How to set up a computer chair

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Depending on how adjustable the computer chair is, will determine how effective the chair will be in complying with the operator’s body shape & posture.

Seat pan tilt. Generally most operators will begin with the seat pan horizontal

to the floor. If the chair allows, tilt seat pan backwards or slightly uphill, so that

front of seat pan is marginally higher than back of seat pan. This will prevent

operator’s buttocks from sliding forward due to the uphill angle of the set pan.

The operator can assume a more consistent posture.

Seat pan height - Adjust the seat pan height so your feet are flat on the floor 

and your knee joints are angled at around ninety degrees. The operator should

sense, at the back of their thigh (hamstring region) a sense of evenness with

no excessive pressure in any particular point.

Backrest height - Needs to be positioned so that the lumbar support section

on the front of the backrest, marries in with the apex of the operators lumbar

curve. Its height dependant, therefore shorter operators will adjust it to a lower

level, whilst taller operators will adjust it to a higher level.

Backrest Reclination angle - Adjust the angle of the backrest to around 100°-110°.

The idea is to lean against the backrest and transfer your upper torso body weight

onto it. This will reduce the weight and therefore pressure applied to the lumbar

region, in particular the discs.

Arm Rest Height - With your elbows at 90 degrees by your waist side, adjust the

armrests so that they just touch the elbow/forearm surface. From here, simply

elevate armrests further by half an inch. This will take pressure away from the

shoulder girdle.

Guard the Chair - Once the chair has been adjusted for your body requirements,

make sure no-one disrupts this positioning.