonomic chair is very important. The lumbar spine has an inward curve, and sitting for long periods without support for this curve tends to lead to slouching (which flattens the natural curve) and strains the structures in the lower spine.
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The backrest of an ergonomic office chair should be 12 to 19 inches wide. If the backrest is separate from the seat, it should be adjustable in height and angle.
The material on the office chair seat and back should have enough padding to be comfortable to sit on for extended periods of time. Having a cloth fabric that breathes is preferable to a harder surface.
The backrest should be adjustable and follow the shape of the spine. It should also support the curve in the lower back.
Feet should rest flat on the floor comfortably. If not, adjust the chair height or add a footrest.
Arm rests should be close the body and allow the shoulder to relax.
Office managers should attempt to have their employees try on the chair they plan to purchase before buying it to insure that it fits the employee well. Many office supply companies will bring a variety of chairs to the office so employees can sit in them and decide which one fits them best.
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In a sitting position looking forward, the center of the computer screen is what should be seen.
The back of the chair should come to the middle of the shoulder blades in order to provide adequate support, above the shoulders is even better.
The seat of the chair should be long enough to put two or three finger lengths between it and the knee.
If possible, the cushion should be memory foam. Other cushions wear out quickly and make the chair uncomfortable.
Ergonomics typically play a central role in office chair purchase decisions, and that’s a good thing. Studies show that paying attention to this factor can go a long way toward decreasing repetitive work injuries and even the amount of sick time employees take for head, shoulder, back and arm pain.
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CONTOURING & PADDING:
Contouring and padding in chairs are often the first factors some manufacturers take away when trying to cut costs. This is another area where testing a chair in a showroom can mean the difference between a great purchase or a purchasing mistake.
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