Office chairs

Many of us are seated for most of our waking hours, whether at home or at work. Although sitting requires less physical effort than standing or walking, it puts a lot of stress on lumbar area. The combined effects of a sedentary lifestyle and a job that requires frequent and prolonged periods spent behind a desk can have a lasting detrimental physical effect and adversely effect productivity. Some 80% of the population suffer from back pain and back complaints are a major reason for absenteeism.

 Selecting a chair
The selection of a suitable office chair is a first step to preventing health problems and there are some features that are essential for a good chair regardless of how you intend to use it.

Fundamental features
Seat
- the seat height should be adjustable
- the range of adjustment should suit all those who will use the chair
- the seat should not put pressure on the back of your thighs or knees
- the seat should have a “waterfall” front edge sloping to the floor
- the seat should be the correct depth for all users

Backrest
- the backrest should be adjustable for both height and rake
- the backrest should be shaped to support the lower back

Base
- the base should be 5 point for stability
- the base should have castors to suit the type of flooring

 Armrests
- armrests are in no way compulsory
- armrests should be at elbow height such that with your upper arms vertical and your forearms at about 90 degrees they give comfortable support
- armrests should not interfere with free movement

Advanced features
Seat
- adjustable seat tilt angle
- adjustable seat depth

Back
- adjustable lumbar support
- synchronic movement (normally 2:1 ratio) of the back and seat angle. This ensures correct posture and can be either locked in position or left freefloating. Tension control adjusts to user’s weight.

Armrests
- height adjustable armrests
- width adjustable armrests to accommodate differing staff dimensions
- multi-function arms that will swivel and slide backwards and forwards

General
- all major controls easily accessible from a sitting position
- Remember that personal preference is essential to the process of selecting a chair and the person who will use the chair should try it out in a real work situation. 

adjusting your chair