High-quality office chairs also have mechanical adjustment options, through which the seat surface dynamically adapts to the movement of the person sitting. With “dynamic sitting” the user changes his position more frequently and his muscles are activated. This prevents a monotonous sitting posture and the resulting tension and pain so it is very important to use ergonomic office chairs.
Rocking mechanism: In chairs with this function, the backrest tilts back when you press your back against it. The seat is rigidly coupled to the backrest and follows the movement. This “tilting” relieves the strain on your intervertebral discs in particular. Most models allow the resistance to be adjusted individually using a rotary knob below the seat.
Synchronous mechanism: Here the backrest also tilts together with the seat when you lean backwards. The chair follows your movements synchronously. The big difference: the backrest and seat are not firmly connected! When you lean back, the angle between your thigh and trunk increases. This enables an effective extension and moves your joints. It also improves blood circulation. Another advantage compared to the rocking mechanism: the spine is supported continuously.
The seat: height & depth
Your ergonomic office chair should be height-adjustable. Most common models have a gas spring to adjust the seat height between 42 and 53 centimetres. When adjusting the sitting position, your feet should be firmly on the floor and your thighs and lower legs should form a right angle to each other.
The seat depth on the chair is the distance between the front edge of the seat and the backrest. As a rule, the seat should be at least 37 centimetres. Many ergonomic computer chairs allow adjustment to the personal leg length. Look for two things:
Use the entire seat area to ensure good contact with the backrest.
There should be about a hand’s breadth of space between the front edge of your seat and the back of your knees. In the best case, the front edge of the seat is rounded or sloping slightly. Both prevent circulatory disorders in the limbs.
Many people recommend a seat width between 40 and 50 centimetres. The standard equipment of ergonomic office swivel chairs nowadays is that you can turn the seat completely horizontally. This property ensures dynamic sitting behaviour.
These are few requirements so that one can after knowing these details because these are very important or else even if you buy chairs with a huge amount of money but still the person using it won’t be happy and relaxed instead he may complain of pains.