Some seat pans adjust easily for either a forward or backward tilt. The hydraulic seat height adjustment allows the user to adjust the chair so the feet can rest on the floor or footrest and the upper body is properly aligned with the computer monitor, keyboard and mouse. The chair-recline or tilt adjustment changes the angle of the entire seat. Armrests alleviate the pressure on the back but may interfere with lower desks. Adequate lumbar support is the most crucial element of a backrest. As with backrest angle adjustability, a reclined chair transfers some of the upper body weight to the backrest.
Adequate lumbar support in an ergonomic chair is the most crucial element of a backrest. Look for chairs that provide mid-back and upper-back support as well. The seat should always extend at least one inch from either side of the hips for optimum comfort because insufficient hip room can make you sit too far forward and not get enough thigh support.
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Ergonomics is such a growing market that most ergonomic chairs are just a fraction more than there non-ergo counterparts. The main way to know if a product is ergonomic is if it says so. Companies who have energy saver technology advertise it. Ergonomic products will say loud and proud that they are ergonomic. If a product doesn’t openly advertise that it is ergonomic than either it was not designed to be sensitive to ergonomics or it is a cheap knockoff.
Make sure that the front part of the seat should slope down slightly and allow a fist size gap between the back of the knees and the front edge of the seat pan to reduce pressure at the back of the thighs. The tilt mechanism maintains support as you move and recline; it’s best to have your back slightly reclined while you’re seated at your desk. Inadequate lumbar support places too much pressure on the spine.
But how do I know which are the ergonomic ones and which aren’t? This part is easy. Because a lot of research and design go into the development of each ergonomic chair and often they have more parts they tend to cost a little more. Many are turned off by this but it is like buying a cheap mattress. Yes a $500 mattress can be slept on as easy as a $1000 one but your back pays the extra $500 in pain if you buy the cheap mattress.