What Makes a Chair Ergonomic? -The Basic Requirements
The bad postures and excessive sedentary lifestyle, to which we are exposed during the eight hours that our workday in the office lasts, can, without us noticing, be damaging our health.
Neck and shoulders, lumbar, dorsal and head are the most punished parts of our body fruit of the way we sit at the computer, bad position of the neck and head, as well as the arms and wrists while typing.
When we stay in a wrong position for a long time, the spine loses its natural alignment, causing pain, fatigue and muscle tension.
According to Ofita, postural hygiene and ergonomics are effective in preventing these ailments. The first thing we must do is replace the static posture with that of sitting in active movement. For this, the backrest must allow some flexibility, moving in small angles on a fixed position. In addition, it will be important that we change positions frequently, avoid partial turns (it is better to turn the whole body at the same time) and get up and walk a little every 45 minutes.
REQUIREMENTS FOR A HEALTHY CHAIR, ACCORDING TO OFITA
The chair is one of the most important office elements: it forces us to maintain a correct posture and that circulation is adequate. Therefore, it is very important that you respect the normal curvatures of the back and adapt to the person.
The chair must adapt to its user
It must be fully adjustable: allowing the height adjustment of the seat, the backrest (to allow correct lumbar support) and the armrests. It must also allow mobility and rotation. The height of the seat must allow the support of the feet on the floor, without appreciating excessive pressure on the lower part of the thighs, near the knees.
The backrest must ensure that the backrests correctly
The support should allow us to adopt an upright position, helping us to support the trunk in its entirety and extremely important, also, is that we support the lumbar area.
Thanks to the research effort carried out by leading companies, increasingly innovative solutions are being developed to solve this problem. For example, in the Iroha model of Ofita, the arms and the lumbar support form a joint element, so that when the user positions the correct height of the arms, the lumbar support is placed in its optimal solution.
On the other hand, the backrest should not be too wide in its upper part so that it does not reduce mobility to the arms. It must have a certain curvature, seen laterally, to adapt to the shape of the back.
It is also recommended that the backrest of the ergonomic chair is adjusted in height or, failing that, the regulation of the most protruding area of the lumbar curvature of the backrest so that the height of the lumbar support varies between a range of at least 6 cm.
The adjustment of the seat depth is important so that people of different stature can rest comfortably on the backrest.
The chair must be safe
The work chairs must be revolving and their bases must be equipped with 5 radios to avoid overturning. There should be no risk in any of the "limit" positions that the user can adopt: from the sitting position on the front edge of the seat, with the body tilted forward, to the position of maximum backward inclination of the backrest.
A random displacement of the chair at the time when the user is going to sit down could be dangerous; To avoid this there are "self-braking" wheel systems that do not advance when there is nobody sitting in them.
The chair must allow a dynamic sitting position
It must adapt to the movements of the user.
The armrests must be adjustable
The armrests are convenient to give support and rest to the arms and forearms; Good support will reduce the feeling of fatigue in the cervical area.
Its length should be somewhat less than that of the seat so that it does not prevent us from bringing the chair closer to the table. In addition, they should be thick and should not have sharp edges.
It is very interesting that the width of the arm is also adjustable and that the arms can rotate so that the user can be placed in different positions and it is easier to perform any activity comfortably.
It does not have to be excessively soft. The front edges must have a suitable curvature so as not to press the lower part of the leg and not hinder the circulation of the blood.